Performance Analysis Of BDS/GPS Network RTK

In recent years, satellite positioning technology has been developed rapidly in the global,especially with computer technology, wireless communication technology and other cross-integration, Real-time dynamic positioning also gets rapid development. Multi - system Fusion Network RTK Technology, Because of its high precision, high efficiency and high reliability,it has been widely used in all walks of life. With the development of Beidou system, BDS network RTK technology continues to mature, multi-constellation network RTK technology will be more widely used. Therefore, BDS and GPS constellation network RTK system performance research, the construction of China's Beidou satellite navigation system And development is of great significance.In this thesis, the content is based on the ground CORS enhanced network RTK technology performance analysis, and the evaluation of the role of Beidou system in network RTK system is given. First of all, combined with China's independent research and development as well as the construction of Beidou satellite navigation system, the basic principle, composition and key technology of network RTK system are introduced in detail.At the same time, the error sources that affect the accuracy of network RTK are expounded,and the corresponding methods to mitigate or eliminate the errors are summarized. According to the spatial correlation error estimation, the difference correction number generation and the release of different processing methods, several major network RTK technologies that applied widely in current are analyzed and compared..This thesis focuses on the performance test of network RTK system. And based on the VENUS system software developed by the Satellite Navigation Research Center of Southwest Jiaotong University, the design and development of performance comparison test implementation and test content of the BDS / GPS network RTK is designed and developed for Chengdu city domain continuous operation reference network coverage area. This thesis analyzes and compares the performance of GPS and BDS / GPS network RTK system in detail,and gives an objective evaluation of the performance of the two systems. On this basis, the role of Beidou in multi - constellation network RTK system is summarized.The test data is collected in the range of CORS network composed of MZHU, DUJY,CHDU, QLAI, XINJ, DANL, RENS7 base stations, and the accuracy inside or outside the system, time availability, net uniformity, differential accuracy, distance correlation, dynamic performance and positioning service effectiveness are analyzed in detail. Based on the analysis,the system performance of GPS / BDS network RTK system and GPS network RTK are objectively evaluated, and the function of Beidou system in the multi-constellation network RTK system is summarized.