Research On Navigation Signal Receiving Technology Based On Cooperative Anti-Jamming

In recent years,the importance of satellite navigation systems grows with times in civil and military fields,but the satellite signal is weak and vulnerable,and the problems of various intentional or unintentional interferences are more obvious,especially in artificial jamming and spoofing,therefore,effective technology of satellite signal antijamming is imminent and that is of great significance to improve the anti-interference ability of the receiver.In this article,we research the broadband jamming in navigation signal receiving and narrowband interference,analysis a series of current mainstream anti-jamming technologies,provide a comparative study of the space-time adaptive anti interference algorithm from the spatial adaptive interference and adaptive interference.Compared to the poor effect and limited target of the pure airspace or time domain interference suppression,the space-time adaptive anti-jamming algorithm makes up the problem of the spatial freedom of the apatial adaptive anti-jamming algorithm,and the ability of Time Domain Adaptive Anti-jamming algorithm to restrain the wide band interference.The research is given from the following aspects:First of all,based on GPS satellite navigation system,Beidou navigation satellite system,GLONASS satellite navigation system and Galileo navigation satellite system,this paper introduces the basic principle of receiving and positioning satellite signal emission,analyzes the basic composition of the navigation signal which gives a basic explanation and analysis of the introduction of this principle and process of collaborative reference signal,set up according to the spatial and temporal respectively interference suppression algorithm for the model,and on the basis of adaptive interference suppression algorithm for the spatial and temporal process are explained and deduced,anti-jamming algorithm for spatial and temporal conditions of several typical conditions,with the introduction of cooperative signal simulation algorithm comparison,find out the reasons.Secondly,study the principle and structure model of space-time adaptive anti jamming algorithm,establish the related algorithm from the following six main respectively,Sample Matrix Inversion algorithm based on cooperative signal(SMI),Minimum output power algorithm with single star Constraint(MinC),Minimum output power algorithm with single star Unconstrained(MinU),the Minimum output power algorithm with Multi satellites Constraint(MinMC),Principle Components(PC),and Maximum Signal to Jammer-plus-Noise Ratio(MSJNR),verify the space-time adaptive anti jamming algorithm has better anti-interference ability than the simple spatial or temporal domain anti-jamming algorithm.This paper is based on the MATLAB simulation platform,analyse various algorithms for space and time domain and space-time adaptive filter by setting parameters of signals,including interference signal,desired signal,reference signal and noise signal.The performance analysis is mainly through the evaluation of output SJNR,aiming at the complex electromagnetic environment in the electromagnetic field especially in the military navigation equipment,we propose to introduce other receiver signal as reference signal innovatively,make the realizing technology simple and advantage obvious,lay the foundation for the realization of the ground receiving signal network,the sharing of signal resources and the common goal of suppressing interference.