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arXiv 1003.5836gr-qc
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广义相对论框架下全球导航卫星系统的数值建模

Numerical modeling of a Global Navigation Satellite System in a general relativistic framework

P. Delva, U. Kostic, A. Cadez

摘要:

在这篇文章中,我们在史瓦西时空中建立了一个全球导航卫星系统(GNSS)模型,作为围绕地球的相对论几何的第一近似。解析地得到了分别描述卫星轨道和电磁信号轨道的闭合类时测地线和散射类光测地线。我们实现了一个算法来计算史瓦西坐标的GNSS用户谁收到适当的时间发送的四颗卫星,知道他们的轨道参数;逆过程来检查一致性。因此,卫星星座实现了地心惯性参考系统,而没有地面参考系的\emph{a priori}实现。我们表明,计算是非常快的,可以实现在一个真正的GNSS,作为一种替代通常的后牛顿校正。非重力扰动对定位误差的影响进行了评估,并概述了减少这些影响的方法。特别是,卫星之间的互连可大大提高定位系统的稳定性和准确性。

英文摘要:

In this article we model a Global Navigation Satellite System (GNSS) in a Schwarzschild space-time, as a first approximation of the relativistic geometry around the Earth. The closed time-like and scattering light-like geodesics are obtained analytically, describing respectively trajectories of satellites and electromagnetic signals. We implement an algorithm to calculate Schwarzschild coordinates of a GNSS user who receives proper times sent by four satellites, knowing their orbital parameters; the inverse procedure is implemented to check for consistency. The constellation of satellites therefore realizes a geocentric inertial reference system with no \emph{a priori} realization of a terrestrial reference frame. We show that the calculation is very fast and could be implemented in a real GNSS, as an alternative to usual post-Newtonian corrections. Effects of non-gravitational perturbations on positioning errors are assessed, and methods to reduce them are sketched. In particular, inter-links between satellites could greatly enhance stability and accuracy of the positioning system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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