Fitting GPS Height Anomaly Area And Modeling Studies

GPS navigation and positioning is famous for its wide applications easy to operate multi-function, high efficiency, all-weather and high-precision.GPS signals can be used in navigation of the sea, land and air, missile guidance, the precision positioning of geodetic and engineering surveying, the transmission of time and measurement of the speed, etc. The GPS system shows a very broad application space and prospects.However, the GPS geodetic height with high precision can not be directly applied to the actual production in engineering applications. So that the advantages of three-dimensional positioning of the GPS can not be put to good use, so, how to transform GPS height high-precision becomes a hot issue in surveying and mapping scholars.This paper begins with an overview of the development and research of the GPS. It introduces the concept of GPS height fitting, research and summarizes the variety of GPS elevation fitting models and methods. Introduction of cubic spline function and the definition and nature of the interpolation function, construction of cubic spline abnormal height function, get linear elevation abnormal fitting model; Then discussion remove-restore fitting method depth. Use its essence in the single fitting model in order to establish a mixed fitting model; And starting from the definition of the right and the weighted significance, combining with the single fitting model, and build the weighted consolidated model of GPS elevation fitting; Finally, with three typical examples of the establishment of the model to be verified, examples of calculation results show that the model is reliable, and with good fitting precision, this has great significance for practical application of the GPS elevation project.