Design Of Vehicle Theft-against System Based On GSM/GPS

With the economic development, the vehicle theft-against technology has upgraded from the original mechanical mode to the latest GSM/GPS-based network mode after several generations. But in China, considering the price and technology, the common electronic vehicle alarm equipments are still the dominant ones.In view of the deficiencies of most common vehicle alarm equipments prevalent in the market, such as single alarm ability, low security and lack of tracking and monitoring ability, Moreover, most of the network theft-against systems are made by integrating a high main frequency embedded CPU and an embedded WinCE or Linux operating system, but this paper designs a vehicle theft-against system based on GSM communication platform and GPS satellite positioning by integrating a lower hardware scheme circumstance, to combine positioning with against theft function of vehicle, to enhance the development efficiency, also is advantageous for software and the hardware later period maintenance and the revision.Integrating the traditional vehicle alarm technology and GSM/GPS technology and according to the designing principles of embedded system, the system builds up a mutual platform among the vehicle owner, the monitor center and the vehicle by using the vehicle monitor and control protocol based on GSM short message. Vehicle owners and the monitor center can monitor the state of the vehicle and send controlling instructions by means of SMS, so as to realize all-directional vehicle alarm and monitor.This article elaborates basic principle of vehicle localization and the theft-against system, including protocol of SMS(GSM07.05), the PDU format, AT Instruction and the protocol of navigation(NEMA-0183)used in the system. Simultaneously, the construct of hardware is introduced in detail,including power circuit of system,Microcontroller MSP430F149,wireless GSM telecommunication module TC35,GPS module and outer control circuit. Uses the modular method in the software design, soon the overall system software divides into several big modules: System module, security interface module, GSM processing module and GPS processing module and so on, for master control module transfer; Using the VC6.0 designs in the position machine monitoring software, completes to the GSM module correlation instruction test and the SMS receiving and sending function.Different from other network vehicle alarm systems in the market, the system can refit some common vehicle alarm equipments, which have been already fixed on the vehicles, into network vehicle theft-against systems. Consequently, the expense of the user can be greatly reduced and the performance-price ratio of the product increased.