Bernese ECOM光压模型在BDS卫星精密定轨中的应用

Bernese ECOM光压模型是目前GNSS导航卫星精密定轨中应用最多的经验型光压模型1]，但是其应用到北斗导航卫星（BeiDou Navigation Satellite System，BDS）精密定轨中，不一定9个参数全部解算定轨效果最佳。收集了MGEX一年的BDS精密星历，采用几何轨道平滑的方式反演出ECOM模型的9个光压参数，研究参数周年变化规律发现Bc、Bs参数与Yc、Ys相关性较强，Bc、Bs存在明显的周年特性而且量级较Yc、Ys大。通过ECOM回归模型整体显著性检验，确定出Bc、Bs的显著性水平明显高于Yc、Ys。最后通过MGEX监测站的实测数据定轨，轨道和钟差精度评估结果表明，只解算D0、Y0、B0、Bc、Bs 5个参数BDS定轨精度最高，建议BDS定轨中使用5参数ECOM光压模型。

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.