Research And Implementation Of Anti-jamming Technology Based On Digital Array

With the increasing complexity of the environment in which modern radars are located,and the gradual diversification of interference forms,the research on radar anti-jamming technology has become an important topic in modern radar design.Most of the current antiinterference technologies target a single type of interference,and cannot achieve the ideal interference suppression effect when multiple interferences coexist.This article will focus on the related technology of suppressing mainlobe and sidelobe interference in digital array radar.The main contents of this thesis are as follows:1.Based on the simulation of performance of the classical sidelobe cancellation and sidelobe blanking algorithms,an improved sidelobe cancellation scheme was proposed for additive mixed interference.Through simulation experiments,it was verified that the scheme could solve the problem that the blanking decision could not be correct because the distance spoofing interference was drowned out by the suppressed interference.2.The anti-jamming structure of super-resolution direction finding plus conformal adaptive beamforming is given,which can be used for the suppression of mainlobe interference and sidelobe interference at the same time.Based on the research of Multiple Signal Classification(MUSIC)algorithms,a joint estimation method of the angle of arrival of Fast Fourier Transform(FFT)and MUSIC Symmetric Compression Spectrum(MSCS)is proposed,which was verified by experimental analysis to reduce the time consumption by nearly 80%compared with MUSIC while maintaining the corresponding accuracy,solving the accuracy loss problem in classical fast superresolution direction finding.Based on the research and simulation of Blocking Matrix Preprocessing(BMP)and Eigen-projection Matrix Preprocessing(EMP)two mainlobe interference cancellation methods,an improved scheme is proposed to solve the problems left over in the traditional cancellation methods,such as the peak offset of the mainlobe,the influence of the sidelobe interference suppression by the mainlobe interference power,and the simultaneous suppression of the target signal.3.A digital array radar signal processor based on Huarui No.2 is designed.This radar has anti-jamming functions such as adaptive beamforming while completing conventional target detection.The software and hardware architecture of the signal processor is introduced and the design of the anti-jamming algorithm is given.Finally,the performance of the algorithm is verified by the software simulation results.