Interrupted-Sampling Repeater Jamming Suppression Based on Phase-Encoded Waveform and Mismatched Filter Design

Abstract

Interrupted-sampling repeater jamming (ISRJ) generates a number of controllable false targets in the range dimension of radar signal by using the principle of signal undersampling and the characteristics of matched filtering. Based on the characteristics of ISRJ sampling function, this paper presents a design method of phase coded waveform and mismatched filter for ISRJ. According to the parameters of pulse width and repetition frequency of interference, a phase coded signal of mismatched filtering suitable for suppressing ISRJ is designed before the radar transmits the signal. According to the ISRJ sampling function and the coded signal designed before transmission, a mismatched filter to suppress ISRJ is constructed to reduce the interference energy after receiving the echo with interference. The simulation results show that compared with traditional unprocessed phase coded signals, the optimized signals of the proposed method exhibit better anti-jamming capability.

Keywords

• |mismatched filter|phase coded signal|interrupted-sampling repeater jamming|waveform design