FullDescription:Telecommunication

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ATN Internet

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Term ATN Internet
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aeronautical telecommunication network (ATN)

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Abbreviation

Definition

An implementation of the ISO OSI network layer services and protocols for support of interprocess data communication between aeronautical host computers. It is defined to be the collection of the connected internetwork routers and subnetworks that conform to ATN internetwork requirements.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

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ATN host computer

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Term ATN host computer
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Aeronautical telecommunication network host computer

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Broader term

aeronautical telecommunication network (ATN)

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Abbreviation

Definition

a civil aeronautical computer system which contains one or more end user applications and that communicates using the ATN internet.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

Note

In OSI terms, it denotes an End System. An ATN Host Computer may also implement the upper layers necessary to support the Systems Management Agent and Systems Management Manager and upper layer protocols as specified for the supported end-user applications.

ATN island

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Term ATN island
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ATN island bridge

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aeronautical telecommunication network (ATN)

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Abbreviation

Definition

a Routing Domain Confederation (RDC) comprising CAA-operated ATN RDs within a geographical region, and may include associated ATN service providers, or an RDC comprising Aeronautical Industry members which are users of communications services of a single Aeronautical Industry Service Provider, or more than one such provider providing services in combination with each other.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

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ATN island backbone

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aeronautical telecommunication network (ATN)

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Abbreviation

Definition

An ATN backbone is an Routing Domain Confederation (RDC) comprising a subset of Transit Routing Domains within an ATN Island which provide general connectivity.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

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ATN island bridge

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Term ATN island bridge
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aeronautical telecommunication network (ATN)

ATN island

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Abbreviation

Definition

A bridge between two ATN Islands is a communications link between backbones over a suitable subnetwork.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

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ATN router

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Term ATN router
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aeronautical telecommunication network (ATN)

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Abbreviation

Definition

The communication element that manages the relaying and routing of data while in transit from an originating ATN host computer to a destination ATN host computer.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

Note

In ISO terms, an ATN router comprises an OSI intermediate system and an end system supporting a systems management agent.

ATN routing domain confederation

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Term ATN routing domain confederation
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routing domain

Broader term

aeronautical telecommunication network (ATN)

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Abbreviation

Definition

the set of interconnected routing domains that together form the ATN.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

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ATS communication

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Term ATS communication
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air traffic services communication

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Abbreviation

ATSC

Definition

Communication related to air traffic services including air traffic control, aeronautical and meteorological information, position reporting and services related to safety and regularity of flight. This communication involves one or more air traffic service administrations. This term is used for purposes of address administration.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications ) as per Amdt 73 (05/11/1998).

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ATS direct speech circuit

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Term ATS direct speech circuit
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air traffic service direct speech circuit

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Air Traffic Service (ATS)

aeronautical fixed service (AFS)

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Abbreviation

Definition

An aeronautical fixed service (AFS) telephone circuit, for direct exchange of information between air traffic services (ATS) units.

Definition Source

ICAO/OACI, "International Civil Aviation Vocabulary", Doc. 9713, Vol.1, 1998

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Abstract syntax

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abstract syntax notation one

Abbreviation

Definition

The specification of Application Layer data or application-protocol-control-information by using notation rules which are independent of the encoding technique used to represent them.

Definition Source

International Telecommunications Union (ITU), terminology tool Termite 6L - Terminology of Telecommunications - V.7, official terminology

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Address domain

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Term address domain
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addressing domain

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Abbreviation

Definition

A set of address formats and values administered by a single address authority.

Definition Source

ICAO, DOC 9739 Comprehensive Aeronautical Telecommunication Network (ATN) Manual 2000, 1st ed., p. I-5-2

Note

Under the ISO plan, any address authority may define subdomains within its own domain and delegate authority within those sub-domains.

Administrative domain

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Term administrative domain
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Abbreviation

Definition

A collection of end systems, intermediate systems and subnetworks operated by a single organization or administrative authority.

Definition Source

ICAO (1999)DOC 9705 Manual of Technical Provisions for the Aeronautical Telecommunication Network (ATN) 1999, 2nd ed., p. 1-2

Note

An administrative domain may be internally divided into one or more routing domains.

Aeronautical Mobile Communications Panel

Link Semantic Value
Term Aeronautical Mobile Communications Panel
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Abbreviation

AMCP

Definition

ICAO panel "established on 19 March 1991 (ANC 126-16) as a result of the need to address activities on VHF air-ground communication systems."

Definition Source

ICAO (2002) AN-WP/7767 Proposal for the Consolidation of the Work of the Aeronautical Mobile Communications Panel (AMCP), the Aeronautical Telecommunication Network Panel (ATNP) and the ATS Voice Switching and Signalling Study Group (AVSSG)

Note

The work programme of AMCP was further expanded on 20 June 1996 (ANC 142-13) with the inclusion of work on high frequency data link (HFDL) and again on 19 March 1998 (ANC 147-13) with the inclusion of activities related to the protection of aeronautical spectrum, in particular, in relation to the work of the International Telecommunication Union (ITU). (...)Further amendments to the work programme included the development of additional material on aeronautical mobile-satellite service (AMSS) (ANC 151-9) and the updating of the detailed technical specifications for air-ground data links (ANC 154-11).

Aeronautical administrative communications

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Term aeronautical administrative communications
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aeronautical administrative messages

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Abbreviation

AAC

Definition

Communications necessary for the exchange of aeronautical administrative messages.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 2007, Amdt. 83 (20/07/2008)

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Aeronautical administrative messages

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Term aeronautical administrative messages
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Abbreviation

Definition

Messages regarding the operation or maintenance of facilities provided for the safety or regularity of aircraft operation.

Messages concerning the functioning of the ATN and messages exchanged between government civil aviation authorities relating to aeronautical services.

Definition Source

ICAO, DOC 9705 Manual of Technical Provisions for the Aeronautical Telecommunication Network (ATN) 1999, 2nd ed., p. 1-3

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Aeronautical fixed circuit

Link Semantic Value
Term aeronautical fixed circuit
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aeronautical fixed telecommunication network

Broader term

aeronautical fixed service (AFS)

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Abbreviation

Definition

A circuit forming part of the aeronautical fixed service (AFS).

Definition Source

ICAO (1996) Official definition, ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status

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Aeronautical fixed service

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Term aeronautical fixed service
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Abbreviation

AFS

Definition

A telecommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficient and economical operation of air services.

Definition Source

ICAO (2010) Official definition, ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003); ANNEX 3 Meteorological Service for International Air Navigation 2010; ANNEX 11 Air Traffic Services 2001

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Aeronautical fixed station

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Term aeronautical fixed station
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aeronautical fixed service

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Abbreviation

Definition

A station in the aeronautical fixed service.

Definition Source

ICAO, Official definition,

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

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Aeronautical fixed telecommunication network

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Term aeronautical fixed telecommunication network
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aeronautical fixed circuit

aeronautical fixed service

aeronautical fixed telecommunication network circuit

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Abbreviation

AFTN

Definition

A worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics.

