The Jamming Reasearch Against Spaceborne SAR Using FDA

Space-borne Synthetic Aperture Radar(SAR)is an advanced microwave equipment of observating ground.It has been more importantly in the military filed and has effectively expanded the field of radar electronic countermeasures due to the advantages of all-day and all-weather.The research of SAR deceptive jamming is more and more hot because the development of digital radio frequency memory(DRFM).Based on the study of the properties of the frequency diverse array(FDA),a novel deception jamming method of space-time-frequency is proposed in this thesis.The main research work of this thesis is summarized as follows:1.This thesis first introduces the basic principles of FDA,SAR and the methods of SAR jamming.The basic principles and properties of FDA are explained;We prospect the possible future research areas of the FDA.Besides,we give the conclusion of the value and the application prospect of this thesis.The principle of SAR has been introduced.The basic methods of suppression interference and deception jamming are analyzed and some simulations are done.2.This thesis presents a deception jamming technology,which is spaceborne SAR repeating phase-shifting jamming using FDA.We establish a mathematical model of SAR repeating phase-shifting jamming using FDA;Nextly,we derive range-Doppler algorithm using this methods which followed by the analysis of jamming performance in the range direction,azimuth direction and interference-to-signal ratio.The relationship between the frequency offset and the number of FDA in the SAR deception jamming is obtained.We analysed the numerical simulation results using the method of controled variables,which are the number of array elements and the frequency offset value.The numerical simulation results verify the correctness and validity of the proposed method.3.This thesis presents another jamming method,which is spaceborne SAR scattered wave jamming using FDA.The establishment of space-borne SAR scatter-wave based on FDA has given;Nextly,we derive the mathematical model of above method followed by the range Doppler algorithm using this method.We analyze the jamming performance of space-borne SAR scattered wave using FDA in range and azimuth directions and the ratio of jamming-to-signal.In this thesis,we analyze the numerical simulation results using method of controlled variables,which are the frequency offset and the number of array elements of FDA.The correctness and efficacious of the proposed method has been proved by the simulated experimental results.