The Research On GPS Elevation Abnormal Fitting

GPS is the technology of radio navigation and localization which takes the satellite as the foundation and emerges along with the modern science development it can provide three dimensional coordinates of space point, the speed of surveying object and the time for each kind of user, In recent years, along with the technical rapid development as well as the American Government SA policy gradually cancellation and appearing of a series of measure method, furtherly with the improve of the navigation localization technology of GPS in precision, reliability and stability ,it has more and more widespread application in ours daily life.However, GPS also has its deficiency in the elevation pointing accuracy aspect, Because the geoid is an irregular curved surface, it is unable with an essence accurate curved surface to simulate, this enables GPS only to provide for us the accuracy of the geoid height, but is not the normal height in our project needs. So it has seriously affected the three dimensional localization application development of GPS and makes the superiority of providing the three dimensional coordinates not to be able to obtain the full display .This article introduced GPS principle of work as well as the concept of the GPS geoid height, normal height and orthometric height and three mutual relations, elaborated the principle of GPS standard (GPS elevation fitting), in the collection, the consult, has analyzed in the last few years domestic and foreign in view of the GPS standard high research technique and the application technology. The collection, the consult, has analyzed in the last few years domestic and foreign in view of the GPS standard high research technique and the application technology, After the collection, consult, and analysing in the last few years domestic and foreign in view of the GPS standard height research technique and the application technology, and in the foundations of these research results, in view of the characteristic of our country broad national territory area, the complex terrain especially and the quite major fluctuation resembles geoid, uses the many kinds of fitting method to carry on the fitting to the resembles geoid, In order to increase the interpolation precision, introducing the least squares theory .finally with the known data to use several fitting methods to carry on the fitting separately. Through carries on the synthesis to these fitting model to compare and to analyze the research, has given the different terrain different fitting model precision appraisal, and proposed the concrete conclusion and suggestion. Through the fitting result analysis to indicate that: under the controlled condition, the result which with many kinds of...