Abstract:In this paper, we check the quality of the HY-2B onboard GPS data, and analyze the influence of the pseudo-random pulse prior value on the reduced-dynamic precision orbit determination. At all time interval, when the prior standard deviation is 1×10-8 m/s2, the orbit determination accuracy is the highest, and the optimal pseudo-random pulse interval is 6 minutes. This study estimates the antenna phase center variations(PCV) and analyzes the influence of different resolution PCV(10°×10°, 5°×5°) models on the orbit determination results through phase residual, overlapping orbit comparison and SLR. The experimental results show that more than 4 GPS satellites can be observed in over 99% of the epochs, data integrity rate reaches 99.65%, and average RMS of multipath errors of the L1 and L2 bands are 15.7 cm and 9.5 cm respectively, proving the good performance of the domestic HY2 receiver. The orbit accuracy of internal validation reaches the centimeter level. The SLR verification RMS value is 27.8 mm without PCV model. After adding the 10°×10°, 5°×5° PCV models, the SLR verification RMS values improve 0.9 mm and 1.2 mm, respectively. The orbit accuracy of external validation also reaches the centimeter level.
WANG Guangzhe,GUO Jinyun,GUO Hengyang et al. Analysis of HY-2B Onboard GPS Data Quality and Reduced-Dynamic Precise Orbit Determination[J]. jgg, 2022, 42(5): 472-476.