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《Science of Surveying and Mapping》 2015-01
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An algorithm of eliminating Doppler frequency shift in highly dynamic circumstance for spread spectrum code acquisition

ZHANG Zhi-fu;PEI Jun;National Astronomical Observatories,Chinese Academy of Sciences;  
Satellite signal transmission is always in high dynamic environment.The larger carrier Doppler shift will greatly increase the spreading code acquisition time,and even cause capture errors in highly dynamic environment.The paper analyzed the effects of carrier Doppler shift on correlation peak of matched filter.According to the signal transmission characteristics of BPSK direct sequence spread spectrum communication system,the paper proposed an algorithm of second derivative-based Doppler elimination with derived processing,and a rapid PN code acquisition program was given then.Additionally,the performance of the algorithm was deduced.Finally,the simulation results showed that the algorithm would be correct,and have the algorithm bias much smaller than200 Hz when SNR value reaches down-46 dB.
【Fund】: 国家“863”计划项目(2007AA12Z343)
【CateGory Index】: P228
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