... · 绝对式传感器 absolute transducer · 阶比（阶次） order ratio · 角传感器 angular transducer ...
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给出了二阶比估计量的偏差、估计量的均方误差以及均方误差的估计。
For the ratio estimate in two-stage sampling, the bias and mean square errors(MES) of the estimater value have been obtained, and the estimater value of the MSE has been given.
状态方程表示了阶比幅值的平滑变化，观测方程表示了测量误差和噪声。
Smooth order amplitude variance was expressed by using state equation, and measurement error and noise were expressed by adopting observed equation.
本文主要论述阶比谱分析方法及其在汽车起动电机故障实时诊断中的应用。
This paper mainly treats the order ratio spectrum analysis (ORSA) and its application to the realtime fault diagnosis of the car-starters.
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