Research On GPS Communication Link And Its Jamming Technology

Global Positioning System(GPS)is a typical application of satellite communication technology,it is widely used in navigation,measurement and time service.The role of GPS is more prominent in the military field,and it is increasingly becoming an indispensable key equipment for the army,which plays an important role in all aspects of the war.Based on this,this paper focuses on the GPS communication link and its jamming technology.Firstly,this paper introduces the basic principle of GPS communication link,structure of signal,and its jamming technology,and gives the mathematical analysis of the anti-jamming performance of GPS communication link.The influence of different bandwidth jamming signals on the performance of GPS receiver correlator is also studied.Secondly,this paper build the jamming platform of GPS communication links using Matlab/Simulink,including the simulation of GPS intermediate frequency satellite signal and software receiver.The acquisition and tracking loop of GPS software receiver is designed and simulated.Then,the characteristics of several typical jamming signals are analyzed.The influence of each jamming signal on the acquisition and tracking loop of GPS software receiver is studied.The effect of interference on the BER performance of GPS system is also analyzed by Monte Carlo simulation.Finally,in view of the continuous development of GPS anti-jamming technology and the poor effectiveness of the traditional single interference mode,two new interference modes based on composite interference are proposed.Simulation results show that composite jamming which based on Noise FM and repeater deception jamming can effectively interfere with GPS receiver with less power;another composite jamming which based on the weapon target assignment can be used to allocate a large number of jammer in a short time.