Research And Design Of Smart Community Defense And Security System

Defense and Security System is a very important subsystem of smart community intelligence system. In modern smart community, advanced technology should be used in order to ensure the security of resident's life and wealth. At present, Most of popular defense and security products are based on BACnet or LONMARK standard internationally, and natively it's difficult to integrate different popular defense and security products from different Corp, because different Corp adopts different technology and interfaces.After studying the progressing trend of international defense and security products and comparing BACnet standard with LONMARK standard, I think that, in China, adopting BACnet standard is more proper, because it's more opening and provided with stronger ability to process information. BACnet standard provides a new progress chance for native building automation field.The research and application of defense and security system based on BACnet standard are still in a progressing stage natively, but internationally there have been successful engineering cases. BACnet is an open protocol, everybody,every organization could realize it. Protocol is the soul of communication. It makes important sense to realize BACnet protocol for developing defense and security system products. This paper only does some junior research works, there is still many works to do, such as: realization of protocol coding, realization of network layer, realization of data link layer and so on.There are seven chapters in this paper. Third,fifth and sixth chapters are the main parts of this paper. First chapter describes the background,meaning and progress trend of this subject. Second chapter describes some main technologies in this paper. In third chapter, after studying the theory of defense and security system, doing some whole design works of defense and security system and design a defense and security system framework. Forth chapter gives design schemes of each subsystem which is referred in third chapter. Fifth chapter researches BACnet protocol, and the main point is BACnet application layer protocols, this chapter researches BACnet application layer modal, application layer services , application layer time sequence diagram and realizes BACnet application protocol data unit with C programming language. Sixth chapter gives a network security framework and realizes logging on process based on digital certification which is located at Usb Key. Usb Key is a hardware device which could store,encrypt,decrypt digital certification.