基于DRFM的雷达超前干扰技术

针对雷达接收机采用脉冲前沿抗干扰技术侦察目标的问题,提出了一种基于数字射频存储器(DRFM)的雷达超前干扰方法.利用高速ADC对雷达信号进行采样并转换为数字比特流,通过FPGA设计重频跟踪器,实现对雷达射频信号的跟踪预测,并完成对雷达信号的无失真存储和延时叠加处理,最终调制出与雷达信号具有相干性的超前干扰信号.结果表明,干扰信号超前于目标回波信号,并且具有欺骗与压制两种干扰效果,试验结果达到了预期效果.

Radar advanced jamming technology based on DRFM

Aiming at the problem that the pulse front anti-jamming technology is used to detect the targets in the radar receivers, a radar advanced jamming method based on digital radio frequency memory(DRFM)was proposed. The radar signal was sampled and converted into the digital bit stream with the high speed ADC, and the pulse repetition interval(PRI)tracker was designed with FGPA to achieve the tracking and prediction of radar radio frequency signal. In addition, the non-distortion storage and time delay superposition processing of radar signal were completed. Finally, the advanced jamming signal with the coherence of radar signal was modulated. The results show that the jamming signal is ahead of the target echo signal, and has both deception and suppression effects. The experimental results achieve the expected effect.