利用里程仪可以抑制惯导的误差积累，但里程仪刻度系数误差对组合系统的定位精度影响很大，必须对其进行校正。

The error accumulation of inertial navigation system can be restrained via OD, however, OD scale factor error has remarkable effect on the positioning precision.

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用强化系数求出强化试验时间以及故障里程，根据故障里程可以对试验结果进行评价。

Failure's miles and the time of enhancement test can be got with enhancement coefficient.

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