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FM Interference Suppression for PRC-CW Radar Based on ASTFT and Median Filtering


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FM Interference Suppression for PRC-CW Radar Based on ASTFT and Median Filtering
CHEN Wen-wuCAI Zheng-yuCHEN Ru-shan
School of Electronic Engineering and Optoelectric Technology,NUST,Nanjing 210094,China
pseudo random code interference suppression frequency modulation interference adaptive short-time Fourier transform median filtering
The influence of frequency modulation(FM) interference on correlation detection performance of the pseudo random code continuous wave(PRC-CW)radar is analyzed.It is found that the correlation output deteriorates greatly when the FM interference power exceeds the anti-jamming limitation of the radar.According to the fact that the PRC-CW radar return signal is a wideband pseudo random signal occupying the whole time-frequency(TF) plane,whereas the FM interference signal is well concentrated in the TF plane,a new method is proposed based on adaptive short-time Fourier transform(ASTFT) and median filtering for FM interference suppression.This method implements the filtering of the received signal by substituting the median filter output for only a portion of the TF plane corrupted by the interference.The echo signals corrupted by two types of interferences including linear FM(LFM)and sinusoidal FM(SFM)forms under different signal-to-jamming ratio(SJR)situations are simulated.It is shown that the method can effectively suppress the FM interference and improve the performance of target detection significantly.


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Last Update: 2012-04-30