Median Filter Based FM Interference Suppression for PRC-CW Radar

The influence of 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. A new method is proposed based on adaptive STFT and median filter 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 interference 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.