Research On Anti-deception Jamming Technology Of Airborne SAR

Synthetic aperture radar(SAR)has its unique characteristics compared with traditional radar,high resolution imaging can still be performed in dark and bad weather conditions.Because of its penetration and all-weather characteristics,it has been widely used in military and civil fields.For example,electronic countermeasure(ECM)is becoming more and more prominent in the field of modern military affairs,synthetic aperture radar plays an important role in space surveillance,at the same time,in order to protect the target object from detection and observation,various jamming and anti-jamming technologies have appeared for SAR system,because SAR system has high processing gain,its jamming is more difficult than conventional radar.In nowadays,the jamming and anti-jamming technology of synthetic aperture radar(SAR)have a wide range of research and application prospects in the field of SAR countermeasure.The main content of this paper is the research of jamming and anti-jamming for SAR system.The specific contents are as follows:Firstly,this article introduces the basic principle of SAR imaging detailed,establishing geometric model to discuss how to obtain high resolution imaging.Use the traditional Rang Doppler(RD)imaging algorithm to simulate the imaging of point targets,introduce the basic principle of phase recovery,and study the Oversampling Smoothness(OSS)algorithm which is different from the traditional imaging algorithm.Secondly,anti-jamming is studied for deceptive jamming.According to the established direct deception jamming model to analyse the system response function of jammer,the expression of SAR echo signal with interference is derived.Principle of non-uniform sampling and phase recovery,puts forward a imaging algorithm which combines non-uniform sampling and OSS algorithm,the effectiveness of the algorithm is verified by simulation experiments.Finally,this article studys the basic principle of scattering deception jamming and jamming signal model of SAR,by analyzing the imaging of the perturbation target and its characteristics as deceptive jamming,aiming at this problem,a method of interference suppression based on phase recovery is proposed.The effectiveness of the algorithm is verified by simulation experiments.