摘要
列出了轨道拟合和轨道外推所用的摄动力模型,讨论了轨道拟合和轨道积分的过程。利用轨道拟合的方法拟合出高精度的初始轨道参数,在此基础上外推7天的轨道,将结果与IGS提供的最终星历比较,得出GPS轨道的外推精度:每颗卫星都是切向误差最显著,径向和法向的误差不明显;星蚀卫星的轨道外推精度明显低于一般卫星;问题卫星的轨道外推误差特别大。
It gives perturbative force model which is adopted by orbit fitting and orbit prediction at length and dicusses the process of orbit fitting and orbit prediction. First, high precise osculating orbit parameters is attained by fitting orbit; then, it extrapolates the 7-days orbit; at last compares the 7-days orbit with the IGS final orbit in order to get the precision of orbit prediction of GPS satellites. For every satellite, the error of along track direction is distinct, but the error of radial and out of plane direction are not distinct; the precision of orbit prediction of eclipsing satellites is much lower than the common satellites; the error of orbit prediction of eclipsing satellites is especially large.
出处
《测绘工程》
CSCD
2006年第2期27-29,39,共4页
Engineering of Surveying and Mapping
