Journal of Systems Engineering and Electronics ›› 2009, Vol. 20 ›› Issue (5): 954-961.

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

GPS short-delay multipath estimation and mitigation based on least square method

Zhang Shengkang1,2, Wang Hongbo1,2, Yang Jun1,2 & He Leiming1,2   

  1. 1. Beijing Inst. of Radio Metrology and Measurement, Beijing 100854, P. R. China;
    2. National Key Laboratory of Metrology and Calibration Technology, Beijing 100854, P. R. China
  • Online:2009-10-22 Published:2010-01-03


The GPS multipath signal model is presented, which indicates that the coherent DLL outputs in multipath environment are the convolution between the ideal DLL outputs and the channel responses. So the channel responses can be estimated by a least square method using the observed curve of the DLL discriminator. In terms of the estimated multipath channels, two multipath mitigation methods are discussed, which are equalization filtering and multipath subtracting, respectively. It is shown, by computer simulation, that the least square method has a good performance in channels estimation and the multipath errors can be mitigated almost completely by either of the methods. However, the multipath subtracting method has relative small remnant errors than equalization filtering.