Determination of BDS Monitoring Stations Coordinates and Its Influence on Orbit Determination Accuracy

This paper discusses the calculaion approach of the coordinates of the BeiDou monitoring stations by proposing two schemes, one is precise point positioning (PPP) and the other is net-solution with MGEX. Only BDS observation data is used to verify two schemes. Especially, the improvement for the BeiDou satellites orbit determination accuracy with regional tracking network after coordinates refinement is analyzed. Initial results indicate that the PPP repeatability of station coordinates bias for days is better than 2.3 cm in the horizontal component and 3.4 cm in the vertical component, the net-solution repeatability for days is better than 0.8 cm in the horizontal component and 2.2 cm in the vertical component. BDS orbit determination accuracy with regional tracking network has a great enhancement after coordinates update using net-solution. The accuracy of IGSOs 3D overlap improves by 15.4%, while MEOs improves by 25.8%. The SLR validation reveals that laser residuals of BD-2 satellites reduce from 0.39 m to 0.24 m, the accuracy improves by 38%, the residuals of BD-3 satellites reduce from 0.25 m to 0.18 m, the accuracy improves by 28%.