# circular error

Also found in: Acronyms.

## circular error

[′sər·kyə·lər ′er·ər]
(ordnance)
A bombing error measured by the radial distance of a point of bomb impact, or mean point of impact, from the center of the target, excluding gross errors.
With an airburst atomic bomb, the bombing error measured from the point on the ground immediately below the bomb burst to the desired ground zero.

## circular error (CE)

An accuracy figure representing the stated percentage of probability that any point expressed as a function of two linear components (e.g., horizontal position) will be within the given figure. Circular error probability (CEP 50%), and CE (90%) are used commonly. A horizontal measurement on the ground, in feet or meters, defining a radius of a circle, within which an object of known coordinates should be found on an image. The CE value should have some measure of probability (P) associated with it. For example, a CE of 100 m and .9 P, means that 90% of the time the object will fall within a circle having a radius of 100 m. Circular error is normally used in armament delivery results.
References in periodicals archive ?
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.
Anthony Cordesman, a researcher at the Center for Strategic and International Studies (CSIS) in Washington, DC, wrote in January that the Emad was designed to have a range of 1,700 kilometers (1,100 miles), which is enough to reach Cairo and thus all of Israel, a payload of 750 kilos (1,640 pounds), which is not very much, and a circular error of probability (CEP) of 500 meters (a third of a mile), which is fine for a nuclear warhead but utterly abysmal for a non-nuclear payload.
In military parlance, that's called circular error probability.
The JDAM, with its GPS/inertial guidance package, already betters its circular error probable (CEP) of 13 meters.
Key user requirements include a minimum range of 15 km; air transportability (both by fixed-wing transporter and as a helicopter sling-load); a 75-m circular error of probability against a 155mm shell at a range of 15 km and an elevation of 25[degrees]; a 50-percent probability of detection; an operational availability figure of at least 95 percent over a 30-day in-action period and interoperability with indirect-fire systems via digital links.
5 minutes and achieved a circular error probable (CEP) of about 75 meters.
Resolutions vary from "fine" resolution with a 500-m circular error of probability (CEP) and "precision" resolution of 150-m CEP at 0-40 km range to 1,500-m CEP "fine" resolution and 450-m CEP "precision" resolution at 80-120 km from the emitter.
He put the accuracy of the Shahab-3 at a circular error of probability (CEP) of 2.
Resolutions vary from "fine" resolution 500-m circular error of probability (CEP) and "precision" resolution of 150-m CEP at 0-40 km range to 1,500-m CEP "fine" resolution and 450-m CEP "precision" resolution at 80-120 km from the emitter.
The Shahab is estimated to have a circular error of probability (CEP) of 2.
3] concept, multiple aircraft fitted with electronic support measures receivers will be networked over a high-speed communications link to provide real-time targeting of hostile emitters with a circular error of probability between 15 and 50 meters.
The term circular error probable (CEP) is often used to describe the location accuracy Of an emitter location system.

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