Circular error probable
|Term||circular error probable|
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.
ICAO, doc. GNSSP/2-WP/87 (Version 4.0) - p.1A-43
Specific context: GPS / GNSS