Research On Active Jamming Method Of Airborne Synthetic Aperture Radar And Its High Efficiency Implementation

Airborne SAR is a powerful imaging radar capable of reconnaissance of detailed battlefield information and real-time imaging.Its superior performance and increasingly widespread military applications have forced radar jammers to make effective responses to protect their own target facilities and military information security.This thesis mainly focuses on the research topic of the airborne SAR active jamming method and its efficient implementation,including the key issues of the weakness and the jamming paths to the airborne SAR,the active jamming method and its implementation based on FPGA.The main work and achievements of the thesis are as follows:1.From the working state of airborne SAR,the signal echo model of airborne SAR and the basic imaging principle are analyzed and studied.And then,the weak links of airborne SAR are discussed in terms of flight stability,pulse accumulation effects,signal time-frequency characteristics,carrier platform power,real-time imaging requirements,target environmental impact,and so on.2.In view of the weak links in airborne SAR work,the jamming paths to airborne SAR is analyzed from several perspectives of platform characteristics,signal characteristics,and target environment.Additionally,a certain analysis of the jamming power requirements is provided,which provides a basis for the research and implementation of airborne SAR active jamming methods.3.According to the characteristics of the airborne SAR signal and its jamming mechanism,the structure of the parallel inverse de-skewing jamming system is analyzed,whose basic working principle and implementation method is researched and the implementation based on FPGA is completed.4.Based on the similarity characteristics of jamming signals and airborne SAR signals,the convolutional noise jamming and intermittent sampling jamming and their improved method are analyzed and studied.Based on the jamming mechanism,the jamming performance is simulated and analyzed,and the efficient implementation of the related methods based on FPGA is completed.5.Based on the regional suppression jamming effect,the two traditional non-coherent jamming methods,noise FM jamming and comb spectrum jamming,are first discussed and analyzed.The ir principle and performance are analyzed and their FPGA implementation is completed.Then,the basic principle of the clutter-like jamming method are analyzed,and the related researches on its jamming performance and efficient implementation are carried out.