Research On Anti-Jamming Performance Of Bistatic SAR

In the military field,radar often faces challenges with various jamming environments.Compared with the traditional single synthetic aperture radar(SAR),bistatic synthetic aperture radar(BiSAR)shows strong adaptability and survivability in the complex jamming environment because of its special configuration characteristics.However,at present,there are few research results on the anti-jamming of double base system,which can’t provide theoretical support for the anti-jamming engineering practice.Therefore,this paper aims to study the anti-jamming performance of BiSAR,which includes the anti-j amming advantages of the BiSAR system and the new methods of interference suppression for BiSAR system.The significance of the research is to improve the anti-j amming theory of BiSAR and provide theoretical support for the anti-jamming engineering practice of BiSAR.The main work of the paper is summarized as follows:1.The anti-jamming effect of BiSAR in suppression jamming environment and deception jamming environment is studied.The jamming models of BiSAR are built under the jamming environment of suppression and deception respectively by analyzing the process of interference generation and propagation,which aims to analyze the anti-jamming mechanism of double base system.2.It has studied the effects on the anti-jamming performance of BiSAR from the system configuration.BiSAR system configuration possess the features with "same/different side”and“same/different height”.Furthermore,the BiSAR system with "different side"characteristics has better anti-jamming performance than the BiSAR system with "same side" characteristics.BiSAR system with "different height" can enhance the concealment of radar transmitter by reducing the distance of radar reciever and target.Meanwhile,the interference power entering the radar receiver will also increase.3.An anti-jamming performance evaluation method of BiSAR Based on immune ground jammer area is proposed.In order to quantitatively evaluate the influence of the system configuration on the anti-jamming performance of BiSAR,the concept of immune ground jammer area is proposed.When the jammer does not know the radar working system,there is an immune ground jammer area for a BiSAR system configuration,and the jammer in this area cannot effectively interfere with the BiSAR system.Therefore,The anti-jamming performance of BiSAR system can be quantitatively analyzed by mapping the area of immune ground jammer.4.A method of interference suppression based on spatial filtering and interferece location of BiSAR is proposed.BiSAR has more observation angles than single SAR,which satisfies the basic conditions of triangulation.Also,BiSAR can obtain the precise position of jamming source by triangulation principle and DOA estimation.Moreover,it is able to realize spatial filtering by beam zero control and obtain the echo without jamming.