Study Of BDS/GPS Dual Frequency RTK Algorithm And Software Implementation

With the rapid development of the Beidou satellite navigation system (referred to as BDS-BeiDou Navigation Satellite, Beidou system), Beidou system gradually began to provide with all-weather, all day long, high precision positioning,navigation and timing services for the Asia Pacific region and the world. Real-time acquisition of high precision point coordinate is one of the important aspects for the Beidou system application, RTK technology is a conventional technology to obtain high accuracy point coordinates, so the use of the Beidou system for RTK positioning has become a research hotspot. Admittedly, there is still a gap between the Beidou system and GPS, but the Beidou system has its own advantages, so this paper focuses on the research of BDS/GPS dual frequency RTK algorithm. This paper verifies the accuracy and reliability of BDS/GPS RTK positioning through the post RTK, static real-time RTK, handset real-time RTK experiment. The main research contents include:1. This paper focuses on the research of BDS/GPS dual frequency RTK positioning algorithm, joined the BDS system based on mature GPS RTK algorithm.In this paper, the space-time datum of BDS/GPS is unified, the use of dual band wide lane measurements as RTK observation is determined, the BDS/GPS RTK positioning mathematical model is derived, the whole week drop ambiguity is resolved by the Kalman filtering algorithm and least squares correlation method. In actual work, for the time synchronization problem due to the network delay, one synchronization method of time - pre review update method is put forward. This method can be used for real-time RTK to ensure the latest epoch results and improve the integrity of the calculation.2. The software on Windows system computer terminal and the Windows Mobile system terminal is established. and through the post RTK data processing and analysis, static real-time RTK data processing and analysis, the handset real-time RTK data processing verified and analyzed the correctness of the theory and method of programming in this paper, and verified the accuracy and reliability of the location of BDS/GPS dual frequency RTK.