Definition Source

ICAO (2010) Official definition, ANNEX 3 Meteorological Service for International Air Navigation 2010; ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status

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Aeronautical fixed telecommunication network circuit

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Term aeronautical fixed telecommunication network circuit
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Broader term

aeronautical fixed telecommunication network

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Abbreviation

Definition

A circuit forming part of the aeronautical fixed telecommunication network (AFTN).

Definition Source

ICAO, Official definition added to Annex 10/II (Aeronautical Telecommunications) by Amdt 71 (07/11/1996).

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Aeronautical industry service communication

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Term aeronautical industry service communication
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Abbreviation

AISC

AINSC

Definition

Communication related to aeronautical industry services including aeronautical operational control communication, aeronautical administrative communication, and aeronautical passenger communication.

Definition Source

ICAO (1999) DOC 9705 Manual of Technical Provisions for the Aeronautical Telecommunication Network (ATN) 1999, 2nd ed., p. 1-3

Note

This communication involves one or more aeronautical industry service administrations. This term is used for purposes of address administration.

Aeronautical mobile service

Link Semantic Value
Term aeronautical mobile service
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aeronautical mobile-satellite service (AMSS)

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Abbreviation

AMS

Definition

A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate; emergency position-indicating radio beacon stations may also participate in this service on designated distress and emergency frequencies.

Definition Source

ICAO Official definition,

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003);

ANNEX 3 Meteorological Service for International Air Navigation 2010;

ANNEX 11 Air Traffic Services 2001

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Aeronautical mobile-satellite service

Link Semantic Value
Term aeronautical mobile-satellite service
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aeronautical mobile satellite service

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Abbreviation

AMSS

Definition

A mobile-satellite service in which mobile earth stations are located on board aircraft; survival craft stations and emergency position-indicating radiobeacon stations may also participate in this service.

Definition Source

ICAO, Official definition, AN 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status

C-WP/11519 Adoption of Amendment 76 to Annex 10 — Aeronautical Telecommunications 2001/02/13, App. B, p. B-3 (amdt 76-An10/II)

Note

The AMSS comprises satellites, aeronautical earth stations (AESs), ground earth stations (GESs) and associated ground facilities such as a network coordination center. It uses the satellite subnetwork to provide aeronautical communication services between aircraft and ground users. Technical requirements for the AMSS are contained in Annex 10, Volume III, Part I, Chapter 4. The ATN supports the packet-mode data exchange provided by the AMSS.

Note Source

ICAO, DOC 9705 Manual of Technical Provisions for the Aeronautical Telecommunication Network (ATN) 1999, 2nd ed., p. 1-3

Aeronautical operational control

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Term aeronautical operational control
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operational control

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Abbreviation

AOC

Definition

Communication required for the exercise of authority over the initiation, continuation, diversion or termination of flight for safety, regularity and efficiency reasons.

Definition Source

ICAO (2008) Official definition, AN 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

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Aeronautical passenger communication

Link Semantic Value
Term aeronautical passenger communication
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Abbreviation

APC

Definition

Communication relating to the non-safety voice and data services to passengers and crew members for personal communication.

Definition Source

ICAO (1998) Official definition added to An 10/III by Amdt 73, AN 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

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Aeronautical station

Link Semantic Value
Term aeronautical station
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aeronautical telecommunication station

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Abbreviation

Definition

A land station in the aeronautical mobile service. In certain instances, an aeronautical station may be located, for example, on board ship or on a platform at sea.

Definition Source

ICAO (2005) Official definition,

ANNEX 2 Rules of the Air 2005,

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

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Aeronautical telecommunication network

Link Semantic Value
Term aeronautical telecommunication network
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SESAR

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Abbreviation

ATN

Definition

An internetwork architecture that allows ground, air-ground and avionic data subnetworks to interoperate by adopting common interface services and protocols based on the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) reference model.

Definition Source

ICAO Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., Amdt 76 (01/11/2001), p. 1

Note

Amendment:

A global internetwork architecture that allows ground, air-ground and avionic data subnetworks to exchange digital data for the safety of air navigation and for the regular, efficient and economic operation of air traffic services.

Source: ICAO, AN-WP/8297 Approval of Draft Report to Council on Amendment 83 to Annex 10 24/1/08, p. B-2

Lexicon Release

Lexicon Release 2015.2

Aeronautical telecommunication station

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Term aeronautical telecommunication station
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Abbreviation

Definition

A station in the aeronautical telecommunication service.

Definition Source

ICAO, Official definition

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

ANNEX 3 Meteorological Service for International Air Navigation 2010

ANNEX 11 Air Traffic Services 2001

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Air traffic services communications administrative domain

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Term Air traffic services communications administrative domain
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ATSC administrative domain

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aeronautical telecommunication network (ATN)

Broader term

administrative domain

Narrower term


Abbreviation

Definition

an ATN Administrative Domain owned and/or administered by an air traffic services organisation.

Definition Source

EUROCONTROL (2004) EATM glossary, June 2004

Note

Air traffic services facilities notification function

Link Semantic Value
Term Air traffic services facilities notification function
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ATS facilities notification function

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Abbreviation

Definition

An ARINC 622 function to enable aircraft to establish data link communications with Air Traffic Control Facilities.

Definition Source

EUROCONTROL (2004) EATM glossary, June 2004

Note

ARINC = Aeronautical Radio, Inc.

Air-ground communication

Link Semantic Value
Term air-ground communication
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Abbreviation

Definition

Two-way communication between aircraft and stations or locations on the surface of the earth.

Definition Source

ICAO, Official definition

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

ANNEX 11 Air Traffic Services 2001

Note

To be distinguished from air-to-ground communication !

Air-ground control radio station

Link Semantic Value
Term air-ground control radio station
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aeronautical telecommunication station

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Narrower term


Abbreviation

Definition

An aeronautical telecommunication station having primary responsibility for handling communications pertaining to the operation and control of aircraft in a given area.

Definition Source

ICAO, Official definition

ANNEX 2 Rules of the Air 2005

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

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Air-to-ground communication

Link Semantic Value
Term air-to-ground communication
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Abbreviation

Definition

One-way communication from aircraft to stations or locations on the surface of the earth.

Definition Source

ICAO, Official definition,

PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

Note

To be distinguished from air-ground communication !

Aircraft call sign

Link Semantic Value
Term aircraft call sign
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Abbreviation

Definition

A group of alphanumeric characters used to identify an aircraft in air-ground communication.

Definition Source

ICAO (1984) DOC 9426 Air Traffic Services Planning Manual 1984, p. V-1-1-2

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Aircraft data link processor

Link Semantic Value
Term aircraft data link processor
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airborne data link processor

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Abbreviation

ADLP

Definition

An aircraft-resident processor that is specific to a particular air-ground data link (e.g. Mode S) and which provides channel management, and segments and/or reassembles messages for transfer. It is connected to one side of aircraft elements common to all data link systems and on the other side to the air-ground link itself.

