原子钟性能对卫星导航系统定位精度的影响分析

星载原子钟是卫星导航系统的关键设备,原子钟主要通过影响卫星钟差对定位精度产生影响,分析了GNSS星载原子钟性能对定位精度的影响.通过原理分析,建立了原子钟稳定度与卫星导航系统定位精度的关系.在不考虑控制段对星钟校准误差的前提下,将原子钟噪声与星上工作环境因素作为主要因素,分析了GPS-IIF铷钟和铯钟对钟差/定位误差的影响,并给出了分析结果.最后,利用iGMAS提供的钟差产品数据,对比了北斗和GPS部分原子钟的稳定度及其对定位精度的影响,为后续星载原子钟的发展与选择提供了一定参考.

Analysis of the Influence of Atomic Clock Performance on Positioning Accuracy of Satellite Navigation Systems

Space-borne atomic clocks are the key components of Global Navigation Satellite Systems (GNSS). Atomic clocks affect positioning accuracy mainly by affecting satellite clock error. This paper analyzes the influence of atomic clocks on positioning accuracy in GNSS. The relationship between atomic clock stability and positioning accuracy has been established by principle analysis. Without considering the calibration error of satellite clock in the control section, the influences of GPS-IIF rubidium atomic clock and cesium atomic clock on satellite clock error/positioning error are analyzed. Finally, by using the clock data products provided by iGMAS, the stability of atomic clocks used in BDS and GPS and their influences on positioning accuracy are analyzed, providing some reference for the development of future on-board atomic clocks.