北斗地基导航增强系统布站设计

Monitoring Station Layout Design of BeiDou Ground-based Augmentation System

地基导航系统在复杂的地形地貌环境中有较强的区域覆盖能力，其在一定程度上解决了北斗卫星导航系统在特定使用场景下存在的卫星遮挡严重、定位精度不佳、抗干扰能力不足等问题。本文重点针对北斗地基导航增强系统基站布设问题进行研究，指出北斗系统不同点位用户可见卫星具有空间位置上偏向一侧的特点。分析结果表明，北斗地基导航基站布设，应以可见GEO卫星平均方位角为中心，布设在其对称位置的服务区边界附近，并通过小范围内的遍历搜索优化布站方案，达到减少搜索范围，提高计算效率的目的。

Since the ground-based navigation system can provide better regional coverage in complicated terrain and land- form, it has the ability to overcome some defieiencis of BDS in specific conditions to some extent, such as satellites being serious- ly shaded, poor positioning accuracy, insufficient anti-interference ability, etc. In this paper, the monitoring station layout design of BeiDou ground-based augmentation system is studied, and it is found that the visible satellites of BDS for users at different sta- tions have an imbalance location distribution. The analysis results show that the the monitoring station layout design of BeiDou ground-based augmentation system should be centered on the average azimuth of visible GEO satellites and located on the symmet- ileal point of the service area＇s boundary. The layout design is optimized by traversal searches in small areas to reduce the search- ing range and improve the calculation efficiency.