Definition Source

ICAO Official definition added to An 10/III by Amdt 71 (7/11/1996) and modified by Amdt 77 (28/11/2002)

AN 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., p. 5-1

Note

Aircraft earth station

Link Semantic Value
Term aircraft earth station
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airborne earth station

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ground earth station (GES)

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Abbreviation

AES

Definition

A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications ) by Amdt 70 (9/11/1995)

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Allocation

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Term allocation
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Abbreviation

Definition

"Distribution of frequencies, SSR Codes, etc. to a State, unit or service. Distribution of 24-bit aircraft addresses to a State or common mark registering authority."

Definition Source

ICAO (2007) Official definition (PANS-RAC)

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Almanac data

Link Semantic Value
Term almanac data
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Abbreviation

Definition

"A set of parameters similar to the more precise ephemeris data, used for approximating the GPS satellite orbits."

Definition Source

EUROCONTROL EATM Glossary 2004

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Along-track error

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Term along-track error
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Abbreviation

ATRK

Definition

A fix error along the flight track resulting from the total error contributions.

Definition Source

ICAO - GNSSP/2-WP/87 (Version 4.0) - p.1A-42

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Amplitude modulation

Link Semantic Value
Term amplitude modulation
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Abbreviation

Definition

A form of modulation in which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal.

Definition Source

International Telecommunication Union (ITU), doc. Recommendation UIT-R REC-F.1610 -0 (2003) - õ2.8 Table 1

Note

Analogue-to-digital converter

Link Semantic Value
Term analogue-to-digital converter
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analogue to digital converter

analog/digital converter

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Abbreviation

ADC

Definition

"device for converting analog output into discrete digital data according to specified code of resolution"

Definition Source

Jane's Aerospace Dictionary, 3. Ed. 1988

Note

"also called digitiser and, esp for linear and rotary movement, encoder"

Antenna elevation

Link Semantic Value
Term antenna elevation
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antenna elevation tilt

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Distance Measuring Equipment Antenna Elevation

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Abbreviation

Definition

An angle between the direction of maximum gain of the antenna and the tangent to the surface of the earth. A distinction is sometimes made between electronic (radio signal) and mechanical tilt, especially for SSR LVA antennas. In this case the mechanical tilt may be zero while the antenna is radiating at the electronic tilt of 3°.

Definition Source

ICAO (2004) DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xi)

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Application Service Element

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Term Application Service Element
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application

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Abbreviation

ASE

Definition

The element in the communication system which executes the application specific protocol. In other words, it processes the application specific service primitive sequencing actions, message creation, timer management, error and exception handling. The application’s ASE interfaces only with the application’s CF.

Definition Source

ICAO (1999) Manual of Technical Provisions for the Aeronautical Telecommunication Network (ATN)

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Application entity

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Term application entity
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application process

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Abbreviation

AE

Definition

Part of an application process which is concerned with communications within the OSI environment. The aspects of an application process which need to be taken into account for the purposes of OSI are represented by one or more AEs.

Definition Source

ICAO Official definition, Annex 10

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Application layer

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Term application layer
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application

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Abbreviation

Definition

The layer of the OSI reference model that controls application user access to the communication system.

Definition Source

ICAO Doc 9578-AN/935 1st edition - 1991 "Manual of the Aeronautical Telecommunication Network (ATN)"

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Application process

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Term application process
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application entity

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Abbreviation

Definition

A set of resources, including processing resources, within a real open system which may be used to perform a particular information processing activity.

Definition Source

ICAO (1999) AERONAUTICAL TELECOMMUNICATIONS NETWORK PANEL(ATNP) WORKING GROUP 3 - APPLICATIONS AND UPPER LAYERS, Honolulu, 19 January 99 – 22 January 1999 Agenda Item 10 : Any Other Business, Draft 0.2 20/01/99

Note

Area navigation (RNAV) specification

Link Semantic Value
Term area navigation (RNAV) specification
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required navigation performance (RNP) specification

area navigation

Broader term

navigation specification

Narrower term


Abbreviation

Definition

A navigation specification based on area navigation that does not include the requirement for performance monitoring and alerting, designated by the prefix RNAV, e.g. RNAV 5, RNAV 1.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Communications - Radio Navigation Aids

Note

Association control service element

Link Semantic Value
Term association control service element
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Abbreviation

ACSE

Definition

"the common mechanism in the application layer structure (ALS) for establishing and releasing application service object (ASO) associations".

Definition Source

ICAO (1999) Doc 9705, 1999, 2nd ed., p. 1-6

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Asynchronous Transfer Mode

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Term Asynchronous Transfer Mode
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Abbreviation

ATM

Definition

A protocol for the transmission of a variety of digital signals using uniform 53 byte cells.

Definition Source

International Telecommunication Union (ITU) Official definition , RECOMMENDATION ITU-R F.1499 RADIO TRANSMISSION SYSTEMS FOR FIXED BROADBAND WIRELESS ACCESS BASED ON CABLE MODEM STANDARDS (2000)

Note

Automatic direction finder

Link Semantic Value
Term automatic direction finder
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Non-Directional Radio Beacon (NDB)

Magnetic Bearing

Broader term


Narrower term


Abbreviation

ADF

Definition

An aircraft radio navigation system which senses and indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. Direction is indicated to the pilot as a magnetic bearing or as a relative bearing to the longitudinal axis of the aircraft depending on the type of indicator installed in the aircraft. In certain applications, such as military, ADF operations may be based on airborne and ground transmitters in the VHF/UHF frequency spectrum.

Definition Source

FAA (2010) Pilot/Controller Glossary [1]

Note

Automatic terminal information service

Link Semantic Value
Term automatic terminal information service
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

data link-automatic terminal information service (D-ATIS)

Broader term


Narrower term


Abbreviation

ATIS

Definition

The automatic provision of current, routine information to arriving and departing aircraft throughout 24 hours or a specified portion thereof:

Data link-automatic terminal information service (D-ATIS). The provision of ATIS via data link.

Voice-automatic terminal information service (Voice-ATIS). The provision of ATIS by means of continuous and repetitive voice broadcasts.

Definition Source

ICAO, Official definition,

ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., Amdt 74, p. 4

ANNEX 11 Air Traffic Services 2001, 13th ed., Chap. 1

PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed., Chap. 1

Note

Aviation VHF packet communications

Link Semantic Value
Term aviation VHF packet communications
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

AVPAC

Definition

a bit-oriented VHF air-ground data link which will provide the functionality, capacity, data integrity and system efficiencies that the aviation industry requires for future Air Traffic Services (ATS) and the current and future Airline Operational Communications (AOC) data communications. The AVPAC protocols are based on the ATN architecture and address the OSI lower layers protocols specific to the VHF sub network.

