circular error probable


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circular error probable

An indicator of the delivery accuracy of a weapon system, used as a factor in determining probable damage to a target. It is the radius of a circle within which half of a missile's projectiles are expected to fall. Also called CEP. See also delivery error; deviation; dispersion error; horizontal error.
References in periodicals archive ?
Williams, "A Comparison of Circular Error Probable Estimators for Small Samples," DTIC Document, 1997.
The reality of the air war over Germany--overcast skies, smoke from factories, German antiaircraft defenses, and a myriad of other factors--produced an average circular error probable of about half a mile (that is, half of the bombs dropped fell inside a circle a half of a mile in diameter, and the other half fell outside) with many bombs hitting the ground up to five miles from the designated target.
With a circular error probable (CEP) of two miles, it was intended for strategic targets such as cities rather than those requiring pin-point accuracy.
The military tends to define missile accuracy and reliability with a two-dimensional statistical metric called Circular Error Probable or CEP.
TLE and WDE can be stated as circular error probable (CEP), as the story explains, which is a 50th percentile measurement.