Research Of Narrowband Anti-interference Technologies In Satellite Navigation

In this paper,the narrow band anti jamming technology in satellite navigation system is mainly researched.At first,the basic situation of the current satellite navigation and the development of anti jamming technology are introduced,including of analysis of the narrowband anti-jamming technology,in the frequency domain anti-jamming FFT transform domain anti-jamming,anti interference in time domain adaptive filter anti interference technology.Analysis is pointed out that with the calculation precision,frequency algorithm has the advantages of anti-interference of transform domain,to achieve relatively simple in engineering application,but will also have to signal attenuation,frequency interference is eliminated when the flaws of the FFT algorithm itself will also affect the algorithm the actual implementation effect;adaptive filtering algorithm for interference the selected time domain,which is the core of the IIR type filter parameters,in the existing research papers,usually generated by adaptive method.This method is actually a feedback control process,with the feedback control problems,such as the difficulty in choosing the actual use of normalized,feedback delay and other issues.The time-frequency domain combination anti-jamming,the two advantages of anti-jamming is selected,avoid the disadvantage impact on performance.At the same time in the FPGA hardware implementation and embedded into the existing satellite baseband algorithm,the algorithm of the software simulation and hardware realization and experiment verification,and ultimately achieved the narrowband anti-jamming performance is better than 85 dB signal to interference ratio of anti-jamming performance,and completed the test and verification.