At last,the results were comprehensively analyzed to conclude that the best number of IGS tracking stations grouping with Great Wall station is 3.

Precision relative positioning by using precision star calendar and joint-measurement with IGS tracing station.;

Application of the Methods to Connect IGS Tracing Station in Improving the Accuracy of GPS Control Network Data;

Near real-time GPS meteorology research and application based on IGS ultra tracking stations;

Through an experiment this paper discusses the effects of the choice the space distribution(sourth-north earth, inside or margin of net, uniform distribution), quantity distribution(from 0 to 8 IGS stations) of IGS stations on the accuraty of solved result of the Beijing GPS network.

On client program design of data transmission for GPS tracking station;

Construction and data service of the GPS tracking stations system in Chian;

This paper,introduces the function and construction in studies of data transmission technology for GPS tracking station,giving a commentary to its present situation,indicating four developing tendencies,such as automation,multiple files,low cost and high safety,addresses equipment,software updating and a tentative plan to increase data exploitation rate for BJFS GPS tracking station.