星地跟踪网的导航卫星精密轨道确定及预报

针对区域跟踪网不能覆盖导航卫星全弧段从而导致卫星定轨精度低的问题,简述了导航卫星和低轨卫星联合定轨模型,然后利用星地跟踪网观测数据同时确定了低轨卫星和导航卫星精密轨道,并根据实验结果详细分析了低轨卫星在联合定轨中所起到的作用。计算结果表明,引入低轨卫星之后,全球网和区域网定轨精度分别平均提高了20.0%和44.3%,区域网6h和24h的轨道预报精度分别优于10cm、13cm,利用星地跟踪网观测数据联合定轨方案是一种提高定轨精度并削弱对地面站依赖性的有效方法。

Precise orbit determination and prediction of navigation satellites based on space-ground tracking network

Aiming at the problem that regional tracking network can not cover the whole arc of navigation satellite,which reduced the precision of orbit determination,this paper briefly described the model of combined orbit determination,used the combined orbit determination approach to establish precise orbits of low earth orbit satellites(LEOs)and navigation satellites by the data of satellite-ground tracking network.Based on the results,the role of LEOs in the combined orbit determination was analyzed in detail.The results indicate that the precision of orbit determination of global network and regional network has increased by 20.0％ and 44.3％,respectively.The orbit prediction precision of regional network is better than 10 cm for 6 h and 13 cm for 24 h.Combined orbit determination approach is an effective method to improve the precision of orbit determination and weaken the dependence to ground stations by using the data of satellite-ground tracking network.