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基于传感技术的家庭防盗系统的设计与实现
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摘要
防盗系统是保障公民人身及财产安全的重要设备。在当前科技高速发展的形势下,传统的防盗措施对于新型作案工具而言,显得有些不足。因此,针对现有防盗设施弱点,设计和开发一种新的防盗方案,快速的发现和阻止行窃行为是有必要的,这对于保障个人财产的安全,维护社会和谐稳定具有一定意义。
     论文设计的防盗系统是以一个家庭或类似的局部区域为基本单位,系统从功能上可以分成三个部分,前端监控部分,数据处理和传输部分和监控中心。论文设计的是前两个部分,一部分是由前端的负责监控人体信号各个传感器节点,另一部分是负责实现通信处理的中心处理节点。将传感器节点安装在门或窗的上方,一旦有人在系统激活状态下进入感应区域,就会被传感器节点检测到,传感器节点会立即将状态传送到中心处理节点。中心处理节点则负责将报警信息传送给小区的监控中心,由监控中心派出安保人员来阻止潜在的行窃行为。与此同时,中心处理节点通过短信来通知用户进行后续处理。
     论文的传感器节点热释电红外传感器来检测人体的红外信号,由ATmegal6单片机来实现对信号的获取,再通过有CC1100芯片为核心的射频电路将感应到的信号传送给中心处理节点。中心处理节点的主芯片采用基于ARM内核的LM3S8962单片机,同时在中心处理节点上提供了一个用于向小区监控中心示警以太网接口和一个用于向用户发送报警短信的ME3000GPRS模块。中心处理节点上集成了μ C/OS-II嵌入式操作系统来管理系统的软硬件环境,同时还集成了基于LWIP的TCP/IP协议栈,用于完整的以太网通信。
     系统采用主动检测的方式,较之视频监控方式,虽不直观,但可以减轻监控人员的工作负担,而且系统的反应速度快,也避免了人眼疲劳所造成的疏漏;较之红外对射的监控方式,论文所需要的设备较少,因此可以节省成本,且传感器具备区域覆盖能力,安装在门窗的上方,几乎没有盲区,从而提高了可靠性。
Anti-theft system is an important safety equipment to protect citizens' personal and property. With the current high rate of technological development, the traditional security measurement for the new tools of crime appears to be insufficient. Therefore, for the weaknesses of existing security devices, it is necessary to design and develop a new anti-theft program, quickly find and stop stealing behavior; these have some significance for the protection of personal property security and maintaining social harmony and stability.
     The anti-theft system proposed in this paper take a local area of a family or similarly as the basic unit. System functions can be divided into three parts:Front-end monitoring, data processing and transmission parts and monitoring center. The first two sections are involved in this paper; the front end is responsible for monitoring body signals of each sensor node in the part I, part II is responsible for the center processing nodes of communication processing. The sensor nodes are installed at the top of the door or window, once someone entered the active area when system is active, the sensor node detects and sends state to the central processing node immediately. The central processing node is responsible for transmitting the alarm information to the district control center, security personnel will be sent by the monitoring center to prevent potential acts of theft. At the same time, the central processing node will notify the user for subsequent processing via SMS.
     In the paper, a sensor is used to detect the infrared signals from the human bodies. The sensing data is processed by an ATmegal6MCU firstly, and then sent to the center processing node by a RF circuit with a CC1100chip as a core. The center processing node is designed based on a LM3S8962chip with an ARM as a core, integrated a ME3000GPRS module to sent alarm SMS to the users and an Ethernet interface to connect the neighborhood's monitor center. An μC/OS-II embedded OS is integrated into the center processing node, which can be used to manage the software and the hardware. A TCP/IP protocol based LWIP is also integrated for Ethernet communication.
     Active detection mode is applied in the system. Compared with the video monitor mode, it has the advantages of fast response, reducing the burden of monitoring staff and avoid the mistake caused by human eye fatigue. The system needs fewer equipments compared with the infrared monitor method, which can save the cost. Meanwhile, the sensor with the area coverage can be fixed upon the doors or windows almost with no blind area, which enhances the reliability of the system.
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