Definition Source

EUROCONTROL (2004) EATM glossary

Note

Aviation binary phase shift keying

Link Semantic Value
Term aviation binary phase shift keying
Status


Mandatory for


Contexts


Categories


Synonyms

aviation-BPSK

Related entries

Aeronautical mobile-satellite service (AMSS)

aviation quadrature phase shift keying (A-QPSK)

Broader term


Narrower term


Abbreviation

A-BPSK

Definition

The particular form of binary phase shift keyed modulation which is used in AMSS for channel rates of 2.4, 1.2 and 0.6 kbits/s. A-BPSK is a modulation technique which maps a '0' to a phase shift of -90° and '1' to a phase shift of +90°. The phase-encoded A-BPSK data stream is then filtered with a filter which satisfies the amplitude and phase versus frequency limits defined by Tables A1-1 and A1-2 in Appendix 1 to Chapter 4 [of An 10/III].

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Aviation quadrature phase shift keying

Link Semantic Value
Term aviation quadrature phase shift keying
Status


Mandatory for


Contexts


Categories


Synonyms

aviation-QPSK

Related entries

aviation binary phase shift keying

Broader term


Narrower term


Abbreviation

A-QPSK

Definition

The particular form of offset quaternary phase shift keyed modulation which is used in AMSS for channel rates greater than 2 400 bits/s. A-QPSK is a modulation technique which maps a 'O' into a 0 degrees and '1' into 180 degrees, or '0' into 90 degrees and '1' into 270 degrees, alternating between the two options on successive bits. The encoded A-QPSK data stream is then filtered such that the modulated spectrum meets the amplitude mask of Table A1-3 and the phase mask defined in Table A1-2 in appendix 1 to Chapter 4 [of Annex 10/III].

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Azimuth change pulses

Link Semantic Value
Term Azimuth change pulses
Status


Mandatory for


Contexts


Categories


Synonyms

Azimuth count pulses

Related entries


Broader term


Narrower term


Abbreviation

Definition

The output pulses of the incremental azimuth measuring device fitted to the radar antenna turning platform (turning gear).

Definition Source

EUROCONTROL, SASS-C Glossary

Note

The encoding device may give its output in serial or parallel form, but typically provides 4096 pulses (12 bit encoding), 16 384 pulses (14 bit encoding) or 65 536 pulses (16 bit encoding) in serial form per 360° of azimuth rotation.

Azimuth extension

Link Semantic Value
Term '
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Azimuth change pulses (ACP)

Broader term


Narrower term


Abbreviation

Definition

The azimuth increment, often expressed as a number of ACPs, from detection of the leading edge of a radar plot to detection of the trailing edge of that plot, in a digital plot extractor system.

Definition Source

EUROCONTROL, SASS-C Glossary

Note

Back course

Link Semantic Value
Term back course
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

front course sector

back course sector

Broader term


Narrower term


Abbreviation

Definition

The course line along the extended centerline of a runway in the opposite direction to the front course, or the localizer course for an ILS (instrument landing system). For an aircraft to approach the instrument runway from the end on which the localizer antenna is installed, the back course must be flown.

Definition Source

An Illustrated Dictionary of Aviation, edited by Bharat Kumar, McGraw-Hill Companies, Inc.

Note

A localizer back course is shown as on aeronautical charts. (same source)

Back course sector

Link Semantic Value
Term back course sector
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

back course

front course sector

Broader term


Narrower term


Abbreviation

Definition

The course sector which is situated on the opposite side of the localizer from the runway.

Definition Source

ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids 1996, 5th ed., Amdt. 74, p. 5

Note

Back lobe

Link Semantic Value
Term back lobe
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A lobe of radiated energy to the rear of an antenna (180° in azimuth with respect to the main lobe).

Definition Source

EUROCONTROL (1997) RADAR SENSOR PERFORMANCE ANALYSIS, doc. SUR.ET1.ST03.1000-STD-01-01, Ed.0.1

Note

Background noise

Link Semantic Value
Term background noise
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

The combined noise present in a measurement system from sources other than the test aircraft, which can influence or obscure the aircraft noise levels being measured.

Definition Source

ICAO (2005) Official definition, ANNEX 16/I Environmental Protection — Aircraft Noise 2005, 4th ed., App 2-3 (3.1)

Note

Typical elements of background noise include (but are not limited to): ambient noise from sources around the microphone site; thermal electrical noise generated by components in the measurement system; magnetic flux noise (“tape hiss”) from analog tape recorders; and digitization noise caused by quantization error in digital converters. Some elements of background noise, such as digitization noise, can obscure the aircraft noise signal, while others, such as ambient noise, can also contribute energy to the measured aircraft noise signal.

Bandpass filter

Link Semantic Value
Term bandpass filter
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

bandwidth

Broader term


Narrower term


Abbreviation

Definition

A filter designed to transmit a range of frequencies (the bandwidth) between two cutoff frequencies and to reject frequencies outside that range.

Definition Source

A Dictionary of Astronomy (Ian Ripath) 1997, originally published by Oxford University Press 1997

Note

Bandwidth

Link Semantic Value
Term bandwidth
Status


Mandatory for


Contexts


Categories


Synonyms

frequency bandwidth

Related entries


Broader term


Narrower term


Abbreviation

Definition

absolute value of the difference between the limiting frequencies of a frequency band.

Definition Source

International Electrotechnical Commission, IEC 60050, International Electrotechnical Vocabulary, doc. 702-01-03 MOD, IEV number 101-14-59 [2]

Note

Baud

Link Semantic Value
Term baud
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Bd

Definition

The unit of modulation rate in telegraphy and data communication or the unit of line digit rate in digital transmission; when expressed in terms of this unit, the modulation rate or line digit rate equals the reciprocal of the duration in seconds of the shortest signal element or of the unit interval in a digital signal composed of signal elements of constant duration.

Definition Source

International Telecommunication Union (ITU) (2000) RECOMMENDATION ITU-R V.607-3 Terms and symbols for information quantities in telecommunications, Annex 1

Note

Beamwidth

Link Semantic Value
Term beamwidth
Status


Mandatory for


Contexts


Categories


Synonyms

beam width

Related entries


Broader term


Narrower term


Abbreviation

Definition

The width of the scanning beam main lobe measured at the minus 3-dB points and defined in angular units on the boresight, in the horizontal plane for the azimuth function and in the vertical plane for the elevation function.

Definition Source

ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids 1996, 5th ed., Amdt 76, Chap. 3, p. 43

Note

Bit error rate

Link Semantic Value
Term bit error rate
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

BER

Definition

The number of bit errors in a sample divided by the total number of bits in the sample, generally averaged over many such samples.

Definition Source

ICAO, Official definition, AN-WP/8297 Approval of Draft Report to Council on Amendment 83 to Annex 10 24/1/08, p. B-3

Note

Blind transmission

Link Semantic Value
Term blind transmission
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A transmission from one station to another station in circumstances where two-way communication cannot be established but where it is believed that the called station is able to receive the transmission.

Definition Source

ICAO, Official definition

ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status 2001, 6th ed. (Amdt 78, 14/07/2003)

PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)

Note

Boresight

Link Semantic Value
Term boresight
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

beamwidth

Broader term


Narrower term


Abbreviation

Definition

A main lobe electrical (radio) axis of an antenna.

