星历计算

利用广播星历计算GPS卫星位置及误差分析

Calculation and error analysis of GPS satellite position by making use of broadcast ephemeris

结果表明，该方法确实提高了GPS卫星轨道位置坐标计算的精度。利用广播星历计算GPS卫星位置的误差主要是由于时间外推方法造成的。

The results show that this method improvs the GPS satellite orbital positions coordinate calculation accuracy , and the errors calculated by making use of the broadcast ephemeris are caused by the method of extrapolation of time .

本文研究的结果提供了一套由精密星历计算轨道参数的方法及一套各个GPS卫星在一个较长时间段内各历元时刻的轨道参数，为进一步的研究提供数据。

The result of this study provides a method calculating GPS satellite orbit parameters through IGS precise ephemerides . Orbit parameters of each GPS satellite at each epoch over a long period are calculated , which can be used for further research .

结果表明，对800～3000km的GPS基线，利用精密星历计算，边长及其经纬度分量重复测量精度可达10－8～10－9；

The results show that for baselines of 800 ~ 3000 km the repeatability of baseline lengths and their latitude and longitude components is 10 - 8 ~ 10 - 9 as calculated with precise ephemerides ;

考虑后牛顿效应的二体问题的解和星历计算

Solution and position computation of the two-body problem considering PN effect

GPS/GLONASS组合导航中的星历计算与数据融合

Orbit Computation and Data Fusion of GPS / GLONASS Integrated Navigation System

第二部分是对精密定轨中星历计算方法的描述，包括数值法和分析法两种方法。

In the second part , two methods of ephemeris computation are introduced , including the numerical integration and analytical method .

随着星载计算机系统结构和性能的改善，利用星载计算机实现高精度的星历计算成为可能。

With the great improvement of system structure and performance for onboard computers , it is feasible to predict precise orbits onboard .

地面软件包括数据采集模块、星历计算模块、差分处理模块、飞行轨迹回放模块等。

The software for ground workstation make up of data acquisition module , computing time module , difference computing module and module for flight track .

星历表计算同步卫星

Ephemeris table computation synchronous satellite

对只接收到一组GPS卫星广播星历的情况下应用广播星历拟合计算卫星在轨位置的方法进行了研究，通过与精密星历进行比较，对拟合计算的精度进行了说明。

A method of GPS satellite orbital coordinates calculating with Chebyshev Polynomial Simulation was devised in this paper based only on receiving a group of GPS broadcast ephemeris . By comparing with GPS precise ephemeris , the accuracy of calculation was analyzed .

结果表明GPS广播星历参数模型具有更高的精度，但GLONASS广播星历参数模型具有计算速度快，适合轨道变化快的卫星定轨。

The result indicates that GPS broadcast ephemeris parameter model has a higher accuracy , but GLONASS broadcast ephemeris parameters model has a quicker computation speed , which is suitable for determinating orbit which changes fast .