基于动力学轨道拟合的LEO卫星轨道预报精度分析

Accuracy Analysis of LEO Satellite Orbit Prediction Based on Dynamic Fitting Method

轨道预报是地球探测卫星顺利执行科学任务的一个重要环节。为了实现对低轨卫星长弧段、高精度的轨道预报,文中运用动力学轨道拟合的方法进行轨道预报。选用GRACE-A卫星、HY-2A卫星和JASON-2卫星为例进行预报处理,分析了卫星的轨道高度和拟合弧长对轨道预报结果的影响。结果表明,GRACE-A卫星预报4h和8h轨道的3DRMS分别优于3m和10m,HY-2A卫星和JASON-2预报4h轨道的3DRMS分别优于2dm和1dm,24h轨道预报结果3DRMS分别优于2.5m和2m.

The orbit prediction plays a significant role in the scientific mission of remote sensing satellite.To obtain the long-period and high-precision orbit prediction,the orbit forecast is performed by a dynamic fitting method.To analyze the effect of orbital height and different fitting arc lengths on the accuracy of orbit forecast,the data of the GRACE-A satellite,HY-A satellite,Jason-2 satellite are used as examples.From the results,it is concluded that the prediction orbit of 3D RMS of 4 h and 8 h arc length of GRACE-A satellites,the results are better than 3 m and 10 m respectively;for HY-2A and Jason-2 the 4 h arc length prediction results are less than 2 dm and 1 dm separately,24 h arc length prediction results are better than 2.5 m and 2 m respectively.