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chill_notes/GNSS/基础知识/RMS.md
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RMS 即均方根误差Root Mean Square
![vTpv](Exported%20image%2020260407225345-0.png)
其中:
V为观测值的残差
P为观测值的权
n-f为观测值的总数减去未知数个数。
RMS表明了观测值的质量。RMS越小观测值质量越好
反之,表明观测值质量越差。它不受观测条件(如卫星分布好坏)的影响。
依照数理统计的理论观测值误差落在1.96 倍RMS 的范围内的概率
是95%。