基于GPS的地球资源卫星精密星历外推新方法

随着技术的发展,通过星载GPS接收机直接确定卫星星历成为卫星定位的一个重要手段．GPS接收机获取的卫星星历数据是某一时刻的瞬时状态,要获取连续的卫星星历数据还需要进一步处理．常用的处理方法有几何法与动力学法．在GPS接收机给定瞬时星历频率较低的情况下,几何法的计算误差比较大,特别是只有一组瞬时星历时,无法用几何法进行轨道的外推．在分析地球资源卫星轨道特点的基础上,提出一种新的轨道缩减动力模型,该模型将卫星运动在直角坐标系中分解为简谐运动,利用模型实现了轨道外推的算法．通过试验验证,该算法可以达到较高的精度．

A New Orbit Forecast Method Based GPS for High Precision Ephemeris of Earth Resource Satellite

With the development of technology,the method that acquires satellite ephemeris data from onboard GPS data directly becomes an important means of satellite orbit determination and an important;research task.The satellite ephemeris obtained by GPS receiver is in an instantaneous state at a certain moment.The acquisition for continuous satellite ephemeris data needs further processing. The commonly used processing methods are based on geometry and dynamics.The calculation error of geometry would be great when the frequency of the instantaneous satellite ephemeris is low. Further more it is unable to conduct the extrapolating of the satellite orbit when only one group satellite ephemeris exists.Based on the analysis of Earth Resources Satellite orbit character,this paper proposed a novel reduced dynamic orbit determination which can reduce the calculation error of satellite ephemeris.The model breaks up satellite motion into simple harmonic motion in rectangular coordinate.The Paper make use of this determination to realize the orbit extrapolate algorithm. Finally,the result of our experiment indicates that the algorithm can reach high precision and reduce the complexity of calculation process at the same time.