3ZumbergeJ F.,Heflin M B.,Jefferson D C.,et al. Pre-cise Point Positioning for the Efficient and Robust Analy-sis of GPS Data from Large Networks[J]. Journal of Ge-ophysical Research,1997,102CB3):5005-5017.
4LiuJingnan,Ye Shirong. GPS Precise Point PositioningUsing Undifferenced Phase Observation [J],Geomaticsand Information Science of Wuhan University,2002,27(3):234-240.
5Gao Yang,Shen Xiaobing. Improving ambiguity conver-gence in carrier-based precise point positioning [C]. IONGPS 2001,Salt Lake City,USA,2001:1532-1539.
6J. F. Zumberge,M. B. Heflin,D. C. Jefferson,hi.M.Watkins, F.H.Webb. Precise point positio2ning for the ef- ficient and robust analysis of GPS data from large networks[J].Journal of Geophysical Research,1997.
