Research On Vehicle Terminal Based On Beidou Differential Location Technology

China’s Beidou satellite navigation system（BDS）has experienced Beidou’s first generation,second generation evolution,gradually stabilized,able to provide accurate location services in some areas,such as the entire Asia-Pacific region.And national planning,five years later to achieve global coverage of the location^[1].The emergence of the Beidou positioning system to a large extent changed the status of over-reliance on the US GPS positioning system,and in many areas can replace the GPS system applications.For some basic vehicle personnel positioning,3m-5m positioning accuracy of Beidou system can be completed^[1].However,for more and more high-precision positioning needs,such as driving test applications,such as smart agriculture,such a positioning accuracy is clearly not enough.The United States of America GPS system proposed by the differential positioning technology to improve the positioning accuracy,which can achieve sub-meter or centimeter-level positioning,which in the field of high-precision positioning has been very good application.China’s Beidou satellite navigation system in this area set foot in late,a lot of technology is not perfect,but the technology needs to continue to develop mature.Therefore,after consulting a large number of literatures,Under technical feasibility,this paper puts forward a design scheme of car terminal based on the Beidou differential positioning technology,which is based on the Beidou differential positioning technology,with wireless network transmission as the condition,Background management,and then to achieve a car-centimeter-level positioning,and real-time upload location data.The main contents of this paper are summarized as follows:（1）Firstly,the realization principle of the Beidou differential technology is discussed.The whole Beidou differential positioning system consists of the differential reference station,the positioning terminal and the antenna.This project mainly involves the design and realization of the vehicle positioning terminal;（2）From the selection of positioning board to the hardware design of the terminal,PCB production and software design are introduced,and one of the communication module,IC card recognition module made a detailed description;（3）The design of a more comprehensive surveying process,and the performance of the terminal measured,obtained the ideal results,to achieve high-precision positioning needs.The highlights of the paper are as follows:（1）The vehicle terminal in the realization of centimeter-level positioning at the same time,with the use of dual-antenna mode,you can achieve the dual function of orientation and positioning data can be uploaded to the background real-time wireless network management analysis;（2）The vehicle terminal in the high-precision positioning to meet at the same time,to a certain extent,reduce the cost,can be used more practically in some simulated driving test,intelligent agriculture and other fields.