Design Of Vehicle Anti-theft Alarm System Based On Network Real-time Information Acquisition And Transmission

As the vehicle industry is developing continually, the new registration and annual growth of vehicles in our country have reached the highest level by the end of 2015. At the same time, vehicle stolen events increase rapidly and bring huge losses to vehicle owners, so vehicle safety has been a problem which is commonly focused by society. Now there are many kinds of anti-theft products in markets, but most of them have certain limitations, they can’t alarm immediately or acquire images so that the owners can’t get the stolen information right away. So we need to use GPS localization technique, radio-frequency technique, internet technology and other advanced technologies together to design vehicle alarm system with low price and independent brand combining with the demand of domestic market, and this is the development trend of domestic vehicle electronic security technology.According to above problems, this paper designs a vehicle anti-theft alarm system based on network real-time information acquisition and transmission which can be fit for independent brand vehicles. The vehicle alarm device combines infrared electric sensor technology, GPS localization technique, wireless communication network technology and image acquisition technology. Infrared electric sensor combining with sending and receiving can convert the reflected beam into electric current and transfer it to integrated circuit, then the amplifier magnify and output it. GPS receiver can measure the distance between position known satellite and user receiver, then it can get the location through synthesizing data of many satellites. Wireless communication network permits users to build distant wireless connection to realize the transmission of voice, short message and image message data. Imaging sensor captures images using photosensitive elements in order to get clear image information.This paper designs the system mainly in two prospects which are hardware and software, introduces hardware circuit and software programming of each functional module in detail, designs the PCB board of the system and finishes the vehicle anti-stolen alarm system at last. The research process of this paper mainly includes three parts: firstly, determine the function that needs to be finished in the system and the specific implementation method after understanding the advantages and disadvantages of existing vehicle alarm systems in markets and functional requirements of vehicle owners; secondly, design the overall architecture of the system according to the functions need to be implemented and determine types of core chips which are suitable for this system in each module; thirdly, study and analyze all modules deeply and use development board to implement the whole system, including hardware connection and software programming; finally, study Altium Designer, use this software to design the schematic diagram and the PCB diagram of the whole system and then make the board and debug it realize system functions.The vehicle alarm system can mainly be divided into five parts, including host module, infrared electric module, communication module, GPS module and image acquisition module. Using the infrared monitoring, if the vehicle is started with the owner, the infrared electric module needs to be closed in advance, if the vehicle is started illegally, the system will be triggered to acquire images and send alarm short message to the preset mobile phone through wireless communication module. The main technical indicators of this system are as follows: 5 pairs of phone numbers can be preset; GPS positiona I accuracy between 1 meter and 5 meters; operating voltage is between 3.3V and 5.0V; infrared sensor distance is between 3cm and 80cm; 300000 image pixels; maximum distance to monitor is 15 meters. Comparing with existing anti-stolen products in markets, this product has the function of real-time network alarm, incident scene record, simple and convenient installation and so on, the price of it is only about one third of existing products with the same type, so it has expansive market economic value.