提出了一种民用飞机组合导航实际导航性能计算方法，通过提取组合导航卡尔曼滤波器的误差协方差 矩阵，并对水平位置误差进行近似拟合，获得95% 的概率误差圆半径，即为组合导航实际导航性能。该方法 计算过程简单，易于实现，具有较强实用价值。

An ANP calculation algorithm is introduced for integrated navigation of civil aircrafts. Through extracting the error covariance matrix of the integrated navigation kalman filter and approximately fitting the lateral position error, a circle radius can be achieved with a 95% probability error. This is the introduced ANP of the integrated navigation. Such an algorithm is simple, easy to implement and thus has a good practical value.

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