The Application of Bernese ECOM Slar Rdiation Pessure Model in BDS Pecise Orbit Dtermination

The Bernese ECOM solar radiation pressure model is widely used in precise orbit determination (POD) for GNSS navigation satellites¹. But when used for BeiDou POD, the accuracy may not be the best when all the nine parameters are solved. The MGEX precise ephemerides of one year were collected. A one-year time series of the nine parameters were analyzed by orbit fitting. The results show that there are strong correlations between Bc/Bs parameters and Yc/Ys parameters. At the same time, the Bc/Bs parameters have a one year cycle and are an order of magnitude larger than Yc/Ys parameters. Sgnificance testing of the ECOM regression model results show that the significance level of Bc/Bs parameters is higher than Yc/Ys parameters. Experinments on orbit determination using different schemes with data from MGEX monitoring stations were carried out. The results show that only the five parameters that D0/Y0/B0/Bc/Bs yielded the highest precision of orbit determination, thus the five parameter EOCM model is better for BeiDou POD.