The Research Of Single Point Positioning Based On GLONASS System

With the constant improvement of the GLONASS system and the increasing demand for high-precision positioning services, GLONASS system is increasingly able to play its role, such as multi-system navigation. C urrently, the accuracy of pseudorange single point positioning and precise point positioning between GLONASS and GPS system is almost at a same level. Therefore, GLONASS system will have great application prospects in the high-precision navigation and positioning.This paper systematically stud ies the single point positioning, especially precise point positioning based on the GLONASS system. The main contents include: the use methods MW, GF and dual single-P in the cycle slip detection and repair ing of the phase data; gross error detection and removal; carrier phase smoothed pseudorange processing; the solving of initial ambiguity; the determination of satellite broadcasting and precision orbits, the acquisition of precise satellite clock data; the determination of GLONASS satellite frequencies; the calculation of satellite velocity; the various model error correction and so on. In this paper, two method s are used to estimate the unknown parameters, namely the sequential adjustment and kalman filtering. In this paper, the measured data were processed and analyzed based on the Matlab R2009 a language platform. Besides, the accuracy of results calculated were evaluated, the result shows that the accuracy of single point pseudorange positioning is less than 5m, and the accuracy of precise point positioning is about 10 cm.This paper uses precise ephemeris data provided by IGS and the mixed observation data from station BJFS, GLONASS and GPS systems are different in some aspects, which has brought some difficulties to GLONASS positioning. In this paper, the key issues are as follows:(1) The reference unity of time and coordinates for GLONASS and GPS systems;(2) Cycle slip detection and repairing and the determination of initial ambiguity;(3) The determination of GLONASS satellite channel number;(4) Kalman filter algorithm;...