Definition Source

ICAO, DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xii)

Note

Boundary Intermediate System

Link Semantic Value
Term Boundary Intermediate System
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

protocol data unit (PDU)

Broader term


Narrower term


Abbreviation

BIS

Definition

a router that supports IDRP and routes PDUs to more than one routing domain. (This term is defined in ICAO doc. 9705)

Definition Source

ICAO, ASIA AND PACIFIC OFFICE, ASIA/PAC ATN ROUTING ARCHITECTURE, Second Edition – March 2004 [3]

Note

Broadcast

Link Semantic Value
Term broadcast
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A transmission of information relating to air navigation that is not addressed to a specific station or stations.

Definition Source

ICAO, Official definition,

ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed. (Amdt 79, 12/07/2004), Chap. 6

PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)

Note

Built-in test equipment

Link Semantic Value
Term built-in test equipment
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

BITE

Definition

internal functions which generally test the performance of a system, sub-system or unit by the means of permanent monitoring of parameters. These checks are generally made on a short term basis (pulse repetition interval to pulse repetition interval, or scan to scan).

Definition Source

ICAO (2000) doc. SICASP/7-WP/55, Appendix B to the Report on Agenda Item 3 3B-1 APPENDIX B, PROPOSED AMENDMENT TO THE MANUAL ON TESTING OF RADIO NAVIGATION AIDS (DOC 8071) NOTES ON THE PRESENTATION OF THE AMENDMENT TO DOC 8071

Note

Context: Surveillance system performance monitoring

Cancellation ratio

Link Semantic Value
Term cancellation ratio
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

Broadly, a power ratio used in certain applications of radar that describes the degree to which the backscattered power from unwanted targets (clutter) is suppressed or canceled in one mode of measurement relative to another mode of measurement.

Definition Source

American Meteorological Society, Glossary of Meteorology [4] 2000

Note

Carrier

Link Semantic Value
Term carrier
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

An oscillation or wave, usually periodic, some characteristic of which is intended to be constrained by modulation to follow the values of a signal or of another oscillation.

Definition Source

International Telecommunications Union (ITU) Recommendation ITU-R Rec. V.662-3 (2000)

Note

Carrier phase tracking GNSS receiver

Link Semantic Value
Term carrier phase tracking GNSS receiver
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

a receiver which, in addition to using normal GNSS data processing techniques all or part of the time, continuously tracks the carrier phases of GNSS navigational satellites and uses the resulting measurements to calculate its navigational solution.

Definition Source

ICAO (2002) doc. [FANS(II)/4-Rep p.4F-1 (2.)], (GNSSP/2 Rep. p. 1A-43)

Note

Carrier-to-multipath ratio

Link Semantic Value
Term carrier-to-multipath ratio
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

C/M

Definition

The ratio of the carrier power received directly, i.e without reflection, to the multipath power, i.e carrier power received via reflection.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems) by Amdt 70 (9/11/1995)

Note

Carrier-to-noise density ratio

Link Semantic Value
Term carrier-to-noise density ratio
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

The ratio of the total carrier power to the average noise power in a 1 Hz bandwidth, usually expressed in dBHz.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems) by Amdt 70 (09/11/1995)

Note

Channel

Link Semantic Value
Term channel
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

channel rate

Broader term


Narrower term


Abbreviation

CH

Definition

A single means of direct fixed service communication between two points.

Definition Source

ICAO, Official definition, ICAO Doc 9713

Note

Channel rate

Link Semantic Value
Term channel rate
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

channel

Narrower term

channel rate accuracy

Abbreviation

Definition

The rate at which bits are transmitted over the RF channel. These bits include those bits used for framing and error correction, as well as the information bits. For burst transmission, the channel rate refers to the instantaneous burst rate over the period of the burst.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Channel rate accuracy

Link Semantic Value
Term channel rate accuracy
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

channel rate

Narrower term


Abbreviation

Definition

relative accuracy of the clock to which the transmitted channel bits are synchronized. For example, at a channel rate of 1.2 kbits/s, maximum error of one part in 10[6] implies the maximum allowed error in the clock is [+-] 1.2x10[-3] Hz.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Circuit mode

Link Semantic Value
Term circuit mode
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A configuration of the communications network which gives the appearance to the application of a dedicated transmission path.

Definition Source

ICAO, Official definition added to Annex 10/III by Amdt 70 (09/11/1995)

Note

Circular error probable

Link Semantic Value
Term circular error probable
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

CEB

Definition

In a circular normal distribution (the magnitudes of the two one- dimensional input errors are equal and the angle of cut is 90 degrees), circular error probable is the radius of the circle containing fifty per cent of the individual measurements being made, or the radius of the circle inside of which there is a fifty per cent probability of being located.

Definition Source

ICAO, doc. GNSSP/2-WP/87 (Version 4.0) - p.1A-43

Note

Specific context: GPS / GNSS

Code Division Multiple Access

Link Semantic Value
Term Code Division Multiple Access
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

CDMA

Definition

"A multiple access scheme for digital communications which uses spread spectrum modulation and orthogonal codes to avoid interference and permit many users to occupy all of the transponder bandwidth all of the time."

Definition Source

NASA Headquarters, quoted in: "Codings: Webster's Quotations, Facts and Phrases"

Note

Comm-A

Link Semantic Value
Term Comm-A
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Comm-B

Comm-C

Comm-D

Broader term


Narrower term


Abbreviation

Definition

A 112-bit interrogation containing the 56-bit MA message field. This field is used by the uplink standard length message (SLM) and broadcast protocols.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Comm-B

Link Semantic Value
Term Comm-B
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Comm-A

Comm-C

Comm-D

Broader term


Narrower term


Abbreviation

Definition

A 112-bit reply containing the 56-bit message field. This field is used by the downlink SLM, ground-initiated and broadcast protocols.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., p. 5-1

DOC 9871 Technical Provisions for Mode S Services and Extended Squitter 2008, 1st ed., p. (ix)

Note

Comm-C

Link Semantic Value
Term Comm-C
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Comm-A

Comm-B

Comm-D

Broader term


Narrower term


Abbreviation

Definition

A 112-bit interrogation containing the 80-bit MC message field. This field is used by the uplink extended length message (ELM) protocol.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., p. 5-1

DOC 9871 Technical Provisions for Mode S Services and Extended Squitter 2008, 1st ed., p. (x)

Note

Comm-D

Link Semantic Value
Term Comm-D
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Comm-A

Comm-B

Comm-C

Broader term


Narrower term


Abbreviation

Definition

A 112-bit reply containing the 80-bit MD message field. This field is used by the downlink ELM protocol.

Definition Source

ICAO, Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, p. 5-1

Note

Communication centre

Link Semantic Value
Term communication centre
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

aeronautical fixed station

aeronautical fixed service

Broader term


Narrower term


Abbreviation

Definition

An aeronautical fixed station which relays or retransmits telecommunication traffic from (or to) a number of other aeronautical fixed stations directly connected to it.

