GPS定位中卫星坐标计算的曲线拟合法  

The Curve-Fitting Model for GPS Orbit Calculation

作　　者：陈逸群[1] 胡丛玮[1] 杨欢庆 

机构地区：[1]同济大学 [2]上海市城建设计研究院

出　　处：《测绘工程》2000年第2期40-44,78,共6页Engineering of Surveying and Mapping

摘　　要：在 GPS单点定位和相对定位中都需要不断计算卫星的坐标。卫星的坐标是根据接收到的广播星历来计算的。在后处理中也可以用精密星历来计算卫星坐标。而每次计算卫星坐标都需要占用大量内存和时间 ,影响计算速度。本文介绍了曲线拟合法的基本模型 ,讨论了适合计算卫星坐标的多项式算法 ,通过对实际观测数据的处理表明采用正交多项式拟合效果最好。另外还就曲线拟合的取样点和多项式的阶数等问题进行了讨论。It is important to get the coordinates of the satellites continually in the GPS single point and relative positioning. The coordinates of the satellites are got according to the boradcast ephemeris received. It can also be got in th post processing according to the precise ephemeris. But a lot of memory and time is engrossed in order to get the coordinates of the satellites. This paper introduces the basic model of the curve fitting, discusses the polynomial arithmetic adapting to the computation of the coordinates. By processing of the observation data the precision of millimeter is achieved. In addition this paper discusses the problem of the sample point and the rank of polynomial of Curve fittng model.

关 键 词：曲线拟合 广播星厍 卫星坐标 曲线拟合法 

分 类 号：P228[天文地球—大地测量学与测量工程] P207[天文地球—测绘科学与技术]