基于ITS的智能车辆定位导航系统可划分为三个层次：自主导航系统、单向通信系统和双向通信系统。

Based ITS Intelligent Vehicle location and navigation system could be divided into three levels: autonomous navigation systems, communications systems and two-way one-way communication system.

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运用北斗双星导航定位系统的双向短报文通信技术，实现了区域报警和行驶车队之间的通信以及寻迹。

It also realizes area alarm, communication and seeking among the running vehicles depending on BeiDou 's both-direction and short-message communicating technique.

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首先，通过双星定位系统双向链路获取定时定位信息，将双向测距数据及时问同步误差数据进行处理、保存；

At first, synchronization information from the Tow_stay located system, disposes and saves the data of synchronization time and distance detacted.

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