Research On Algorithm And Application For Compass Single Epoch Positioning

Beidou navigation positioning system which was independent research and development of our country,broke down the monopoly of GPS and also played an important role in politics,military affairs and national defense.While the precondition for promoting the B eidou system market was development of the applications.This paper focused on the applications of Beidou system researching and studying the principles and method of dynamical positioning.Referring to related algorithms of GPS single epoch positioning,algorithms fit for Beidou frequency single epoch positioning would be formulated.This paper compared the widely used GPS system and newly emerging Beidou system from system composition,constellation structure,coordinate system,time system difference,as well as the content and format of the received signal and other related ones concluding the differences and similarities to verify the feasibility of Beidou single epoch positining,analysed the principle and method of Beidou single epoch posining as well as the errors of the Beidou positioning process,chose the error correction model fit for Beidou system.The combination of Geometry-Free and M-W combination to solve the integer ambiguity and detection cycle slip was adopted.Mathematical model and system model of the single epoch positioning solution was established.Using the Kalman Filter algorithm solve Beidou single epoch positionin.Formulating the program BdTrack solve Beidou single epoch positioning.By simulating 1 and 100 cycle jump test,the method detecting the cycle slips of Beidou signal in this paper was verified.Effections of different length and the length of the baseline of Beidou single epoch positioning accuracy were analysed by the comparision of two sets of measured data.The main conclusions are as follows:In the 500 meters,the BDS data mentioned above had the calculation precision between 0.1~2cm which is better than GPS.In the 8000 meters test,the BDS data had the calculation precision between 0.4~1.5cm,which was the same level of GPS calculation precision between 0.4~1.5cm accuracy.In the 17 kilometers baseline test,BDS data had the calculation precision between 4.3~14.5cm,which was lower than GPS's centimeter level positioning accuracy.The measured data of 1HZ test implied that the longer time of observing the better accuracy.When the time of observing reached 30 mins,the positioning accuracy was millimeter to centimeter level.