Research On Logistics Vehicle Monitoring System Based On Beidou

Bei Dou Navigation Satellite System(BDS)is widely used in various fields since its establishment and operation.The space-time information provided by the system plays an important role in the logistics vehicle monitoring system.Aiming at the problems like inaccurate positioning information and unreliable communication transmission of monitoring information existed in the logistics vehicle monitoring system,the method based on Satellite-Based Augmentation System to improve the accuracy of BDS positioning for the logistics vehicles has been verified in this thesis.The monitoring information transmission technology of 4G/ BDS short message fusion is studied,and the logistics vehicle monitoring system based on BDS has been designed.In this thesis,the specific research work and innovations are as follows:(1)The positioning theory and positioning errors of BDS are studied.The cellular mobile communication technology and BDS short message technology are introduced,and analyzed combined with the studied logistics vehicle monitoring system.(2)A method based on the correction of Satellite-Based Augmentation System to improve the accuracy of BDS positioning has been verified.On the basis of studying the theory of Satellite-Based Augmentation System,the correction methods of Satellite-Based Augmentation System aimed at troposphere,ionosphere,satellite ephemeris and clock bias are analyzed.The results of basic positioning and augmented positioning have been verified and analyzed by using the actually measured data of BDS.The results show that the method proposed in this thesis can effectively improve the accuracy of logistics vehicle positioning.(3)Aiming at the problem that the bias exists between the monitoring motion trajectory of logistics vehicles and the actual motion trajectory of the vehicles,the Kalman filtering algorithm of logistics vehicle positioning data is studied,and the motion model of the logistics vehicles has been established.By using the actually measured data of motion trajectory of the logistics vehicles,the algorithm has been verified and comparatively analyzed.The results show that the application of the Kalman filtering algorithm can effectively solve the problem of the logistics vehicle positioning bias.(4)On the basis of the above research,the communication technology of 4G and BDS short message is studied.The logistics vehicle monitoring system based on BDS has been designed,including the design of hardware and software of the system,and the early warning function of the electronic fence has been innovatively designed.By testing the design functions of the logistics vehicle monitoring platform,the running result of the whole system has been verified.The test results show that the logistics vehicle monitoring platform has achieved the functions of information display,data access,trajectory’s playback,electronic fence,video monitoring and custom two-way communication.The problem of status monitoring of logistics vehicles has been solved well by the studied and designed system.The achievements obtained by the research of BDS and the logistics vehicle monitoring system in this thesis have provided a superior solution to the problem like the improvement of vehicle positioning accuracy and the transmission of status monitoring information.The results of the research have superior application prospects of engineering in the fields like the design of logistics vehicle monitoring system.