摘要
本文研究地球惯性系中相对论效应对GPS单点定位精度的影响。首先从太阳的各向同性Schwarzschild度规出发,计入地球和月球的引力场的贡献,求得地球惯性系中的度规系数goo。然后估算广义和狭义相对论效应对GPS的原子钟频率、GPS卫星的运行轨道以及GPS导航信号传播的影响。在此基础上计算地球、月球和太阳引力场引起的单点定位误差,并分析误差各部分的来源和重要程度。
The relativistic effects on point-positioning precision in the GPS are studied with reference to an earth centered inertial coordinate system. First, the metric coefficient 900 in the earth centered inertial system is obtained from the sun's Schwarzschild isotropic metric, with the gravitation of the earth and the moon taken into account. Then the general and special relativistic effects on the GPS atomic frequency standards, the GPS satellites' orbits and the propagation of the GPS navigation signals are estimated, based on which the point-positioning errors caused by the gravitation of the earth, the moon and the sun are evaluated, and the sources and importance of each components of the errors are analysed.
基金
国家自然科学基金
关键词
GPS
地球惯性系
相对论效应
单点定位精度
GPS, Earth centered inertial system, Relativistic effects, Point-positioning precision
