Zhou Chao, Liu Feifeng, Liu Quanhua
Radar Research Laboratory, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China.
Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology), Ministry of Education, Beijing 100081, China.
Sensors (Basel). 2017 Oct 29;17(11):2480. doi: 10.3390/s17112480.
The interrupted sampling repeater jamming (ISRJ) based on a digital radio frequency memory (DRFM) device is a new type of coherent jamming. This kind of jamming usually occurs as main-lobe jamming and has the advantages of low power requirements and easy parameter adjustment, posing a serious threat to the modern radar systems. In order to suppress the ISRJ, this paper proposes an adaptive transmitting scheme based on a phase-coded signal. The scheme firstly performs jamming perception to estimate the jamming parameters, then, on this basis, optimizes the waveform with genetic algorithm. With the optimized waveform, the jamming signal is orthogonal to the target echo, thus it can be easily suppressed with pulse compression. Simulation experiments are performed to verify the effectiveness of the scheme and the results suggest that the peak-to-side-lobe ratio (PSR) and integrated side-lobe level (ISL) of the pulse compression can be improved by about 16 dB and 15 dB, respectively, for the case where the jamming-to-signal ratio (JSR) is 13 dB.
基于数字射频存储器（DRFM）设备的间歇采样转发干扰（ISRJ）是一种新型的相干干扰。这种干扰通常以主瓣干扰的形式出现，具有功率需求低和参数调整容易的优点，对现代雷达系统构成严重威胁。为了抑制ISRJ，本文提出了一种基于相位编码信号的自适应发射方案。该方案首先进行干扰感知以估计干扰参数，然后在此基础上，用遗传算法优化波形。利用优化后的波形，干扰信号与目标回波正交，因此可以通过脉冲压缩轻松抑制。进行了仿真实验以验证该方案的有效性，结果表明，在干扰信号比（JSR）为13 dB的情况下，脉冲压缩的峰旁瓣比（PSR）和积分旁瓣电平（ISL）分别可以提高约16 dB和15 dB。
