Design And Implementation Of Pulic Transportaion Information Service System Based On On-board Sensing Grid

With the continuous development of intelligent public transportation,research that related to the public transportation information service system is becoming more and more.Currently it mainly includes:intelligent monitoring and scheduling system,bus-stop auto-announce system,on-board sensing system,passenger boarding guide service system.But the on-board sensing data that collected by the current information service system and the service that supported by the current system are still relatively simple,the system of each other is basically independent,the system of perceived data can not be shared with each other.And at present,these public transportation information service system is mainly based on the public transportation real-time position information,transfer quantity and amount of walking,but it lack of the integration of real-time environmental information and the number of people in the car.Aiming at the defects and shortcomings of the current public transportation information system,a public transportation information and service system that based on on-board sensing grid is proposed.Take advantage of the on-board sensing grid which based on heterogeneous sensor networks and ZigBee technology,the system can flexible sensing the multi-information from inside and outside of the bus,and finally developed to be a multi-information gathering center.This approach can improve the perception ability of the current information service system,and provide data support for public transportation service and environment research.In addition,based on the fusion preprocessing of sensing data with the embedded Linux gateway,the distributed computation of the whole system is realized,and the operating efficiency of the system is improved.Finally,through the access to the Baidu LBS open platform,the open multi-dimension WebGIS information service platform is built,which can be integrated with the public transport real-time location information,traffic information,the number of people in the car and environmental information,to achieve a more meaningful travel guide service.For the design and implementation of the system,the main innovation points of this paper are as follows:Firstly,for the design of heterogeneous sensor network,this paper adopts a distributed deployment,which enhance the sensing ability of the system.Secondly,for the wireless sensor network,the increase of the sleep nodes in hardware and the increase of the re-transmission mechanism in software improved the fault-tolerant ability of the network.Thirdly,the method of traffic congestion rate based on location information is put forward through the real-time on-board GPS data and historical data.Fourthly,this paper introduce a data-based bus star service system through the integration of vehicle perception data.In the end,the operation of the bus information service system is verified by the test of basic function and the integration testing.