Array-based Gps Anti-jamming Algorithm And Performance Assessment

GPS satellite navigation system is widely applied in the civil and military fields, China's "Compass" satellite navigation system is also under comprehensive construction. Today many countries are investing substantial resources to begin research in weapons system platforms of jamming enemy's satellite navigation and positioning system, in order to make one's own conflict may arise in the future against the initiative in a favorable trend. Therefore, the study of GPS anti-jamming technology has important long-term significance.This paper introduces the principle of GPS receiver. The composition of the satellite signal: navigation information, GPS carrier frequency, and pseudo-random C/A code. Research the order acquisition and frequency-domain FFT acquisition. Simulation of the pseudo-random C/A code generation process, and through the frequency domain FFT acquisition algorithm simulation the research captured GPS satellites.Adaptive interference rejection for GPS receivers based on a study of the theory. Presented three adaptive anti-jamming algorithm based on uniform linear array: spatial LCMV algorithm, space-time MVDR algorithm and CSA-MWF, LCMV spatial structure of the algorithm is simple and easy to achieve, but has the poor weaknesses of low immunity freedom, anti-jamming performance, space-time MVDR algorithm can inhibit a variety of anti-jamming performance and interference, and not only to suppress interference in spatial orientation, but also in the frequency domain interference suppression. However, pace-time algorithm for computing the large amount can not be easily achieved, The paper propose a structure based on multi-level correlation subtraction Wiener filtering algorithm that slightly lower in anti-interference performance, significantly reduce the amount of computation.In-depth study of the GPS receiver system, proposes a GPS anti-jamming receiver module. The hardware platform consists of antenna arrays, RF front-end receiver module, FPGA IF-digital down converter modules, and PC machine. Adding to single-frequency interference, wideband interference, mixing interference, the hardware system suppresses interference and capture GPS data. Three algorithms and analyze the output data flow interference, SINR output than to improve the situation. Finally, the output of the anti-jamming GPS was captured to obtain a clear correlation peak to verify GPS anti-interference can be implemented.