CEP

Circular Error Probable is a measure of weapon system accuracy, defined as the radius of a circle within which half of all projectiles or missiles are expected to fall. CEP is a key performance specification in weapons system contracts and testing requirements.

CEP requirements appear in development and production contracts for precision munitions, missiles, and guided weapons. Understanding CEP specifications helps contractors develop systems that meet accuracy requirements and design test programs to validate performance. CEP improvements are often program objectives in weapons modernization efforts.