Gps Signal Modeling And Empty Anti-jamming Technology Research,

In modern society, the detection of location is used very extensively, whether the military field or civilian field. With the development of society, the demanding of position precision is increasing. Meanwhile, with the more widely used of radio, the interferences which disturb GPS signal are also increasing. Therefore, it is more and more important to improve the anti-jamming performance of GPS receiver.In this thesis, the model of GPS signal and the models of some usual interference are introduced, simulated and verified firstly. The modeles of GPS signal include C/A code generation and navigation message. The modeles of interferences include noise AM interference and noise FM interference.Secondly, the scheme of for-channel adaptive anti-interference GPS receiver and the basic principle of adaptive anti-interference are introduced. Then the optimality criterias are studied. Simulation of a traditional algorithm to restrain the oppressive interferences and a STAP processing method are accomplised, and the performances of the two methods are compared.Finally, the multistage nested wiener filtering (MWF) algorithm with low computation load is analyzed. However, while the anti-jamming capability improvement through STAP, the computational complexity of MWF increases greatly. A simplified MIRR algorithm is deduced and the computational complexity is reduced significantly.