关键词: 子脉冲幅度调制, 间歇采样转发干扰, 子脉冲交替掩护, 复杂波形干扰

Abstract:

To address the issue wherein radars utilizing intra-pulse segmented anti-jamming techniques based on sub-pulse alternating cover can effectively identify and suppress traditional interrupted-sampling repeater jamming (ISRJ) at the receiving end, an improved ISRJ method is proposed. By performing intermittent sampling and amplitude modulation on the intercepted radar signal at the jammer’s transmitter, an interrupted jamming signal with non-uniform sub-pulse amplitudes is generated. This causes the variance of the low-amplitude jamming sub-pulses after segmented pulse compression to fall below the anti-jamming detection threshold, thereby effectively bypassing the radar’s variance-energy correlation-based jamming detection mechanism. The constraints on the amplitude ratio of the jamming sub-pulses are derived, and the impact of different numbers of segments on the jamming performance is analyzed. Simulation results demonstrate that, under typical parameter settings, the proposed method can effectively retain partial jamming energy and produce significant deceptive effects, counteract intra-pulse segmented anti-jamming measures, and enhance the survivability of jamming signals under new anti-jamming systems.

Key words: sub-pulse amplitude modulation, intermiffent-sampling repeater jamming（ISRJ）, sub-pulse alternating cover, complex waveform jamming