Circular error probable
From EUROCONTROL ATM Lexicon
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/2WP/87 (Version 4.0)  p.1A43
Note
Specific context: GPS / GNSS