MULTIPATH ERROR ESTIMATION AND ITS IMPROVED
ALGORITHM FOR CHINESE IGS STATIONS
1)College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054
2)State Key Laboratory of GeoInformation Engineering, Xi’an 710054
3)Xi’an Research Institute of Surveying and Mapping, Xi’an 710054
Abstract Code Minus Carrier method can be used to estimate the primary multipath error in a certain accuracy level. Howerer there is still strong noise in the esitmated results of multipath. In order to solve the problem, Least Mean Squares（LMS） method is proposed for filtering the primary multipath error by setting appropriate filter length and stepsize parameter. Taking the advantage of repeating feature, LMS method can separate real multipath error from the estimated serial effectively. The numerical example shows that multipath effect can be reduced significantly and the percentage of multipath error correction can reach more than 80%, which will provide accurate model correction for navigation and positioning of user.
