Design And Implementation Of A Vehicle Trajectory Reconstruction Info System Under Mobile Environment

In recent years smart mobile devices become increasingly popular, providing personal daily life, business operations management with more convenience.Meanwhile,enterprises have a practical demand of recording the trajectory of the vehicle in management,then, more effective vehicle scheduling management will be achieved by meeting this requirement.This paper mainly aims to focus on the application and practice of Android based intelligent mobile device in the vehicle track acquisition system.Through GPS positioning,the real-time position information of the vehicle can be obtained with the android intelligent device fixed on the vehicle.Then,we can acquire the vehicle track and compute the driving distance by collecting the GPS positioning information.But GPS positioning is vulnerable to weather, building shelter and other factors,leading to lack of location or large deviation phenomenon.So other methods are needed to aid positioning while GPS positioning is missed or accuracy cannot meet the requirements,thus to compensate for positioning and correct positioning results as far as possible.In order to achieve better positioning effect,motion sensors equipped in mobile device can be used for dead reckoning to repair the influence of lack of location or GPS positioning drift.This paper utilizes the sensors built-in android mobile device for dead reckoning,and then fusion the DR and GPS positioning data to tune influences caused by lack of GPS positioning or GPS drift.On this basis, the paper will design and implement a vehicle trajectory capture info system in mobile environment.Generally,this system is composed of three major parts,the android client,the server and the query website.The system locates the vehicle real-time position with the android mobile terminal,and then compensate or correct location failure or unreliable positioning precision by using dead reckoning.The android client collects positioning points and computes the driving distance, and then,based on XMPP protocol, it send these data to the server, which will resolve and restore them.When necessary,the query website will read positioning points from the database to draw vehicle trajectory on the electronic map.Through actual experiments, it was proved that this system can finely obtain vehicle trajectory information.