节点文献
安防报警系统
Security Alarm System
【作者】 张蒙;
【导师】 周先谱;
【作者基本信息】 内蒙古科技大学 , 控制理论与控制工程, 2009, 硕士
【摘要】 安防系统是都市实现信息化和现代化安全的重要组成部分,可以有效地强化城市管理,保证家庭安全。目前安防报警系统采用声光电报警技术,智能报警技术,网络报警技术。存在的最大问题是:几乎所有解决方案都必须采用一定功率的辅助电源(通常是交流电源)供电,这不但增加了系统成本,安装空间,而且一旦电源被切断,整个系统将彻底丧失安防功能。由于所有设计都没有采用低功耗设计,使得采用辅助备份电源也变得非常困难。因而成为制约安防系统性能的关键瓶颈。通过电话线路实现报警信息信息链接的基本手段,利用电能窃取技术从电话线路获得电源并配以辅助电源的方法是改善安防系统供电可靠性的有效途径之一。然而,电话线路只能支撑约500微安的负载,这成为采用电话线路供电的基本障碍。本文试图通过对一个基本的安防报警系统各个环节进行低功耗设计,以最大限度地降低安防报警系统的平均能耗,进而实现采用电话线路供电的解决方案。本文首先分析比较了目前常用安防报警系统应用技术,在此基础上以低功耗单片机MSP430F2001为核心构建了一种基于DTMF基本安防报警系统架构。采用低功耗热释电红外传感器及其解决方案实现基本入侵检测;同时以HT9200A构建了报警拨码系统;并较为深入地研究了DTMF的基本原理和硬件解码、DTMF软解码算法性能及实现技术,最后提出了基于比较器的DTMF软解码算法,该算法节省硬件资源,优化了解码过程,并显著降低了解码硬件电路的能耗。从而是整个电路的待机能耗降低到了采用电话线路供电可接受的能耗范畴;完成了整个安防模拟系统的全部软件、硬件设计。由于该系统作为基本功能验证,没有设计辅助电源、无线报警、个性化用户电话号码设定等人机接口功能。无论是解码算法的离线仿真,还是该模拟系统的运行都证实了软件解码与实际系统的可行性,具有一定的推广应用前景。
【Abstract】 The security system can promote the city’s image, strengthen the management of organization, and guarantee to provide good service, is an important part in an advanced city. At present, security alarm system, such as the use of photoelectric alarms technology, the smart alarm technology, network technology, did not solve the problem which must be a certain power, auxiliary power (AC power) supply, which increases system cost, installation space.once the power was cut off, the whole security system will be completely lost function. Since all designs are not a low-power design, it which makes use of auxiliary backup power supply has become very difficult. Thus that becomes a key constraint of security system performance.Alarm information through the telephone lines achieves the basic means of information links. The use of electrical energy from the telephone line obtains the power and auxiliary power supply coupled with the method is to improve the security system, which is one effective way of power supply reliability. However, the telephone lines can only support a load of about 500 uA, which uses telephone lines to become a fundamental obstacle to power. This paper attempts by a basic security alarm system to all aspects of the low-power design, in order to minimize the security alarm system, the average energy consumption, so as to realize the use of telephone line-powered solutions.This paper analysis and compares current the security system in common, and set up the structure of security system that based on the DTMF and completed the system hard, software development and design the work. The system takes the Low -Power chip microcomputer MSP430F2001 as a core, and it achieves the function such as the alarm deletion and identification through the Low -Power electric circuit such as the Low -Power infrared signal processing chip, sensor, the HT9200A,Because the system ascertain the telephone number,the paper studied the DTMF basic principle and hardware decoding, DTMF decoder algorithm and realizes the technique thoroughly, at last,the paper analysis the DTMF decoder algorithm based on comparator saved hardware source and time and the power consumption. thus,the entire circuit of the standby power consumption of using telephone lines has an acceptable power supply area.As same time, the entire security system of the software and hardware design has been completed.As the basic functional verification, there is no auxiliary power design, the wireless alarm, the user settings of personalized phone numbers, and others interface functions. Whether decoding algorithm off-line simulation, or the operation of the simulation system have confirmed the software decoding and the actual feasibility of the system with a certain degree of promotion prospects.