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However, in most fielded systems, unwanted clutter and interference sources mean that the noise level changes both spatially and temporally. In this case, a changing threshold can be used, where the threshold level is raised and lowered to maintain a constant probability of false alarm. This is known as constant false alarm rate (CFAR) detection.
The returning image may be much larger than the "dot" or "hole", as it has become known, anyway. Keeping the transponder's pulse widths very narrow and mode of operation (single pulse rather than multi-pulse) becomes a crucial factor. The external radar could, in theory, come from an aircraft flying alongside your own, or from space.
Non-Doppler radar systems cannot be pointed directly at the ground due to excessive false alarms, which overwhelm computers and operators. Sensitivity must be reduced near clutter to avoid overload. This vulnerability begins in the low-elevation region several beam widths above the horizon, and extends downward.
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. [1] It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the frequency of the returned signal.
Low false alarm rates: a radar that puts out false targets is at best an irritant and tactically can confuse the security team. A good PSR should have a designed false alarm rate of two or less false alarms per day. (A false alarm should not be confused with a nuisance alarm caused by, for example, an animal).
FTC settles with weapon detector maker used at schools, stadiums over false claims December 3, 2024 at 11:06 AM The Evolv Express weapons detection system lights up red during a demonstration, May ...
A Chinese government agency established to promote trade with Russia has been trying to source drone detectors and jammers, adding to concerns that Beijing may be supplying dual-use technology to ...
The MHT calculates not only the probabilities of previously-detected tracks, but also the probabilities of false alarms and new tracks. As a result, it might handle multiple parts of the radar tracker algorithm, i.e. the plot-to-track, the smoothing, and the initialization. MHT can be implemented as either hypothesis-oriented or track-oriented.