The interrupted-sampling repeater jamming (ISRJ) is an effective kind of intro-pulse coherent jamming based on digital radio frequency memory. It appears as a group of false targets that are difficult to distinguish on the range profile after pulse compression, which seriously affects the target identification and tracking. According to the coherence between ISRJ and real target echo and the waveform discontinuity caused by intermittent interception, a new method is proposed for ISRJ parameter estimation and jamming suppression based on block sparse recovery. To ensure the effectiveness of sparse recovery, the transmitted signal is divided into several random phase-encoded sub-pulses. Firstly, the pulse-number and time-delay of the received echo are estimated by block orthogonal matching pursuit. Then, the jamming slices are identified based on the sampling duty ratio and the Doppler frequency is estimated through matching. Finally, according to the parameter estimation results, the jamming slices are reconstructed to eliminate ISRJ. Numerical experiments in two typical scenarios have shown that this method can effectively suppress ISRJ. Especially in the scenario of high jamming duty ratio, this method exhibits good anti-jamming performance.

中文翻译：

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基于块稀疏恢复和随机相位编码的间断采样中继器干扰抑制

间断采样中继干扰（ISRJ）是一种基于数字射频存储器的有效脉冲内相干干扰。脉冲压缩后在距离剖面上表现为一组难以区分的虚假目标，严重影响目标识别和跟踪。针对ISRJ与真实目标回波的相干性以及间歇截获引起的波形不连续性，提出了一种基于块稀疏恢复的ISRJ参数估计和干扰抑制新方法。为了保证稀疏恢复的有效性，发射信号被分成几个随机的相位编码子脉冲。首先，通过块正交匹配追踪估计接收回波的脉冲数和时延。然后，根据采样占空比识别干扰切片，并通过匹配估计多普勒频率。最后根据参数估计结果重构干扰切片以消除ISRJ。两个典型场景的数值实验表明该方法能够有效抑制ISRJ。特别是在高干扰占空比的场景下，该方法表现出良好的抗干扰性能。