Study On Time-Frequency Cross-Product Deceptive Interference Method Of Waveform Agile SAR And GMTI

With the continuous development of Synthetic Aperture Radar(SAR)technology,various of SAR with excellent performance emerges endlessly.The anti-interference performance of SAR-GMTI and waveform agile SAR is more prominent.SAR-GMTI combines high-resolution SAR with ground moving target indication(GMTI)to filter out stationary target echoes and stationary false target interference,which poses a serious threat to ground moving targets.Waveform agile SAR(WA-SAR)utilizes interpulse waveforms parameter agile technology,making the traditional transimitting interference unable to achieve the desired interference effect.Due to its excellent battlefield detection and anti-interference performance,the WA-SAR/GMTI has become increasingly prominent in the military and has become a research hotspot in the field of military confrontation.Based on the above background,this paper deeply studies the interference method of WA-SAR/GMTI.The first chapter introduces the topic background and research significance of the topic: it expounds the current research status of the current WA-SAR/GMTI technology and system,and summarizes the current interference methods and existing problems for the WA-SAR/GMTI.The main work of this article is planned in this chapter.The second chapter summarizes the common anti-interference principle of WA-SAR and SAR-GMTI,and analyzes the relationship between its anti-interference performance and parameter setting.Through some conventional interference methods,The anti-interference ability of the WA-SAR and SAR-GMTI is verified by simulation.In the third chapter,the signal model of time-frequency cross-product modulation interference,the processing flow of SAR receiver and the influence of different interference parameters on the interference effect are summarized.The simulation results are given.Then a motion false target generation method based on time-frequency cross product modulation is proposed and a signal model is established.Taking the three-aperture interferometric SAR as an example,the simultaneous interference effect of SAR/GMTI is deduced,and the influence of the interference parameter setting on the interference effect is determined.The influence of the reconnaissance error on the performance indexes such as the false target coordinates and the broadening amount is theoretically analyzed.Finally,the feasibility and effectiveness of the interference method for SAR/SAR-GMTI simultaneous interference are verified by simulation experiments.The fourth chapter proposes a time-frequency cross-product interrupted sampling transmitting interference method,which can form a flexible and controllable realistic false target deception jamming.The WA-SAR for two different signal systems: the chirp rate polarity agile and random agile proposed corresponding improvement schemes,and established the signal model respectively,and gave the signal processing flow of the composite interference signal at the SAR receiving end.The imaging results are analyzed,and the influence of the introduced intermittent sampling on the interference effect is analyzed.The method of improving the interference effect is proposed.The influence of the reconnaissance error on the position and size of the false target is theoretically analyzed.Finally,the theoretical derivation results are verified by simulation.The last chapter summarizes the work and innovations in this paper,and discusses the work direction of the next step.