FM interference suppression for PRC-CW radar based on adaptive STFT and time-varying filtering  

作　　者：Zhao Zhao Xiangquan Shi 

机构地区：[1]School of Electronic Engineering and Optoelectric Technology,Nanjing University of Science and Technology, Nanjing 210094, E R. China

出　　处：《Journal of Systems Engineering and Electronics》2010年第2期219-223,共5页系统工程与电子技术（英文版）

摘　　要：The influence of frequency modulation （FM） interfer- ence 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 inter- ference power exceeds the anti-jamming limit of the radar. Accord- ing to the fact that the PRC-CW radar echo is a wideband pseudo random signal occupying the whole TF plane, while the FM in- terference only concentrates in a small portion, a new method is proposed based on adaptive short-time Fourier transform （STFT） and time-varying filtering for FM interference suppression. This method filters the received signal by using a binary mask to excise only the portion of the TF plane corrupted by the interference. Two types of interference, linear FM （LFM） and sinusoidal FM （SFM）, under different signal-to-jamming ratio （S JR） are studied. It is shown that the proposed method can effectively suppress the FM interference and improve the performance of target detection.The influence of frequency modulation （FM） interfer- ence 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 inter- ference power exceeds the anti-jamming limit of the radar. Accord- ing to the fact that the PRC-CW radar echo is a wideband pseudo random signal occupying the whole TF plane, while the FM in- terference only concentrates in a small portion, a new method is proposed based on adaptive short-time Fourier transform （STFT） and time-varying filtering for FM interference suppression. This method filters the received signal by using a binary mask to excise only the portion of the TF plane corrupted by the interference. Two types of interference, linear FM （LFM） and sinusoidal FM （SFM）, under different signal-to-jamming ratio （S JR） are studied. It is shown that the proposed method can effectively suppress the FM interference and improve the performance of target detection.

关 键 词：interference suppression frequency modulation in- terference adaptive short-time Fourier transform （STFT） time- varying filtering pseudo random code continuous wave （PRC-CW） radar. 

分 类 号：TN958.94[电子电信—信号与信息处理] TN914.42[电子电信—信息与通信工程]