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

With the development of economy,the volume of private cars in china is more and more,private cars bring people with convenient transportation,at the same time,they have the risk of pilfer which makes people suffered huge economic loss, car theft has become a big public hazards of the world.The vehicle theft-against technology experienced the development phase of mechanical,electronic,the type of chip and network.In domestic,takes the cost into consideration, electronic vehicle theft-against system has occupied the mainstream position,the network vehicle theft-against system based on GSM/GPS is the latest security technology,also the research pot of current car theft-against system.In the market,ordinary car burglar alarm has some drawbacks such as the function is singleless,low reliability and lack of effective tracking monitoring,according to them,this article designs a network vehicle theft-against system based on GPS/GSM,meanwhile,the embedded way of cable sensors that most network theft-against systems use have problems such as not convenient to install﹑easily been damaged,raises theft alarm system based on wireless sensor network.Once the car was stolen,sensor nodes would send status information of cars to control nodes of theft-against system through wireless network,and then send data to microcontroller through serial port by control nodes.After calculation and treatment,microcontroller will control GSM module to send information of cars to owners.Owners could use mobile phone to control car modules to cut off oil supply circuit,let the car cann’t be started,if the car has been drived away,first receives positional information by GPS receiver,and then send it to owner by GSM module.The paper discusses basic principles which involved in network vehicle theft-against system,including basic principle of GPS positioning,GSM short message agreement in data exchanging and processing of the system,AT instructions and NMEA-0183format,basic principle of wireless sensor network.lt uses modular design idea to introduce car terminal hardware design of network car theft-against system,and detailed analyses design principles of each circuits and reasons of parameter selection,it designs sensor nodes and each component modules of controller of alarm system.Meanwhile,it designs control and data processing software for the whole system, independent software modules for data exchanging of GPS module and GSM module,it’s convenient for the master control module to call function modules.The system is different from other network theft-against systems,which puts wireless sensor network that consists of several acceleration sensors to use in vehicle theft-against system,it improves reliability of the system because when a node is invalid,it could still keep the alarm system working normally.