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Constant false alarm rate (CFAR) detection is a common form of adaptive algorithm used in radar systems to detect target returns against a background of noise, clutter and interference. [ 1 ] Principle
Constant False Alarm Rate detection performed on FFT output. Constant false alarm rate processing is used to examine each FFT output to detect signals. This is an adaptive process that adjusts automatically to background noise and environmental influences. There is a cell under test, where the surrounding cells are added together, multiplied by ...
In addition, noise in the radar receiver will occasionally exceed the detection threshold of the radar's Constant false alarm rate detector and be incorrectly reported as targets (known as false alarms). The role of the radar tracker is to monitor consecutive updates from the radar system (which typically occur once every few seconds, as the ...
False alarms are also common with smoke detectors and building fire alarm systems. They occur when smoke detectors are triggered by smoke that is not a result of a dangerous fire. Smoking cigarettes, cooking at high temperatures, burning baked goods, blowing out large numbers of birthday candles, fireplaces and woodburners when used around a ...
The false positive rate is calculated as the ratio between the number of negative events wrongly categorized as positive (false positives) and the total number of actual negative events (regardless of classification). The false positive rate (or "false alarm rate") usually refers to the expectancy of the false positive ratio.
An airline spokesperson said an indicator light was later confirmed to be false. An American Airlines jet made an emergency landing Sunday after the crew reported a "possible electric issue."
St. John Fisher University went into lockdown Tuesday evening after security software mistook theater prop guns as real firearms.
Much of the system's resistance to ECM was accomplished in the constant false alarm rate processing. [6] CFAR algorithms are used to extract signals from noisy input by looking for pulses that have higher energy than the overall noise rate. Most jammers produce what appears to be short pulses of signal spread across a wide bandwidth.