Definition Source

ICAO, Official definition, ANNEX 10/II Aeronautical Telecommunications — Communication Procedures including those with PANS status

Note

Configuration management

Link Semantic Value
Term configuration management
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

aeronautical telecommunication network (ATN)

Broader term


Narrower term


Abbreviation

Definition

An ATN systems management facility for managers to change the configuration of remote elements.

Definition Source

ICAO, Official definition, Annex 10/III (AN-WP/7595, SL 00/51, C-WP/11519)

Note

Control antenna

Link Semantic Value
Term control antenna
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

secondary surveillance radar (SSR)

Broader term


Narrower term


Abbreviation

Definition

An SSR antenna having a polar diagram which is designed to “cover” the side lobes of the main interrogating antenna. It is used to radiate a control pulse which, if it exceeds in amplitude the associated interrogation signal at the input to the transponder, will cause the transponder to inhibit responses to the interrogation pulses. Modern SSR antennas have the control elements built into the main array. The control antennas is also known as the SLS (side-lobe suppression) antenna.

Definition Source

ICAO (2004) doc. 9684, Manual of the Secondary Surveillance Radar (SSR) Systems

Note

Control pattern

Link Semantic Value
Term control pattern
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

control antenna

Broader term


Narrower term


Abbreviation

Definition

A polar diagram of the control antenna. Modern integrated SSR antennas have a “modified cardioid” beamshape.

Definition Source

ICAO (2004) doc. 9684, Manual of the Secondary Surveillance Radar (SSR) Systems

Note

Control pulse

Link Semantic Value
Term control pulse
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A pulse (P2 for Modes A and C, P5 for Mode S) transmitted by the ground equipment (SSR interrogator) in order to ensure side-lobe suppression.

Definition Source

ICAO (2004), doc. 9684, Manual of the Secondary Surveillance Radar (SSR) Systems

Note

Controller-pilot data link communications

Link Semantic Value
Term controller-pilot data link communications
Status


Mandatory for


Contexts

SESAR

Categories


Synonyms


Related entries


Broader term

data link

Narrower term


Abbreviation

CPDLC

Definition

A means of communication between controller and pilot, using data link for ATC communications.

Definition Source

ICAO Annex 2 Rules of the Air, Tenth Edition, July 2005

Note

Lexicon Release

Lexicon Release 2015.2

Data link

Link Semantic Value
Term data link
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Data link authority

Broader term


Narrower term


Abbreviation

Definition

(in common channel signalling) "a combination of two data channels operating at the same data rate but in opposite directions"

Definition Source

International Electrotechnical Commission (IEC), Electropedia database[5]

Note

Data link initiation capability

Link Semantic Value
Term data link initiation capability
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term

data link

Narrower term


Abbreviation

DLIC

Definition

A data link application that provides the ability to exchange addresses, names and version numbers necessary to initiate data link applications.

Definition Source

ICAO, Official definition, Procedures for Air Navigation Services — Air Traffic Management [ICAO Doc 4444, PANS-ATM] 2004

Note

Data link-automatic terminal information service

Link Semantic Value
Term data link-automatic terminal information service
Status


Mandatory for


Contexts

SESAR

Categories


Synonyms

digital automatic terminal information service

Related entries

automatic terminal information service (ATIS)

Broader term


Narrower term


Abbreviation

D-ATIS

Definition

The provision of ATIS via data link.

Definition Source

ICAO (2001) Official definition, Annex 11, Air Traffic Services

Note

Lexicon Release

Lexicon Release 2015.2

Digital Flight Data Acquisition Unit

Link Semantic Value
Term Digital Flight Data Acquisition Unit
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Digital Flight Data Recorder (DFDR)

Flight Data Acquisition Unit (FDAU)

Broader term


Narrower term


Abbreviation

DFDAU

Definition

an electronic device that collects, samples, conditions, and digitizes analog, discrete, and digital signals representing aircraft functions. It supplies a serial digital bit stream to the DFDR.

Definition Source

FAA (1999) Advisory Circular 20-141, AIRWORTHINESS AND OPERATIONAL APPROVAL OF DIGITAL FLIGHT DATA RECORDER SYSTEMS [6]

Note

A DFDAU differs from a Flight Data Acquisition Unit (FDAU) in that a DFDAU is capable of receiving both analog and digital data streams and converting them to the required DFDR digital data format. (See Aeronautical Radio Incorporated (ARINC) Characteristic 717.)

Digital Flight Data Recorder

Link Semantic Value
Term Digital Flight Data Recorder
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries

Digital Flight Data Acquisition Unit (DFDAU)

Flight Data Acquisition Unit (FDAU)

Broader term


Narrower term


Abbreviation

DFDR

Definition

a recording device that utilizes a digital method to record and store data onto a storage medium and to retrieve that data from the medium. A DFDR may be the storage device in a recording system that includes a DFDAU or a FDAU. Or, it may be a stand-alone device using an internal data collection system to convert aircraft analog and discrete signals to digital form.

Definition Source

FAA (1999) Advisory Circular 20-141, AIRWORTHINESS AND OPERATIONAL APPROVAL OF DIGITAL FLIGHT DATA RECORDER SYSTEMS [7]

Note

Doppler shift

Link Semantic Value
Term Doppler shift
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

The frequency shift observed at a receiver due to any relative motion between transmitter and receiver.

Definition Source

ICAO (2006) Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Doppler speed

Link Semantic Value
Term Doppler speed
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

The radial (to the radar sensor) velocity of a target (aircraft) or of a clutter source (false alarm) measured from its Doppler frequency shift in a received primary radar return.

Definition Source

EUROCONTROL, SASS-C Glossary

Note

Downlink

Link Semantic Value
Term Downlink
Status


Mandatory for


Contexts


Categories


Synonyms


Related entries


Broader term


Narrower term


Abbreviation

Definition

A term referring to the transmission of data from an aircraft to the ground. Mode S air-to-ground signals are transmitted on the 1 090 MHz reply frequency channel.

Definition Source

ICAO, Official definition:

ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., Amdt. 77 (27/02/2002), p. 5-1

DOC 9871 Technical Provisions for Mode S Services and Extended Squitter 2008, 1st ed., p. (x)

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Effective acceptance bandwidth

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Term effective acceptance bandwidth
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Abbreviation

Definition

The range of frequencies with respect to the assigned frequency for which reception is assured when all receiver tolerances have been taken into account.

Definition Source

ICAO (2006), Official definition, Annex 10, Vol. I (Aeronautical Telecommunications — Radio Navigation Aids)

Note

Effective adjacent channel rejection

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Term effective adjacent channel rejection
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Abbreviation

Definition

The rejection that is obtained at the appropriate adjacent channel frequency when all relevant receiver tolerances have been taken into account.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I (Aeronautical Telecommunications — Radio Navigation Aids)

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Electronic Flight Bag

Link Semantic Value
Term Electronic Flight Bag
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Abbreviation

EFB

Definition

Electronic computing and/or communications equipment or systems used to display a variety of aviation data or perform a variety of aviation functions. The scope of EFB functionality may include data connectivity. EFBs may be portable electronic devices or installed systems. The physical EFB may use various technologies, formats and forms of communications.

