circular error probable


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circular error probable

[′sər·kyə·lər ¦er·ər ′präb·ə·bəl]
(aerospace engineering)
References in periodicals archive ?
The 50 and 95% Circular Error Probable (CEP) for 2-dimensional and 3-dimensional locations for inactive periods in which at least 5 successful locations were obtained.
Throughout, Sion sprinkles in some strange terms and facts: "Circle of error" when he means "circular error probable, a measure of weapon accuracy; Congressional Medal of Honor (it is the Medal of Honor); Messerschmitt 109 (variously called the Me-109, ME-109, Bf-109 in the same paragraph).
After reading Maj Jack Sine's article "Defining the 'Precision Weapon' in Effects-Based Terms" (Spring 2006), I will be interested to see how the concept of circular error probable is applied to anticipated directed-energy weapons.
"So, engineers see specs such as 'accurate to 50 cm CEP,' 'accurate to 50 cm RMS,' or 'accurate to 50 cm 2DRMS.' You must know how to analyze and convert between those different accuracy measures, because 50 cm CEP refers to the radius of a circle in which 50 percent of the values occur, while 50 cm 2DRMS equals better than 50 cm accuracy 95 percent of the time." CEP stands for circular error probable and 2DRMS equals two times the horizontal RMS error value.
Another measure is called "circular error probable." A CEP of 10 meters means that, half the time, the weapon falls within a 10meter circle around the target.
But the Fateh has a "circular error probable" (CEP) of 330 feet, while the Scud's CEP is 1,480 feet.