The Research And Development Of Real-time Monitoring System Of Vehicle Trajectory

When people build the urban infrastructure,it is inevitable to use many engineering vehicles.When these trunk transporting construction materials,according to municipal requirements and relevant regulations,usually it is necessary to arrange the driven route and check,which called line monitoring,real-time tracking and display of vehicle location,which called real-time monitoring,divide unload area by electronic map which called electronic fence.At present,the actual situation is that the development and use of real-time monitoring module and electronic fence module are relatively mature.This paper mainly focuses on the online monitoring module.In order to accurately calculate the road of the vehicle,it is necessary to combine road information,vehicle trajectory and map matching algorithm.However,in practice,there are two problems to realize the monitoring of vehicle route.First,it is difficult to obtain the road information data,such as common baidu map,google map all did not provide the corresponding interface can access road information.A method of road information acquisition through consulting literature materials and learning related techniques is put forward in this paper,which is using ArcMap software and the related programming technology,calling the relevant map data service interface,to extract the road information and establish the topological relations between the roads.And then A map matching algorithm is designed for the monitoring system of floating car in the paper.In the procedure of map data pretreatment,we format the original road network data by grid partition and establishing the topology relationship between roads.At the initial matching stage,the candidate road set is the road in the grid where the matching point is located,and the matched road is chosen from the one with optimal weighs.After the first road is matched,a capturing circle of a certain size is set and the road connected with the current matching path is chosen as the candidate road set.The current candidate road set is less quantity and better quality,which greatly speeds up the matching speed.During the matching process,we judge the connectivity of road matched,if the two roads are not directly connected,the shortest path algorithm is started to calculate out the way the car passed.Finally,the trajectory data are collected and the algorithm is implemented by simulation.It is proved that the algorithm has a good matching effect.In the end,the engineering vehicle trajectory monitoring system was developed,and the mapping algorithm was successfully applied to the system.