在无扰动惯性运动中，角动量是恒定的。

In undisturbed inertial motion, the angular momentum is constant.

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该文的研究为无陀螺惯性测量组合的实际应用奠定了基础，并对加速度计的选用具有一定的指导意义。

This research establishes the bases for practice application of gyros free inertial measurement unit and has some guidance for selecting the accelerometers.

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提出了九加速度计无陀螺惯性测量组合(NGIMU)配置方案，并建立了其实验系统。

A new nine-accelerometer configuration of non-gyro inertial measurement unit (NGIMU) is presented, with its experiment system built.

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