Dead reckoning (DR) plotting can be done directly on a pilot chart or on a plotting sheet. Of the various types of navigation, dead reckoning alone is always available in some form.

推算(DR)策划可以做一名飞行员图表上直接单的时候，或者在一个策划各种类型的导航、推算独自总是可用的某种形式。

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The model of vehicular autonomic navigation system and dead reckoning (DR) algorithm based on two-step recursive filtering are proposed in this paper.

给出了基于两步递推滤波的车辆自主式导航系统模型及其航位递推算法。

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