SAR Jamming Analysis And Countermeasure Research Based On Game Theory

Synthetic Aperture Radar(SAR)has many advantages such as all-time and all-weather working,long-distance working mode,high-resolution imaging and certain surface penetration capabilities,so it plays an important role in military fields like battlefield reconnaissance,precision guidance and civil fields like geographic mapping and environmental monitoring and so on.With the wide application of SAR,SAR jamming and countermeasure technology has gradually become a hotspot in the field of electronic countermeasures and radar signal processing.SAR active jamming often suppresses the detection and imaging capabilities of SAR through high-power barrage jamming or falsetarget deceptive jamming.SAR anti-jamming means using some resource information of space-time frequency of SAR to do damage to SAR jammer to obtain high-resolution radar images in the detection area.The development of SAR jamming and SAR countermeasure technology is a process of shifting.The emergence of new SAR jamming technology will promote the development of SAR anti-jamming technology,and the emergence of new countermeasure technology will also promote the development of SAR jamming.Therefore,the process of SAR confrontation is a typical process of game theory.It is of great theoretical significance and application value to do research on theories and methods of SAR confrontation based on game theory.The thesis will start from the basic principle of SAR and SAR jamming and research the typical SAR interference methods and SAR antijamming methods.What's more,this thesis will establish the SAR confrontation model based on game theory and construct the SAR confrontation payoff function and get the optimal countermeasure strategy of both sides.The main work and innovation of the thesis are as follows: 1.Introduce the SAR imaging method and classic SAR interference method in detail to provide a theoretical basis for the following-up SAR confrontation analysis.Firstly,the SAR imaging geometry and signal model are established and the principle of SAR imaging is introduced.SAR Range-Doppler imaging algorithm is analyzed in detail and imaging simulation of point targets and analysis are demonstrated.Secondly,according to the different degrees of coherence of SAR interference,typical SAR jamming methods such as non-coherent interference,coherent interference and partial coherent interference are modeled and analyzed.Finally,the theoretical analysis and simulation results of different types of jamming are given in here.2.In terms of characteristic of SAR barrage jamming and deceptive jamming,this thesis comprehensively does research on SAR anti-jamming methods.SAR anti-jamming methods such as typical side lobe cancellation method,frequency domain notch method,timefrequency domain notch method,narrow band interference suppression based on EigenSubspace filtering method,regular frequency hopping method and inter-pulse random frequency modulation ratio methods are introduced in detail from the perspectives of space domain,time domain and frequency domain.At the same time,different simulation based on different anti-jamming methods are demonstrated in here.3.In terms of the question that SAR payoff function can hardly be represented.This thesis puts forward the construction method of SAR countermeasure payoff function and applies this function to different SAR game theory models and gives different equilibrium solutions under different game theory models.Firstly,the history,the concept and the important elements of game theory are introduced in this thesis.Secondly,SAR payoff function is established from the viewpoints of effect and efficiency.Then,this thesis establishes SAR countermeasure complete information static game,SAR countermeasure complete information dynamic game,SAR countermeasure incomplete information static game,SAR countermeasure incomplete information dynamic game models.Ultimately,in terms of diverse game theory models,this thesis uses simple strategy,maximum and minimum criteria,linear programming or many other suitable rules to obtain best strategy in SAR confrontation.