Design Of Multi-layer Seamless Anti-damage Alarm Systems For Burglar And Fire-proof

This paper studies a kind of anti-damage alarm system,including burglar alarm system and fire protecting system.The system consists of some alarm devices,and every alarm device sends data each other at regular time.If any device does not receive data from other alarms within a specified time,it will send alarm information after a few seconds.For example,there are some alarm devices in a burglar alarm system,if an intruder damages one or more of the alarms,the remaining alarms in the system will be triggered in several seconds.This paper also studies a fire protecting alarm system.The chemical plants,mines,gas stations,office buildings,supermarkets,theaters,residential buildings and other places,need high quality fire protecting alarm systems.When a fire hazard occurs,the alarm may be destroyed by raging fire,and some fire may cause explosion to damage the alarm.If the fireproofing shell is used to wrap the alarm,it will increase the cost of the hardware,and the weakness of the smoke sensor and the temperature sensor is still easy to burn or blow up.This paper uses zigbee as the core device.There are 10 zigbee nodes in the system,and each node is a burglar alarm or fireproof alarm.Each burglar alarm is equipped with a human body infrared sensor.Each node sends data to other nodes in the form of broadcasting,thus all of the nodes construct a kind of alarm system with mesh topology.When one or more alarm device in the alarm system are destroyed,other alarms can immediately work,and upper PC can detect which alarm device is damaged.When any alarm in the burglar alarm system detects an intruder,all rest of the alarms will sounds.This paper use experiments to verify the effectiveness of this alarm system.In this paper,the anti-damage alarm system can also form a multi-layer network.This paper studies the self-organization method of multi-layer anti-theft alarm network.The mathematical formula of this self-organizing method is deduced and simulation researches about the systems are perfomed.When the burglar alarm nodes are placed irregularly,the protection areas of all burglar alarms automatically connect into an inclosed seamless loop,so that the intruder can not find any gap to access destination.When enough anti-theft nodes are placed,they will form some closed seamless loops so that multi-layer defense is constructed.Thus,even if the intruders destroyed one layer of burglar alarm network,however,they have to face next layer of burglar alarm network.Therefore the difficulty of invasion will certainly increase.In order that the burglar alarm system more accurately determine the location of the intruder,we study an improved algorithm for measuring arrival time(TOA).When a number of anti-theft alarms detect the intruder at the same time,three appropriate alarms are selected,and the specific coordinates of the intruder is calculated by trilateral intersecting method.The research results of the paper have the significance value for public security of our society,have the significance value for disaster prevention career.