Design And Implementation Of Vehicle Monitoring System Based On Geofencing Technology

In recent years,with the continuous growth of domestic vehicle ownership,the frequency of traffic congestion and accidents is also increasingly high,which puts forward higher requirements for vehicle management information.As an important part of intelligent traffic management system,vehicle situation display system provides users with the function of vehicle operation distribution situation display.With the gradual maturity of Web GIS(Web Geographic Information System)technology,the vehicle situation display system is designed and built based on Web GIS technology according to the front and rear end separation architecture,and combined with geo-fencing technology,the position relationship between the vehicle and the fence can be automatically perceived.Regionalized vehicle positioning monitoring has important research significance and practical value in vehicle fine control and situation display.Therefore,aiming at the requirements of intelligent vehicle management in a military test park,this paper designed and implemented a vehicle situation display system based on geofencing technology in order to realize visualization,fine management and control of vehicles in the park and improve work efficiency.The system adopts the front and back end separation development mode,and takes Web GIS technology,geofencing technology,Spring Boot framework,My Sql database scripting language,Vue3.0 and Element-UI as the technical stack to realize the system.The main work completed in this paper is as follows: 1.Following the principle of open source,easy to use and high efficiency,this paper proposes the design and implementation scheme of lightweight Web GIS vehicle situation display system,without the need to build GIS server and GIS database.Based on the latest technology stack,a user-friendly,functional and independent vehicle situation display system with each module is designed and implemented.2.In order to solve the problem of vehicles crossing the boundary at will,geofencing technology was introduced to design and implement an efficient and robust lane crossing detection algorithm,which can be divided into three steps:(1)Safe boundary algorithm:the park lane uses the safe boundary algorithm to establish the safe boundary,and converts the vehicle lane change problem into a point inclusion problem.(2)R index tree: R index tree is built at each node of the security boundary,and R tree can be retrieved to quickly locate the surrounding polygons when crossing the boundary detection.(3)Linear equation algorithm:Based on the idea of judging the relationship between point and line position,a linear equation algorithm is proposed to solve the problem of point inclusion and improve the detection efficiency.3.The system calls the 2D and 3D integrated map engine API of Web GL(Web Graphics Library)and carries out secondary encapsulation.Web Socket full-duplex communication is used to realize real-time display of vehicle situation and other GIS display functions,and the browser directly processes the spatial data.It eliminates the dependence of traditional Web GIS on GIS server and GIS database,and avoids the performance cost caused by traditional AJAX(Asynchronous Java Script and XML)polling.It can display the location of hundreds of vehicles in real time.As mentioned above,the system builds a situation display platform with efficient vehicle management and behavior detection.As a part of the intelligent management system of the park,the system is currently running well and has achieved the expected application effect.The test and application show that the crossing boundary detection algorithm of the system is efficient and robust in judging the data,and the principle of the internal linear equation algorithm is simple,which avoids the singularity problem existing in the ray method,and has a high reference value for solving the problem of point inclusion and related scene application research.