Research on ISRJ interference suppression method based on time domain filter

Abstract

The linear frequency modulation (LFM) signal is a common transmit signal of radar, which can significantly improve the performance of the radar. However, when the main lobe of the radar is affected by interrupted sampling reperter jamming (ISRJ), its detection performance is degraded because the jamming signal and the transmitted signal are highly coincident in the time and frequency domains. Using the principle of time-domain discontinuity of the ISRJ signal, we propose an anti-ISRJ jamming algorithm based on time-domain filter and compressive sensing reconstruction. Then, we focus on analyzing the performance of the algorithm in suppressing ISRJ signals with different duty cycles. The simulation results show that the proposed algorithm can effectively suppress ISRJ with different duty cycles, and the larger the ISRJ duty cycle, the better the suppression effect.