An Improved Radar Anti-jamming Method

When the interference enters from the main lobe direction of the radar, the adaptive side-lobe cancellation algorithm will lead to beam distortion, main lobe pointing offset, and affect the detection of the target. This paper proposes a phase-coded signal system. Anti-jamming method, according to the characteristics of the transmitted signal, to construct a matched filter and blocking filter, the received signal through the two filters to get two signals, and then use the side lobe cancellation algorithm to filter out the interference of the auxiliary channel. However, this method will cause the sidelobe of the target Doppler cell to rise. For this problem, we propose to remove the Doppler trespass element from the target and then perform sidelobe cancellation. The algorithm is found through simulation. The interference from the main lobe can be effectively suppressed, and the distance sidelobes of the target Doppler unit are reduced, which verifies the effectiveness of the algorithm.