Technical Research On High Precision Positioning Technology Of Navigation Receiver

High precision navigation position is an important research direction in the satellite navigation system.It has an extremely important application in fields of geodetic survey,precision agriculture,position service,national defense construction and other fields.Satellite navigation system is widely applied for its global,real time and high accuracy features.The positioning accuracy of ordinary navigation receiver ranges in meters level while the positioning accuracy of high precision position can achieve centimeters even millimeters level.Only the users acquire the high precision position result can they continue to complete the following work.The high precision position result obtained effectively is extremely meaningful to improve the navigation position in the future.This paper focuses on the research of high precision positioning algorithm based on carrier phase differential technique in satellite navigation terminal.Based on the analysis of carrier phase differential localization principle,the carrier phase differential model is studied in depth.In order to solve the problems that the baseline length is increasing,the correlation between the base station and the user station is weakening and the positioning error is increasing,a mathematical model based on the general position is proposed and the rough positioning model is derived.High precision positioning result is obtained by eliminating the common error between the user station and the base station,and correcting the unit observation vector.The differential model is simulated and verified by MATLAB.Ambiguity of whole cycles,the critical quantity in carrier phase differential technique,is calculated by LAMBDA algorithm,and then the reason of cycle slip in the carrier phase differential location is summarized,and the treatment method happened after the cycle slip is given.The algorithm of carrier phase differential localization is achieved,which indicates that it can achieve high precision positioning under the premise of ambiguity of whole cycles resolved successfully.Positioning accuracy can reach the centimeter level.