Research On Vehicle Traveling Data Recorder Based On GPS/GPRS

Traffic accidents have happened frequently with the increase of vehicles in recent years.It is important to install vehicle traveling data recorder with monitoring function in every car.It can not only supervise the violation operations of drivers,but also analysis the causes of traffic accidents according to the monitoring data.The existing vehicle traveling data recorder has some problems,such as single structure and poor real-time transmission of information.The navigation and wireless communication module was added based on the original basic functions.And combined with the electronic map technology and GPS technology,the vehicle traveling data recorder was constructed.The main contents are as follows:1.The overall scheme of the system was determined according to the existing problems of the vehicle traveling data recorder and the latest national standard.The existing vehicle traveling data recorder has some disadvantages,such as traditional communication mode and poor ability in positioning and navigation.To improve these these disadvantages,GPS positioning,GPRS communication and electronic map module on the monitoring interface were added,so that the system can locate the specific location of the vehicle quickly and accurately.2.The characteristics of analog,digital and switch signals in the vehicle recorder system were studied in different types.The hardware circuit and software algorithm of the vehicle speed acquisition module were designed.The kalman filtering was applied in the GPS positioning system and the mathematical model was set up.The quantity of state real value was estimated out from random disturbance of optimal.Thus the random error of GPS was reduced and the positioning accuracy was improved.3.The hardware circuit and software design of the vehicle traveling data recorder system was studied.STM32F103ZET6 was chosen as the control chip.The man-machine interactive system and multi-level menu display were completed by LCD12864 liquid crystal display and button.Accurate real-time clock was provided using DS12C887 chip.The large capacity information storage was accomplished with the ferroelectric memory and SD card.Vehicle positioning was completed by using the u-blox-NEO-6M chip.Through the functional test,the design scheme of each module was verified.Finally,the overall system and the accuracy of the system were tested.4.The design of the upper computer interface of the vehicle traveling data recorder was finished.At present,Android technology is widely used in the application and development of baidu maps API.The Baidu map database was called by the Web server with LabVIEW for the first time.Programming language was applied to read and parse GPS valid data.The functions of real time displaying the latest address and reproduction of the historical track were realized in the Baidu map,through reverse address resolution and calling vehicle information data sheet.On the LabVIEW software platform,user security login,data transmission and management and the development of baidu map database were completed at the same time.A perfect management platform about vehicle information has been created.