GPS Fine Time Delay Estimation Based on Signal Separation Estimation Theory

摘要：

　　The signal multipath effect is one of the main reasons which lead to positioning error in the Global Positioning System (GPS).Although the differential technology can improve the positioning accuracy,the differential GPS system still cant eliminate the positioning error caused by multipath signals,the reference stations and users being in different geographical environment.In the light of the GPS multipath signal model,this paper presents a GPS time delay estimation algorithm based on signal separation estimation theory.Firstly,Doppler frequency is estimated when the signal delay is unknown.Then,we use the estimated Doppler frequency to get signal delay information with signal separation estimation theory.In addition,we consider the previous estimated results as the initial value and a two-dimension optimization method is implemented in a small range for further improving the estimation accuracy.It can be shown from the simulation results that this method which is able to effectively eliminate the multipath has a better performance compared with the conventional method and narrow correlator spacing algorithm.

关键词： signal multipath time delay fine estimation signal separation estimation theory multipath mitigation

作者: Jie Li Renbiao Wu Wenyi Wang Dan Lu

作者单位: College of Electronic and Information Engineering, Tianjin University, Tianjin, China ;Tianjin Key L Tianjin Key Lab for Advanced Signal Processing, Civil Aviation University of China, Tianjin, China

会议类型: 国际会议

会议名称: 2012 IEEE 11th International Conference on Signal Processing (第11届IEEE信号处理国际会议)

会议地点: 北京

会议语种:英文

页码: 236-240

在线出版日期: 2012-10-21（万方平台首次上网日期，不代表论文的发表时间）