| With the improvement of people's living standard, cars have increasingly become a part of the common people's lives. The number of cars increased, the number of vehicle thefts increased year by year. Fearing theft of vehicles has become a concern for every vehicle owner. Therefore, study on high-performance automotive anti-theft alarm system has an important application value. At present, the rolling code encryption technology and wireless remote control technology are already very mature. Those technologies have been introduced into car anti-theft system. It is a new development direction.The issue puts forward a without user intervention intelligent key system. This new type of intelligent key system uses the rolling code technology and radio frequency identification technology, users only need to close the door, the door lock will automatically open. This system not only can recognize user identity without keystroke, security and convenience, but also can makeup automobile tire pressure monitoring system, car alarm and so on. So it has stronger promotional value.This paper first introduced the basic principles and structure of automobile anti-theft system, thus described the technologies of rolling code encryption.Then introduced the system's hardware structure, including the system power supply circuit, the microprocessor PIC16F639, high-frequency transmitting and receiving circuit, low-frequency transmitting and the receiving circuit, as well as the external detec circuit and control circuit.Software design analyzed the rolling code security encryption mechanism and data processing including radio data receiving algorithm, rolling code software decryption algorithm, microprocessor communication agreement and applied system controlling flow.Finally, the functionality of the system was tested. The test results show that this system using the single-chip PIC16F639 and receiving module TDA5201 is stable, reliable, easy to operate, and meet the design requirements.
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