4Zumberge, J E, M B Heflin, et al. Precise point positioning for the efficient and robust analysis of GPS data from large networks [ J ]. Journal Geophys, 1997,(3) :5005 ～5018.
5Geoffrey Blewitt, GPS data processing methodology:From Theory to Application [ J ]. GPS for Geodesy,Spring - Verlag, Berlin, 1998,231 ～ 270.
6Han S C, J H Kwon, C Jekeli. Accurate absolute GPS positioning through satellite clock error estimation [ J ].Journal of Geodesy, 2001, (75) :33 ～43.
