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本文针对地面用户与空间用户在测量环境与观测几何动态性等方面的不同,基于导航卫星可见性与加权精度因子(WDOP)对混合星座导航系统的定位性能进行了分析。给出了不同用户的星座天空视图与可视时长;从理论上讨论了权值选取对WDOP的影响。仿真表明,地面静态用户对不同类型导航卫星的可见性差异很大;而低轨卫星用户的可视时长更短,观测几何快速变化,WDOP数值较大且呈现周期性变化。
In this paper, based on the difference of the measurement environment and the geometry of observation geometry between the terrestrial user and the space user, the positioning performance of the hybrid constellation navigation system is analyzed based on the navigation satellite visibility and weighted precision factor (WDOP). The constellation sky view and visual duration of different users are given. The influence of weight selection on WDOP is discussed theoretically. The simulations show that the visibility of ground-based static users is very different for different types of navigation satellites. However, for low-orbit satellite users, the visual duration is shorter and the observation geometry changes rapidly. The WDOP value is larger and shows periodic changes.