导航星座自主时间基准的相对论效应

发布时间：2018-10-21 12:22

【摘要】：从相对论框架下导航星座自主时间基准定义及其生成原理出发,对其实现要素进行了相对论分析及改正,包括卫星原子钟和星间链路测量量相对论效应,并以GPS、BDS为例计算说明。得出以下结论:1)卫星钟相对论常值由地面频率调整实现预修正,周期累积钟差则根据卫星星历实现实时计算和改正;在此基础上,2)星间链路伪距测量相对论效应主要是星间信号传播相对论效应,对中高轨卫星其最大影响为cm量级;3)星间链路多普勒测量相对论效应则是由卫星钟周期项频率变化引起,对小偏心率中高轨卫星而言,其对星间径向相对速度最大影响量在1 cm/s左右。分析结果有助于提高导航星座自主时间基准的准确度,并对深空测量和天基时间基准研究具有一定参考意义。
[Abstract]:Based on the definition and generation principle of autonomous time reference for navigation constellation under relativistic framework, the realization elements are analyzed and corrected relativistically, including relativistic effects of satellite atomic clock and intersatellite link measurements, and GPS,BDS is taken as an example. The conclusions are as follows: 1) the relativistic constant of satellite clock is pre-corrected by ground frequency adjustment, and the periodic cumulative clock difference is calculated and corrected in real time according to satellite ephemeris; On this basis, 2) relativistic effect of inter-satellite link pseudo-range measurement is mainly relativistic effect of inter-satellite signal propagation. The maximum influence on the medium-high orbit satellite is cm order of magnitude, 3) the relativistic effect of intersatellite link Doppler measurement is caused by the frequency change of satellite clock period term, for the small eccentricity medium-high orbit satellite, the relativistic effect is caused by the variation of the frequency of satellite clock period. The maximum influence on intersatellite radial relative velocity is about 1 cm/s. The analysis results are helpful to improve the accuracy of autonomous time reference of navigation constellation, and have certain reference significance for the deep space measurement and the research of space-based time reference.
【作者单位】：国防科技大学机电工程与自动化学院;
【分类号】：TN96.1

【参考文献】