城市车辆综合导航定位系统

Integrated system for vehicle navigation and positioning in urban area

为了解决香港等大城市的车辆连续高精度定位问题,设计了一种基于GPS的多传感器组合定位系统。由于城市高楼密集等情况会出现GPS盲区,且多路径效应影响较大,单纯的GPS导航定位难以满足使用要求。GPS与航位推算(DR)的组合导航系统只能实现短时间内的高精度定位,将GPS/DR与地图匹配(MM)、数字信标(DB)组合构成综合导航定位系统可有效解决城市车辆的导航与定位问题。该系统采用MM结果修正DR系统累积误差,采用神经网络实时辨识导航系统中的GPS多径误差。在香港特区的大量现场试验表明,该系统定位精度优于20m,运行稳定可靠。

A multi-sensor combination positioning system based on GPS was designed to obtain vehicle＇s continual and high-accuracy location in Hong Kong. Simplex GPS is not fit for vehicle navigation in urban area because of ＂GPS blind region＂ and multi-path errors due to complicated environment. GPS/DR system can reach high precision only in short time. In this paper, integrated GPS/DR/MM/DB system was studied to realize precise vehicle navigation in urban area. The system applies map-matching data to revise the DR system accumulated error, and uses the neural network real-time identification guidance system to revise the GPS multi-diameter error. A field test in HK was performed, and the result shows that the positioning accuracy is less than 20 m, and the system runs steadily and reliably.