This paper reviewed the position estimation methods of various motors and analyzed their advantages and disadvantages. By using these methods, position sensors can be eliminated to a great extent.
文章综述了各种电机的一些位置估计方法，分析了其优缺点，这些方法在很大程度上可取代位置传感器。
This paper has summarized the basic theory for GIS spatial position data uncertainty estimation and the error propagation, and practical estimation methods.
本论文归纳总结了GIS空间位置数据不确定度估计和误差传播的基础理论和实用的估计方法。
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