Definition Source

Transport Canada (2005), AERONAUTICAL INFORMATION CIRCULAR 1/05, USE OF ELECTRONIC FLIGHT BAGS (EFB)[8]

Note

More details on the 3 different EFB classes can be found on SKYBRARY [9]

Encoder/decoder

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Term Encoder/decoder
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Abbreviation

CODEC

Definition

Encoder/decoder entity used for encoding and decoding data to be transmitted and received, respectively.

Definition Source

International Telecommunication Union (ITU), website, Terminology, Terms and Definitions tool [10]

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Essential radio navigation service

Link Semantic Value
Term essential radio navigation service
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Abbreviation

Definition

A radio navigation service whose disruption has a significant impact on operations in the affected airspace or aerodrome.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I (Aeronautical Telecommunications — Radio Navigation Aids)

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Field

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Term field
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Abbreviation

Definition

A defined number of contiguous bits in an interrogation or reply.

Definition Source

ICAO (2004), doc. 9684 Manual of the Secondary Surveillance Radar (SSR) Systems

Note

Flight Data Acquisition Unit

Link Semantic Value
Term Flight Data Acquisition Unit
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Digital Flight Data Recorder (DFDR)

Digital Flight Data Acquisition Unit (DFDAU)

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Narrower term


Abbreviation

FDAU

Definition

an electronic device that collects, samples, conditions, and digitizes analog signals representing aircraft functions. The FDAU does not normally have the capability to condition digital signals. It provides data to the DFDR in a digital bit stream. See the definition for DFDAU. (See ARINC Characteristic 573.)

Definition Source

FAA (1999) Advisory Circular 20-141, AIRWORTHINESS AND OPERATIONAL APPROVAL OF DIGITAL FLIGHT DATA RECORDER SYSTEMS [11]

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Front course sector

Link Semantic Value
Term front course sector
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back course sector

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Abbreviation

Definition

The course sector which is situated on the same side of the localizer as the runway.

Definition Source

ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids 1996, 5th ed., Amdt. 74, p. 5

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Ground earth station

Link Semantic Value
Term ground earth station
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aircraft earth station (AES)

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Abbreviation

GES

Definition

An earth station in the fixed satellite service, or, in some cases, in the aeronautical mobile-satellite service, located at a specified fixed point on land to provide a feeder link for the aeronautical mobile-satellite service.

Definition Source

ICAO, Official definition added to Annex 10/III (Aeronautical Telecommunications) by Amdt 70 (09/11/1995)

Note

This definition is used in the ITU's Radio Regulations under the term 'aeronautical earth station.' The definition herein as 'GES' for use in the draft SARPs is to clearly distinguish it from an aircraft earth station (AES), which is a mobile station on an aircraft.

Hit

Link Semantic Value
Term hit
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Abbreviation

Definition

A reception by the aircraft equipment (transponder) of one usable set of interrogation pulses as evidenced by a reply code return (i.e. receipt of 2 interrogation pulses and 1 control pulse).

Definition Source

ICAO (2004) doc. 9684 Manual of the Secondary Surveillance Radar (SSR) Systems

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Large vertical aperture antenna

Link Semantic Value
Term large vertical aperture antenna
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Abbreviation

LVA

Definition

An SSR antenna comprising two-dimensional array radiating elements. A typical LVA consists of a number of columns (each consisting of a vertical linear array designed to produce beam shaping in the vertical plane) arranged in a horizontal linear array to produce between 2° and 3° azimuth beamwidth. Typically, LVA antennas are a pre-requisite for monopulse SSR systems.

Definition Source

ICAO (2004) DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xi) & p. (xix)

Note

Mean power (of a radio transmitter)

Link Semantic Value
Term mean power (of a radio transmitter)
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Abbreviation

Definition

The average power supplied to the antenna transmission line by a transmitter during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation taken under normal operating conditions.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Telecommunications — Radio Navigation Aids

Note

A time of 1/10 second during which the mean power is greatest will be selected normally. (same source)

Mode C out of spec

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Term Mode C out of spec
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SSR Mode C

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Abbreviation

Definition

A Mode C is said to be out of spec if it is less than FL- 12 parameters or greater than FL700 parameters.

Definition Source

EUROCONTROL SASS-C Glossary

Note

Mode S

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Term Mode S
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secondary surveillance radar (SSR)

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Abbreviation

Definition

An enhanced mode of SSR that permits selective interrogation and reply capability.

Definition Source

ICAO (2004) doc. 9684 Manual of the Secondary Surveillance Radar (SSR) Systems

Note

Whilst traditional Secondary Surveillance Radar (SSR) stations interrogate all aircraft within their range, Mode S establishes selective and addressed interrogations with aircraft within its coverage. Such selective interrogation improves the quality and integrity of the detection, identification and altitude reporting. These improvements translate into benefits in terms of safety, capacity and efficiency - benefits which are key to supporting the future of the high-traffic density airspace of Europe.

Note Source

EUROCONTROL, CFMU Glossary, Sept. 2011


Mode S air-initiated Comm-B protocol

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Term Mode S air-initiated Comm-B protocol
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AICB protocol

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Broader term

Mode S

Narrower term


Abbreviation

Definition

A procedure initiated by a Mode S transponder for transmitting a single Comm-B segment from the aircraft installation.

Definition Source

ICAO (1997) Official definition added to Annex 10/III by Amdt 72

ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems 1995, 1st ed., p. 5-2

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Mode S subnetwork

Link Semantic Value
Term Mode S subnetwork
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Mode select sub network

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Broader term

Mode S

Narrower term


Abbreviation

Definition

A means of performing an interchange of digital data through the use of secondary surveillance radar (SSR) Mode S interrogators and transponders in accordance with defined protocols.

Definition Source

ICAO (1995) Official definition, ANNEX 10/III Aeronautical Telecommunications — Part I, Digital Data Communication Systems; Part II, Voice Communications Systems

Note

Multilateration system

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Term multilateration system
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time difference of arrival (TDOA)

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wide area multilateration (WAM)

Abbreviation

MLAT

Definition

A group of equipment configured to provide position derived from the secondary surveillance radar (SSR) transponder signals (replies or squitters) primarily using time difference of arrival (TDOA) techniques. Additional information, including identification, can be extracted from the received signals.

Definition Source

ICAO (2010), ANNEX 10/IV Aeronautical Telecommunications — Surveillance Radar and Collision Avoidance Systems 2010, Amdt. 85

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Navigation specification

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Term navigation specification
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area navigation (RNAV) specification

required navigation performance (RNP) specification

Abbreviation

Definition

A set of aircraft and flight crew requirements needed to support performance-based navigation operations within a defined airspace. There are two kinds of navigation specifications:

Required navigation performance (RNP) specification. A navigation specification based on area navigation that includes the requirement for performance monitoring and alerting, designated by the prefix RNP, e.g. RNP 4, RNP APCH.

