Implementation of GPS long baseline data processing

GPS long baseline data processing is widely used in geodesy and large-scale precise engineering surveying.International high-precision GPS data processing software,such as GAMIT,can satisfy the precision requirement of the long baseline data processing,but the processing procedure is complicated and the user must be familiar with the knowledge of GPS theory.In the paper,GPS long baseline data processing software was designed and realized,based on studying the influences of the important factors in long baseline data processing,and methods of eliminating the errors in GPS measurements,with the graphic user interface programming.Experiments with different baseline lengths were carried out,and the results indicated that the proposed software could resolve GPS data with the baseline length up to thousands of kilometerd,and the precision of the resolved baseline reached the same level of GAMIT solution.The proposed software provided a convenient and feasible approach to realize the long rang and high-precision GPS data processing,with a high automation level and easy usage.