基于区域划分的GPS/DR组合导航定位研究

建立广域车辆定位导航系统的服务区区域划分，在此基础上实现了GPS定位模式切换、建立分层地图数据库和实现通过路网数据对GPS及推算定位的结果进行匹配的快速匹配算法。对车载导航系统的中心模块进行了相应的改进，实现了基于区域 发和地图分级思想的车辆定位导航系统基础模型，并结合成都中心区和广州市的试验结果进行了分析。分析表明，区域划分思想用于车辆定位导航系统，可以提高系统的总体性能。基于该思想实现的车辆空平导航系统模型不仅能在局域，而且能在广域范围内提供满意的定位导航服务。

GPS/DR Vehicle Location and Navigation System: A Region Division Approach

A region division approach for vehicle location and navigation is presented, which is based on GPS technique, dead reckoning (DR) and the map matching of digital road networks. In order to meet the needs of wide applications, a region divided model for the vehicle location and navigation system (VLNS) is established. Based on this model, a systematic analysis of the central module, and an outline design of the VLNS are discussed on the following issues: (1) the dynamic switch of the working mode between GPS and CDGPS (conventional differential GPS), (2) the layered map database and the dynamic compile of the layered map, and (3) the improved map matching algorithm that compensates the positioning errors of GPS and dead reckoning with the aid of digital map. It has been proved that with the region division approach, the performances of the VLNS get improved. The VLNS model built in this paper can provide high precision application not only for local area, but also for wide area users.