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Three-dimensional Combined Processing of Regional GPS and Terrestrial Networks

ZHA Ming, OUYANG Gui chong (Xi'an Technical Division of Surveying and Mapping, Xi'an 710054,China)  
With the development of GPS and traditional surveying techniques, the combined use of GPS and traditional surveying techniques might be the optimal choice in many cases. Hence the research on the combination of GPS and terrestrial networks is important in applying GPS surveying technique. The paper studies the method of three dimensional combined adjustment of regional GPS and terrestrial networks, presents the corresponding functional models, and solves two key problems about the lack of astronomical latitudes and longitudes and the vertical refraction correction in the classical three dimensional adjustment. Besides, in order to save computer storage and reduce execution time, the authors suggest to use the variable band data structure storage and the algorithm for minimizing column profile of sparse symmetric matrices. Finally, the data processing software CPSTGD is briefly introduced.
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