将GPS定位技术和航位推算（DR）技术结合起来，可以很好地解决这一问题。
This problem can be solved by the combination of GPS positioning technology and DR technology.
利用GPS模块提供的位置数据进行定位，利用DR模块在失去GPS信号的情况下进行航位推算，从而实时的地为用户提供位置信息。
Using GPS module to get the data of position and using DR device to aid GPS module, the system can provide the users with the real-time location information.
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。
The model of vehicular autonomic navigation system and dead reckoning (DR) algorithm based on two-step recursive filtering are proposed in this paper.
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