卫星星座整网轨道确定分析与仿真

编队飞行的卫星或卫星星座对轨道确定自主性和精度提出了较高要求。针对这个问题，通过建立星座的轨道动力学模型和星间观测的测量模型，将星座中的星间观测数据和地面观测数据融合起来，将待估的卫星轨道参数和部分动力学参数进行适当的分类，研究卫星星座整网轨道确定的新方法，并在理论上分析了整网定轨方法能提高定轨精度的原因；最后采用自主开发的卫星星座整网轨道确定软件进行了仿真计算。计算表明，该方法能有效地减少对地面站的依赖，并较大幅度提高定轨时卫星绝对位置和相对位置精度。

Simulation and Analysis of Integrated Orbit Determination of Satellites Constellation

For format flying satellites or satellites constellation, the autonomous orbit determination and the high orbital accuracy is required. To meet this require, a new method of the integrated orbit determination of satellites constellation(IODSC) or format flying sat-ellites was proposed, based on development of the satellite-to-satellite tracking (SST) measurement models and orbital dynamical model, the fusion of SST observation data and ground-based tracking(GBT) data, and proper categorization of the orbital parameters, dynamic parameters and kinematical parameters. The improvement of the orbital accuracy was analyzed theoretically. Finally some simulation was made and its results were evaluated. It verified that the new method could decrease dependence on ground tracking, and could improve the orbit determination accuracy obviously, especially the relative orbit accuracy among satellites.