Area navigation (RNAV) specification. A navigation specification based on area navigation that does not include the requirement for performance monitoring and alerting, designated by the prefix RNAV, e.g. RNAV 5, RNAV 1.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Telecommunications — Radio Navigation Aids

Note

The term RNP, previously defined as “a statement of the navigation performance necessary for operation within a defined airspace”, has been removed (...) as the concept of RNP has been overtaken by the concept of PBN. The term RNP (...) is now solely used in the context of navigation specifications that require performance monitoring and alerting, e.g. RNP 4 refers to the aircraft and operating requirements, including a 4 NM lateral performance with on-board performance monitoring and alerting that are detailed in The PNB Manual. (same source)

Omnidirectional antenna

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Term omnidirectional antenna
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Abbreviation

Definition

An antenna with the same gain in all directions. In earlier side-lobe suppression systems, this antenna type was often used for transmitting the P2 pulse and sometimes also for transmission of the P1 pulse (I2SLS). Modern omnidirectional antennas for ground SSR use include a “notch” coinciding with the peak of the main beam.

Definition Source

ICAO (2004) DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xii)

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Protocol data unit

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Term protocol data unit
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Abbreviation

PDU

Definition

A unit of data transferred between peer entities within a protocol layer consisting of protocol control information and higher layer user data (i.e. service data units)

Definition Source

ICAO (1996) ANNEX 10, VOLUME 3, PART 1, CHAPTER 3, Aeronautical Telecommunication Network (ATN), Chapter 3, p.30 [12]

Note

Radar beacon

Link Semantic Value
Term radar beacon
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beacon

Narrower term


Abbreviation

Definition

"A transponder beacon transmitting a coded signal on radar frequency, permitting an interrogating craft to determine the bearing and range of the transponder."

Definition Source

NATO: NORTH ATLANTIC TREATY ORGANIZATION, Advisory Group for Aerospace Research and Development (AGARD/NATO) (1980), "Agard Multilingual Aeronautical Dictionary", Second Edition, London

Note

Radio beacon

Link Semantic Value
Term radio beacon
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beacon

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Abbreviation

Definition

"A radio transmitter whose radiations enable a craft to determine its own direction or position relative to the beacon by means of a communication receiver or direction finder."

Definition Source

NATO: NORTH ATLANTIC TREATY ORGANIZATION, Advisory Group for Aerospace Research and Development (AGARD/NATO) (1980), "Agard Multilingual Aeronautical Dictionary", Second Edition, London

Note

Radio navigation service

Link Semantic Value
Term radio navigation service
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essential radio navigation service

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Abbreviation

Definition

A service providing guidance information or position data for the efficient and safe operation of aircraft supported by one or more radio navigation aids.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I (Aeronautical Telecommunications — Radio Navigation Aids)

Note

Reflector antenna

Link Semantic Value
Term reflector antenna
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Abbreviation

Definition

An antenna producing the beam by a method analogous to optics. In most cases the “reflector” surface of the antenna is illuminated by a radio frequency source (e.g. a radio-frequency “horn” assembly). The dimensions of the reflector antenna both in the horizontal and vertical plane, together with the characteristics of the illuminating source, determine the shape and magnitude of the radar beam produced.

Definition Source

ICAO (2004) DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xi)

Note

Required navigation performance (RNP) specification

Link Semantic Value
Term required navigation performance (RNP) specification
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area navigation (RNAV) specification

required navigation performance (RNP)

Broader term

navigation specification

Narrower term


Abbreviation

Definition

A navigation specification based on area navigation that includes the requirement for performance monitoring and alerting, designated by the prefix RNP, e.g. RNP 4, RNP APCH.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Communications - Radio navigation aids

Note

Routing domain

Link Semantic Value
Term routing domain
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ATN router

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ATN routing domain confederation

Abbreviation

RD

Definition

A set of end systems and intermediate systems that operate the same routing protocols and procedures and that are wholly contained within a single administrative domain.

Definition Source

ICAO (1996) Aeronautical Telecommunication Network (ATN) Standards and Recommended Practices (SARPs), Sub-Volume 1, Introduction and System-Level Requirements, Version 0.7, 19-June-1996

Note

A routing domain may be divided into multiple routing subdomains.

SSR code

Link Semantic Value
Term SSR code
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code (SSR)

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secondary surveillance radar (SSR)

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Abbreviation

Definition

1. code (SSR) "The number assigned to a particular multiple pulse reply signal transmitted by a transponder in Mode A or Mode C."

2. SSR code "A four-digit octal number received from the aircraft transponder when it is interrogated by a secondary surveillance radar (SSR)"

Definition Source

1. ICAO, Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2001, 14th ed. (Amdt 3, 29/06/2004)

2. Transport Canada (2010) Glossary for Pilots and Air Traffic Services Personnel, [13]

Note

Secondary surveillance radar

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Term secondary surveillance radar
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Air Traffic Control Radar Beacon System

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Abbreviation

SSR

Definition

A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.

Definition Source

ICAO Official definition, ANNEX 10/IV Aeronautical Telecommunications — Surveillance Radar and Collision Avoidance Systems

Note

Secondary surveillance radar (SSR), which had its beginnings in wartime Identification Friend or Foe (IFF) systems, transmits pulses of energy which trigger a response from an airborne transponder, with range and bearing obtained in the same way as primary radar. (source: ICAO, "APOSI Airports International" 1993, April, p. 28 [TF-ATM])

Sum and difference antenna

Link Semantic Value
Term sum and difference antenna
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large vertical aperture antenna (LVA)

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Abbreviation

Definition

A hog-trough or LVA antenna which is electrically split into two halves. The two half-antenna outputs are added in phase at one output port (sum, ) and added in antiphase at a second output port (difference, ) to produce output signals which are sensitive to the azimuth angle of arrival of received signals, enabling an off-boresite angle for the signal source to be obtained.

Definition Source

ICAO (2004) DOC 9684 Manual of the Secondary Surveillance Radar (SSR) Systems 2004, 3rd ed., p. (xi)

Note

Time difference of arrival

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Term time difference of arrival
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multilateration system

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Abbreviation

TDOA

Definition

The difference in relative time that a transponder signal from the same aircraft (or ground vehicle) is received at different receivers.

Definition Source

ICAO (2010) ANNEX 10/IV Aeronautical Telecommunications — Surveillance Radar and Collision Avoidance Systems 2010, amdt 85

Note

Wide area multilateration

Link Semantic Value
Term wide area multilateration
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multilateration system

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Abbreviation

WAM

Definition

Multilateration systems that monitor aircraft in flight. (As distinct from surface surveillance)

Definition Source

National Aerospace Laboratory NLR (2005), NLR-CR-2004-472, Wide Area Multilateration, Report on EATMP TRS 131/04, Version 1.1

Note

Z marker beacon

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Term Z marker beacon
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Marker Radio Beacon

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Abbreviation

Definition

A type of radio beacon, the emissions of which radiate in a vertical cone-shaped pattern.

Definition Source

ICAO (2006) Official definition, Annex 10, Vol. I, Aeronautical Telecommunications — Radio Navigation Aids

Note