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GPS Multipath Mitigation Algorithm Using C/A Code Correlation Character

  • Jie Li
  • Yuliang Li
  • Yingwu Zhou
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 246)

Abstract

The effect of signal multipath is one of the main reasons which lead to positioning error in Global Positioning System (GPS). Although the differential technology can improve the positioning accuracy of the navigation system, but the reference stations and users being in different geographical environment, the differential GPS system still can’t eliminate the positioning error caused by multipath signal. In the light of the characters of GPS multipath signal model, a GPS multipath mitigation algorithm based on C/A code correlation character is proposed in this paper. Firstly, Doppler frequency is estimated when the signal delay is unknown. Then, we use the estimated Doppler frequency to get signal delay information with C/A code correlation character which is realized by correlating the reconstructed zero delay signal with the original signal. In addition, we consider the previous estimated results as the initial value and a two-dimension search method is implemented in a small range so as to further improve the estimation accuracy. It can be shown from the simulation results that the proposed method has a better time delay and Doppler frequency estimation performance compared with the conventional method and narrow correlator spacing algorithm.

Keywords

Global positioning system Multipath mitigation C/A code correlation character Improve the estimation accuracy 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  1. 1.Department of Physics and Electronics Information EngineeringMinjiang UniversityFuzhouChina

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