Design Of Searching And Positioning System Based On Beidou /GPS Dual Mode Satellite

As the development of urbanization, city chaos intensified, and the cases of the old man lost as well as abducted children are growing. The safety of children and other vulnerable groups has become the focus of attention of the whole society. Today, there are relatively small positioning devices on the market, while dangers are always being around them. Guardians need to grasp the scope of their activities in a timely manner, in order to ensure their personal safety, otherwise there may be a tragedy. In view of the above questions, this paper carried on the based on Beidou/GPS dual-mode satellite navigation system for searching and positioning system design platform, the system for the vulnerable groups monitoring, individual combat system has quite important application value in engineering.On the basis of the basic principles of the satellite navigation and positioning system analysis, the searching and positioning system overall design scheme, key to carry out the system in dual-mode positioning terminal, GSM communication network and remote monitoring center of each functional module design and technical argument. A design of GSM communication network, mainly use the advantages of the GSM covering a wide range, convenient and data transmission, It makes the fast and reliable positioning of the cooperative target realized. through STC12C5A60S2 micro-controller control communication modules SIM900 A send location information messages. The remote data transmission of the state monitoring information of the cooperative object is realized. In the design of the remote monitoring and control center, the main use of visual Basic6.0, JavaScript as a development tool, through the PC serial port control GSM receive text messages and decodes PDU, then resolve the location information conversion, and display the fixed location in Baidu map.The visualization of the state monitoring information of the cooperative object is realized, which provides a reliable platform support for the positioning and tracking.Experimental results show that dual mode cooperative target based on GPS/ Beidou the positioning accuracy can reach within ten meters, which meets the relative requirements. In addition to the positioning function, the system can not only realize monitoring but cross-border alarming and other functions. The system not only can be used to track location, can also be used for searching and rescuing. It meets the vulnerable groups monitoring and positioning function requirements. In addition, search positioning and tracking system design can realize dynamic monitoring and cross-border alarm function.