Parametric Study of a Nonsuppressing CFAR (Constant False Alarm Rate) Detector.
NAVAL RESEARCH LAB WASHINGTON DC
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This report describes a parametric analysis of a modified conventional constant false alarm rate CFAR detector. The modified CFAR detector is nonsuppressing in the sense that targets or other interfering signals in the reference cells of the detector will not suppress or prevent the detection of targets. The modification consists of dividing the set of reference cells used for determining the detection threshold in a conventional CFAR into N batches. Each batch is used to set a detection threshold and the test cell is compared to all the thresholds. If the test cell exceeds M or more of the N thresholds, a detection is declared. The values selected for the various parameters by the study were M 4 and N 6 batches of 4 samples each. With these values, the nonsuppressing CFAR required approximately equals 1 dB higher signal-to-noise ratio to achieve detection performance equivalent to the conventional CFAR in the absence of interfering targets. On the other hand, a large target in the reference cells of a conventional CFAR could completely suppress detection, while the same amount of interference causes only minor degradation in performance of the nonsuppressing CFAR detector. Author
- Numerical Mathematics