Research And Implementation Of GPS/DR/GPRS Integrated Positioning And Monitoring System For Vehicles

With the rapid development of national economy, the number of private cars gets more and more, but automobile theft has become a serious public nuisance in the world and brings enormous economic losses to people. Therefore, using vehicle GPS/DR(Global Positioning System/dead reckoning) combined positioning system and GPRS communication technology to monitor can not only antitheft, but also overcome the disadvantage that the GPS positioning can not position when using GPS positioning singly in the case of object shelter. It will play a significant role in tracking stolen vehicles.Firstly, this article further studies the key technologies of GPS/DR/GPRS positioning and monitoring system. Based on characteristics of high real-time and small amount of data transmission of vehicle monitoring systems, the article proposes and designs embedded hardware structure program of vehicle positioning system basing on embedded ARM9 processor S3C2410A, GPS + GPRS two in One module, acceleration sensors, piezoelectric gyroscopes and other hardware modules, and describes design process of the system hardware circuit in detail. The article determines using Kalman filter algorithm of the optimal filtering theory to fuse data of GPS/DR combination system, it can ensure that the system has high accuracy and good dynamic performance. The article uses real-time characteristic of embedded Linux operating system to achieve real-time data collection of multi-channel, and uses multi-threading technology of Linux to solve concurrent execution of positioning data processing, body state detection, data communication and other tasks. Finally, it achieves cutting and transplanting of software system.The system uses an improved federated Kalman filter algorithm to fuse GPS and DR location information optimally, so as to solve the shortcomings of a single location technology and improve positioning accuracy. Users can achieve remote monitoring cars through the GPRS network, do not need real-time location monitoring, and access third-party information service only when needed; it will save the cost of service largely. The system can be installed easily and have high reliability and performance-cost ratio. It will be the trend of future development, and have high application value.