摘要
讨论星载GPS接收机为单频情形的低轨卫星几何法定轨 ,包括绝对定轨法 ,相对定轨法和动态网定轨法 ,并利用TOPEX/POSEIDON卫星星载GPS实现L1观测值进行验证 .结果表明 ,绝对定轨法三维轨道位置精度可达 2 0m左右 ,适用于低轨卫星实时导航 ;相对定轨和动态网定轨精度均比绝对定轨精度高 ,伪距相对定轨三维轨道位置精度可达米级 ,载波相位相对定轨精度可达分米级 ;动态网定轨相当于在各基准站相对定轨之间加权均衡 ,并且提高了定轨的可靠性 .相对定轨和动态网定轨适用于低轨卫星后处理定轨 .
The methods of geometric orbit determination (OD) for GPS based single frequency receivers aboard low earth satellites are studied. They include absolute OD, relative OD and kinematic network OD. From the results calculated with the L1 data collected by GPS/DR aboard TOPEX/POSEIDON, the following conclusions are drawn: (a) The accuracy of absolute OD may be in the order of 20 meters, and it can be used in navigation for low earth satellites. (b) The accuracy of pseudorange based relative OD may be in the order of a few meters. (c) The accuracy of carrier based relative OD may be in the order of a few decimeters. (d) The accuracy of kinematic network OD is equal to the weighted mean of relative OD's of ground tracking stations, and this improves the reliability of OD. (e) The accuracy of relative OD and kinematic network OD is higher than that of absolute OD, so they can be used in post processing OD for low earth satellites.
出处
《天文学报》
CSCD
北大核心
2000年第3期278-288,共11页
Acta Astronomica Sinica
基金
国防科工委重大项目子课题以
中国科学院动力大地测量学开放研究实验室资助
关键词
GPS
几何法定轨
低轨卫星
GPS, geometric orbit determination, low earth satellite
