中国卫星导航系统管理办公室测试评估研究中心

Test and Assessment Research Center of China Satellite Navigation Office

中文 English

北斗服务性能

空间信号测距误差（SISRE）是UERE主要构成部分，定位精度可以近似用公式: 表达，SISRE反映卫星播发的导航电文偏差对用户测距的影响。

图1. 北斗空间信号精度

SISRE为卫星地球表面覆盖范围内所有点瞬时SISRE的RMS统计值，可以利用卫星的径向、切向、法向轨道误差和钟差偏差按照下面的公式进行计算：

式中：c为光速，T为钟差偏差，R为径向轨道偏差，A为切向轨道偏差，C为法向轨道偏差。α和β的取值如下表所示。

表各卫星导航系统α和β的取值

	BDS(GEO/IGSO)	BDS(MEO)	GPS	GLONASS	GALILEO
α	0.99	0.98	0.98	0.98	0.98
β	127	54	49	45	61

图2. 沿径向、切向和法向轨道误差及空间信号测距误差公式推导图

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