Multi-Pulse Radar Detection Method Against Time-Modulated Deceptive Jamming

In this paper, a multi-pulse radar detection method against time-modulated deceptive jamming is proposed. Time-modulated deceptive jamming for the radar using linear frequency modulation (LFM) signals has become a research hotspot in radar countermeasures due to the advantages of its simple structure and strong self-adaptive capability. The jamming signal generated by time modulation exhibits the same time-frequency characteristics as the true echo signal, thereby enabling it to obtain the same cumulative gain, which makes the processing results containing multiple false targets after pulse compression. However, after pulse compression of LFM signals with different LFM slopes, as the radar adopts multiple pulses with different LFM slopes, the energy focusing on the false targets' location will be disrupted due to the mapping relationship of time-frequency domain, and that of real target will still be accumulated. Based on this characteristic, in this paper, by sequentially transmitting LFM signals with different LFM slopes, pulse compressing their echo signals and combining and analyzing the pulsecompressed signals, the false targets' energy can be significantly reduced and real target's energy can be effectively saved. To verify the effectiveness of the anti-jamming method, several simulation results considering multi-jamming parameters are provided.