Passive Detection Method of Multiple Radar Signals Based on Circular Cycle Constant False Alarm Rate
Low probability of intercept(LPI)radars have the characteristics of low transmitting power,which results in low signal-to-noise ratio of the radar signal received by the radar reconnais-sance receiver.Existing passive detection methods cannot effectively detect weak signals.To solve this problem,a passive detection method of multiple radar signals based on circular cycle constant false alarm rate is proposed under the background of Gauss white noise.The false alarm probabili-ties and detection probabilities of four detectors based on circular cycle cell averaging(CA)-con-stant false alarm rate(CFAR),greatest of(GO)-CFAR,smallest of(SO)-CFAR and ordered sta-tistics(OS)-CFAR are derived.The simulation results show that in the presence of a single signal under Gaussian white noise background,the detection performance of CA-CFAR based on circular cycle is the best.When there are multiple signals,the detection performance of CA-CFAR based on circular cycle is poor,while the detection performance of OS-CFAR is better.In addition,the detec-tion performance can be further improved by using multi-frame detection.The method proposed in this paper has low complexity and high real-time performance,which can meet the demands of practical engineering.
digital receiverlow signal-to-noise ratiomultiple signalssignal detectioncircular cy-cleconstant false alarm rate
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