Design and Verification of GPS/BDS Dual-Mode Navigation System for Low Orbit Remote Sensing Satellite

According to the application requirements of GPS/BDS dual-mode navigation terminals and the improvement requirements of orbit determination accuracy index for low-earth-orbit remote sensing satellite, the on-board factors affecting the real-time and the post orbit determination accuracy of navigation terminals for LEO remote sensing satellite are systematically analyzed and described. A method to improve the stability of antenna phase center and the quality of received signal by optimizing the layout of navigation receiving antenna is proposed. The verification of ground and in orbit test data shows that the real-time orbit determination accuracy of the improved system in GPS and BDS mode meets the requirements of 3~5 m index, and the post precise orbit determination accuracy meets the requirements of 10 cm index, which indicates that the design of the GPS/BDS dual-mode navigation can meet the requirements of satellite mission and can provide reference for the design of subsequent remote sensing satellites.