快慢时间域联合处理抑制C&I干扰

频谱弥散(smeared spectrum, SMSP)干扰和切片组合(chopping and interleaving, C&I)干扰是两种用于对抗线性调频(linear frequency modulation, LFM)脉冲压缩雷达的干扰样式。相比SMSP干扰, C&I干扰与雷达发射信号相似度更高,干扰抑制更为困难。针对该问题,以远距离支援干扰下LFM相参雷达对抗C&I干扰为背景,提出快慢时间域联合处理C&I干扰抑制算法。分析了C&I干扰时频特征和对相参雷达的干扰特性,在此基础上,通过快慢时间域处理估计干扰位置、幅度、多普勒频率、采样周期、采样脉宽等参数,重构干扰信号,通过对消实现干扰抑制。仿真试验验证了所提算法的可行性和有效性。

Fast-slow time domain joint processing to suppress C&I jamming

Smeared spectrum (SMSP) jamming and chopping and interleaving (C&I) jamming are invented to counter linear frequency modulation (LFM) pulse compression radar. Compared with SMSP jamming, C&I jamming is more similar to the radar transmitting signal, and more difficult to be suppressed. To solve this problem, a jamming suppression algorithm is proposed under the background of coherent radar countering C&I jamming. This paper studies the time-frequency characteristics of the jamming signal and the effect on coherent radar under the situation of stand-off jamming. On this basis, the jamming parameters such as position, amplitude, Doppler frequency, sampling period and sampling pulse width are estimated by joint processing in fast-slow time domain, and then the jamming signal is reconstructed. By subtracting the reconstructed signal from the echo, the purpose of jamming suppression is finally realized. The simulation results verifiy the feasibility and effectiveness of the proposed algorithm.