The bias of MEMS gyro is instable , if it can not be compensated on line, the accuracy of INS will be low.
由于微机械陀螺零偏重复性和稳定性差，若不能实时跟踪零偏变化，则由此产生的导航误差较大。
But voice signal is an instable process, so standard FT that fit to the period signal and stable signal can not be express the voice signal directly.
然而，语音信号是一个非平稳过程，因此适用于周期信号、瞬变信号或平稳随机信号的标准傅立叶变换不能用来直接表示语音信号。
Frequent calculations not only cost much valuable system resources, but also make the calculated routing table instable.
频繁的计算消耗大量宝贵的系统资源，还使计算得出的路由表稳定性较差。
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