Precise Point Positioning Delay Correction Model

With development and progress of GPS Positioning Technology, its application field has been used more and more widely, at the same time the requirement of accuracy is higher and higher, and currently differential positioning operation cost is high, working efficiency also gradually cannot satisfy the need of some areas, the precision of traditional single point positioning is low, so the un-difference Precise Point Positioning (PPP) technology in recent years become a new hotspot and difficulty in the GPS research field. Precise Point Positioning is the user using a single dual-frequency GPS observation data collection, and add the precise ephemeris and precise clock to precise position, the key technology of precise point positioning is to eliminate signal transmission error of the delay. Current characteristics of signal propagation atmosphere is uncertain, only to eliminate by traditional model correction. To solve this problem, this paper has been studied deeply; improve efficiency of delay error correction model, thereby eliminated influence of delay error on the precise point positioning influence.First this paper introduced the basic principle of precise point positioning, the general method of dealing with error, analyzes the error correction of delay basic method and the traditional model, the average ionosphere method has been used to eliminates ionospheric delay, improve Hopfield model, then comparison analysis the results of the traditional delay correction model, obtains the feasibility of the new model. To further verify the accuracy and feasibility of precise point positioning, the paper selected three different regions of the experimental observations. This paper has been used Visual C++6.0 compiling settlement software to realize the calculation process, and the calculating process convenient and quick.