区域卫星导航系统的卫星星座

首先介绍了北斗系统的区域星座特点，然后从相对定位几何精度因子（relative dilution of precision，RDOP）和定位误差两方面进行精度分析，初步得出了北斗相对定位精度与区域星座的关系。
理论分析和实验结果都表明，在我国范围内采用北斗卫星导航系统进行短基线相对定位时，其东西方向定位精度优于南北、高程方向；南北方向与高程方向的定位误差呈负相关；北斗相对定位精度随纬度增加而降低；与GPS相比，北斗相对定位在南北方向精度略差；载波相位相对定位精度受北斗区域星座的影响略大于单频伪距差分。

Satellite Constellation of Local Navigation System

The current constellation of BeiDou Navigation Satellite System (BDS) is described and the relationship between the accuracy of BDS relative positioning and its regional constellation characteristic is discussed in relation to the RDOP (Relative Dilution of Precision) and positioning errors.
Experiments were conducted, the results obtained when using BDS relative positioning on short baseline in our country show that: (1) the accuracy of BDS relative positioning is better in the east-west direction than in the south-north direction and the elevation direction; (2) positioning errors in the south-north direction and elevation direction are negatively correlated; (3)the improvement of positioning accuracy reduces as the latitude increases; (4)BDS positioning accuracy is slightly less than GPS in the south-north direction; (5)the impact of BeiDou regional constellation on carrier phase relative positioning accuracy is slightly larger than the single-frequency pseudo-range differential.