Multi-channel Gps Anti-jamming Receiver Design And Realization

GPS technology has been widely applied in both military and civilian areas, such as navigation, target positioning and precision attack weapons. Anti-jamming performance is required for GPS receiver under the continuous requirements of the GPS positioning accuracy improvement. The space-time adaptive anti-jamming processing algorithm can effectively inhibit kinds of interferences, so this techique can greatly improve the anti-jamming ability of GPS receiver.In this thesis, firstly, the main types of GPS interference and the corresponding anti-interference methods are introduced, the wideband and narrowband interferences are modeled, the principle of the STAP algorithm and the optimality criteria are studied, and the multistage nested wiener filtering algorithm with low computation is analyzed. Secondly, the hardware design of GPS receiver intermediate frequency (IF) anti-jamming circuit is completed, and the anti-interference algorithm is implemented based on the FPGA and DSP in this cirtuit. Thirdly, the complete anti-interfernce system has been constructed and debuged jointly with the experimental results analysises. The efficiency of the anti-interfernce algrithm is verified by experiment results. At last, the shortcomings of the system are given and the worthwile topics are proposed for future research.