测控站布局对区域卫星导航系统的影响

建立区域卫星导航系统的测控网是卫星导航系统要解决的关键问题之一。讨论国内测控站的布设问题,采用网格计算方法分析国内测控站对导航星座的可观测性。引入位置精度衰减因子PDOP和定轨中的法矩阵条件数,分析测控网对导航星座的观测几何结构强度以及测站位置分布对轨道确定精度的影响,仿真结果表明,利用我国有限的国土跨度和航天测控资源可以确保对导航卫星的测控任务的完成。对在国外布设测控站进行讨论和仿真,结果说明位于国外的测控站(如可在澳大利亚的珀斯设站)的加入能明显改善观测的几何结构强度、提高导航卫星的轨道精度。

The Effect of TT&C Deployment on the Regional Satellite Navigation System

The telemetry,tracking,and command(TT&C) network is one of the key issues for regional navigation satellite system.Firstly,the domestic deployment of TT&C stations was discussed.The observability on navigation satellite constellation based on domestic stations was analyzed by means of grid computation.Then,the observing geometric structure intension on satellites was synthesized by the position dilution of precision(PDOP),and the influence of the station's location on satellite orbit determination precision was valuated by the condition number of normal matrix.The simulation shows that the TT&C stations located in the limited span of Chinese territory and the existing TT&C resources can accomplish the TT&C task.Finally,the setting of stations abroad was considered and simulated,and it verified that the joining of the stations abroad,such as the station in Perth in Australia,can improve the observing geometric structure intension and satellite orbit determination precision.