低轨卫星星载GPS天线相位中心模型估计对卫星定轨的影响

The Estimation of On-borne GPS receiver of LEO and the Effect on Precise Orbit Determination

天线相位中心变化(PCV)作为低轨卫星精密定轨的重要误差之一,必须提前进行标定和建模。本文以低轨卫星SWARM卫星为例,基于消电离层组合简化动力学定轨的残差建立了低轨卫星星载GPS的PCV模型,并分析了PCV对卫星定轨的影响。结果表明SWARM三颗卫星的PCV模型非常相似,与高度角、方位角存在强相关性,部分区最大值可达2.0 cm,而且PCV对SWARM卫星的简化动力学和几何轨道的影响较大,尤其是法向,最大可到2.0 cm。

The antenna phase center variation(PCV)is one of the important errors in the precise orbit determination(POD)of low-orbit satellite.It must be calibrated and modeled in advance.In this paper,a PCV model is established based on the residuals of POD with ionosphere-free combination observation and reduced-dynamic solution.The result shows that the PCV model of the three satellites is very similar and has a high dependence on the elevation-azimuth angle and the maximum value in some regions is up to 2.0 cm.