北斗卫星定轨中的常用光压模型比较

Comparison of the Common Radiation Models Used in Beidou Satellites Orbit Determination

利用北斗精密星历作为伪观测值拟合了伯尔尼(BERN)光压模型和球光压模型的光压参数,并利用所求参数分别进行了轨道外推。通过分析轨道拟合和外推精度得到如下结论:在1 d的弧段上,BERN模型对于3类卫星GEO,IGSO和MEO的拟合精度相当且精度优于10 cm;球模型对于GEO和IGSO的轨道拟合精度相当且精度优于50 cm,明显低于其对MEO的拟合精度;对于GEO和MEO以及IGSO卫星6号星,利用BERN模型得到的外推轨道比利用球模型得到的外推轨道精度高;但对于8号,9号及10号IGSO卫星而言,利用球模型得到的外推轨道比利用BERN模型得到的外推轨道精度高。

The precise ephemeris of Beidou are used as pseudo-observations to fit the radiation parameters of the BERN model and the Sphere model, and the parameters are used to extrapolate the orbit. By comparing the fitting accuracy and the prediction accuracy, some results can be following： the fitting accuracy of BERN model for GEO, IGSO and MEO is same, and is better than 10 cm. The fitting accuracy of Sphere model for GEO and IGSO is bet-ter than 50 cm which is significantly lower than that for MEO. The prediction orbits of GEO, MEO and PRN 6 which are got by using the BERN model have a better accuracy than that are got by using the Sphere model; but the prediction orbits of PRN8, PRN9 and PRN10 which are got by using the BERN model have a lower accuracy than that are got by using the Sphere model.