Research Of GPS Control Net In Data Processing

With the development of GPS technology, measures and theories of GPS data in processing have made many fruits. There are much mature software overseas, such as Bernese software of Bernese university, GAMIT/GLOBK software of MIT, EPOS.P .V3 of Germany GFZ and GIPSY of American JPL and so on. In our country, Tongji university has publish TGPPSW and TGPPSm software from the model was proposed by Pro.Dajie Liu and WuHan university has produced GPSAdj and PowerAdj software too. However, it is important of selecting fit ways of GPS data processing because old control nets are different condition in different areas, especially GPS control nets.In the first, this paper beginning with the special three-dimensional linear modal about coordinate transition, describes several coordinate transitions and difference between coordinate transition modals are only used in small angle and two kinds of non-linear modals are used in any angle. In the second, the paper discusses the basic adjust theory about GPS control net without limited and coordination transition from WGS-84 coordination to local coordination. In addition, the paper analyses GPS control net adjust theory with limited in country coordination and in local coordination through El ellipse. So, all leads to a set of integrated measures about GPS control net data processing and GPS adjustment software.In the end, the paper describes inner function of software and how to use it, and proposed new GPS control net adjustment modal which is able to be used any condition.