定位系统在智能交通系统中的应用

摘要

In this paper Intelligent Transport System(ITS) and role of positioning systems in ITS will be discussed. At the present there exist two different positioning systems. The first ones are satellite-based systems and the second ones are terrestrial-based systems. Each system has a different properties. The properties in terms of cost, accuracy and coverage for each of these two systems will be discussed. Then it will be described the main types of these systems and the positioning techniques in mobile networks. In conclusion, A-GPS will be mentioned which is a positioning technique combining these two kinds of system.%文章讨论了智能交通系统(ITS)以及定位系统在ITS中的作用.目前存在两类不同的定位系统,第一类是基于卫星的定位系统,第二类是基于地面的定位系统,每类系统各有其特点.首先讨论这两类系统在成本、精度和覆盖范围方面的特性,然后介绍系统的主要类型以及在移动通信网络中的定位技术.最后,介绍了两类定位系统相结合的定位技术AGPS.