circular error probability


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circular error probability (CEP)

circular error probability (CEP)
The radius of a circle within which half the missiles or projectiles are expected to fall. It is an indicator of the delivery accuracy of a weapon system, used as a factor in determining probable damage to a target. The CEP is expressed as a distance and a clock code from the desired point of impact. Also called circular probable error.
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Overall, terrain referenced navigation accuracies of 30 m circular error probability (horizontal) and 3 m linear error probability (vertical) are reported as being achievable over terrain rougnesses down to two per cent.
In less than a minute, the position of a downed airman can be determined to within a 15-m circular error probability using the precise positioning service GPS mode.
It utilizes an integrated GPS receiver with an uncorrected derived location range from 5-10 meters and 1-5 meter Circular Error Probability relative locations using standard DGPS corrections.