A method for suppressing ISRJ based on noise frequency modulated signal and multi-channel matched filtering

This paper introduces a method for suppressing interrupted sampling repeater jamming (ISRJ) based on noise frequency modulation (NFM) signals and multi-channel matched filtering. By taking advantage of the relevant characteristics of the NFM signal and the interval sampling characteristic of interference signals, a group of matched filters is constructed to judge the peak fluctuation of the pulse compression peak, distinguish interference signals from target echoes, and finally eliminate interference components. Compared with traditional ISRJ suppression methods, this method eliminates the influence of intra-pulse time-frequency coupling in the transmitted signal, significantly reduces the number of interference peaks, making the identification and suppression of interference segments precise. Simulation results demonstrate the effectiveness of the proposed method.