摘要： 针对当前智能公交系统中电子站牌缺少车内拥挤程度显示的问题，设计全新的图形化公交站牌，提出一种基于超声波技术的拥挤程度检测方法。结合超声波测距、全球定位系统和通用分组无线服务技术改进传统车载终端，通过超声波测距确定各个超声波传感器下是否有乘客站立，对检测到乘客站立的传感器数量进行统计，以此推断车内的拥挤程度。设计开发图形化公交站牌，实现拥挤程度实时检测、行车路线实时标注和到站距离预测等功能。实验数据表明，该系统可靠性高，能准确反映车内拥挤程度，直观显示车辆位置，准确预测到站距离，满足智能公交系统的要求。

关键词: 智能公交系统, 超声波测距, 全球定位系统, 通用分组无线服务, 电子公交站牌, 多线程

Abstract: According to domestic current situation that electronic bus-stop board is lack of revealing the crowdedness degree, a new graphical one is designed in this paper. A new method on revealing the crowdedness degree based on ultrasonic test technology is proposed. This paper designs an intelligent public bus vehicle equipment combining with Global Positioning System(GPS) and general packet radio service technique. The ultrasonic sensors detect whether there is anyone standing on by ultrasonic test. MCU counts all the sensors which detect the passengers and estimate the crowdedness degree. It develops a graphical electronic bus-stop board. The system implements some functions, such as revealing the crowdedness degree, vehicle tracking, the bus arrival distance prediction, etc. The system carries out many experiments. The results prove that the system is with high reliability, high accuracy of revealing the crowdedness degree and it visually displays the bus location and the arrival distance in the bus-stop board. It meets requirements of Intelligent Transport System(ITS).

Key words: Intelligent Transport System(ITS), ultrasonic ranging, Global Positioning System(GPS), general packet radio service, electronic bus-stop board, multi-threading

中图分类号: 

• TP39