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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．
With the development of technology, it is an important method to determine the satellite ephemeris directly by satellite onboard GPS receiver. GPS satellite ephemeris data obtained by the receiver is a moment of the instant state, to obtain continuous satellite ephemeris data still need further processing. Commonly used methods of geometry and kinetic method. In the case of low GPS receiver instantaneous ephemeris frequency, the geometrical error is relatively large, especially when there is only one set of instant ephemeris, it can not be extrapolated by geometry. Based on the analysis of the orbit characteristics of earth resources, a new orbit reduction dynamic model is proposed, which decomposes the satellite motion into simple harmonic motion in Cartesian coordinate system and uses the model to realize the orbit extrapolation algorithm. Through experimental verification, the algorithm can achieve higher accuracy.