This system uses the automobile as the development platform. Through the installation of sensor monitoring devices, the collected information is passed to the control system centered on the single chip microcomputer. The alarm information is notified to the user through telephone, SMS (short message service) or MMS (multimedia information service), etc., so as to realize long-distance, accurate and real-time alarm. GPS (Global Positioning System) on the market now can achieve precise positioning and general navigation, but the core technology of GPS is in the hands of the United States. If the United States closes the application in the event of war, the consequences will be disastrous, especially not conducive to military use, so We have adopted GPS and the "Beidou Double Star" dual-mode navigation and positioning technology independently developed by China. 1. Hardware system This system consists of 5 parts: MCU control module, data acquisition module, information receiving and sending module, GPS module and Beidou Double Star positioning module. The data acquisition module uses different sensors to send the collected signals to the MCU. After the MCU analyzes and processes the MCU, it sends control information and alarm instructions to the GSM module, and then transmits the alarm information to the user through the GSM / GPRS network or Beidou Shuangxing to achieve the monitoring alarm. the goal of. According to the user's decision, the system will take actions such as remote shouting and warning, remote photographing and oil cut off to ensure the safety of the vehicle. At the same time, the system also uses GPS and Beidou double-star dual-mode positioning method to achieve all-weather, high-precision real-time navigation and positioning, positioning accuracy can reach 3m ~ 10m. The MCU realizes the physical connection with the GSM, GPS and Beidou Double Star terminals through serial communication, and the one with the PC is reserved. RS-232 serial communication interface. Use the Beidou double-star positioning terminal to achieve fast positioning, and send the location information to the user and the central station through GSM or double-star short communication. At the same time, the Beidou satellite's two-way short message communication function can realize regional alarm. 1.1 MCU control module This module plays the role of receiving, analyzing and processing sensor alarm information and user control information, and is the core component of this system. Its design includes power supply part, level conversion part, memory design part and external interface part (including sensor signal input, MCU control external device signal output display, communication interface between MCU and Beidou Shuangxing positioning module and GSM module). 1.2 Data collection module A variety of sensors are available in the data acquisition module, such as vibration sensors, pressure sensors, switch-type and disconnection sensors, etc. When the car is subject to vibration, the door is opened, or someone is sitting on the seat Different information will be generated, and the different data and information collected by these sensors will be input into the system MCU for subsequent processing. The design idea of ​​this module is to make full use of the existing safe and mature products in the vehicle as the system part. Its advantages are: system security and stability will be greatly improved; it can better solve the problem of system state control. If you only consider the use of mobile phone SMS for arming and disarming, it is not only inconvenient, but also the long-term additional information costs can not be ignored ; It can be modified on the original basis to reduce the cost of the product, at the same time, it can also use the existing on-board equipment reasonably and effectively, so that the resources can be reasonably and effectively allocated. 1.3 Information receiving and sending module Taking the GSM module as the core, the information interaction between the system and users is realized, and the functions of sending alarm information and receiving user responses are played in the system. The module performs data communication through the GSM network without the need to set up an operation center, which greatly reduces the cost of production promotion. The design idea of ​​this module is: use a better open GSM module, and strictly implement the European Telecommunication Union's GSM0707, GSM0705, GSM0338 and other specifications and protocols, to facilitate system software development, and enhance the versatility of system software. 1.4 GPS module GPS technology is very mature in military and civilian applications. By using GPS and Beidou dual-star dual-mode positioning methods, the accuracy of navigation and positioning can be greatly improved. 1.5 Beidou Double Star Positioning Terminal Use this terminal to realize fast positioning, and send location information to users and central station through GSM and double star short communication, and use double star short communication to realize regional alarm. The main functions are: fast positioning, providing all-weather, real-time positioning service for users in the service area, the positioning accuracy is equivalent to GPS; short message communication, can transmit information of up to 120 Chinese characters at a time; precision timing, accuracy reaches 20ns.
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