Enhanced solar radiation pressure modeling for Galileo satellites
Enhanced solar radiation pressure modeling for Galileo satellites
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DOI：
10.1007/s00190-014-0774-0
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发表时间：
2015-03-01
影响因子：
4.4
通讯作者：
Hugentobler, U.
中科院分区：
文献类型：
--
作者：
Montenbruck, O.;Steigenberger, P.;Hugentobler, U.
本文介绍了一种新的方法来模拟太阳辐射压（SRP）对全球导航卫星系统（GNSS）的影响。它侧重于伽利略在轨验证（IOV）卫星，明显的SRP建模缺陷，可以确定在目前可用的精确轨道产品。为了克服这些问题，在太阳方向（D），太阳电池板轴（Y）和正交（B）轴的经验加速度的估计是由一个先验模型占矩形航天器的贡献补充。除了包括几乎立方体的GPS卫星之外，Galileo IOV卫星呈现出明显的矩形形状，其主体轴线的比率约为2：1。先验箱模型的使用允许正确地模拟偏航转向姿态模式期间暴露于太阳的变化横截面，并有助于消除迄今影响伽利略轨道确定的系统性每转一次的轨道误差。适用于IOV卫星的简单先验长方体模型的参数是通过对国际全球导航卫星系统服务组织多全球导航卫星系统实验全球网络收集的一组长期全球导航卫星系统观测数据进行分析而确定的。最后，该模型被证明，以减少径向轨道误差的峰值幅度从目前的20厘米下降到5厘米以外的日食阶段。
This paper introduces a new approach for modeling solar radiation pressure (SRP) effects on Global Navigation Satellite Systems (GNSSs). It focuses on the Galileo In-Orbit Validation (IOV) satellites, for which obvious SRP modeling deficits can be identified in presently available precise orbit products. To overcome these problems, the estimation of empirical accelerations in the Sun direction (D), solar panel axis (Y) and the orthogonal (B) axis is complemented by an a priori model accounting for the contribution of the rectangular spacecraft body. Other than the GPS satellites, which comprise an almost cubic body, the Galileo IOV satellites exhibit a notably rectangular shape with a ratio of about 2:1 for the main body axes. Use of the a priori box model allows to properly model the varying cross section exposed to the Sun during yaw-steering attitude mode and helps to remove systematic once-per-revolution orbit errors that have so far affected the Galileo orbit determination. Parameters of a simple a priori cuboid model suitable for the IOV satellites are established from the analysis of a long-term set of GNSS observations collected with the global network of the Multi-GNSS Experiment of the International GNSS Service. The model is finally demonstrated to reduce the peak magnitude of radial orbit errors from presently 20 cm down to 5 cm outside eclipse phases.