Research On Detection Of Perimeter Intruder Signal Based On Leaky Coaxial Cable

Perimeter intrusion detection is an important subject of security system.It plays an important role in the protection of important places in the open air.The detection system with leaky coaxial cable as sensors has attracted much attention due to its small environmental impact,good concealment and less damage.This paper designs and implements an on-line detection system based on synchronous detection.The system has the characteristics of modularity and parameter configurability,which can be applied to a variety of working conditions.At the same time,the system has the characteristics of network and it is convenient to form a flexible security network.It provides a feasible solution for perimeter intrusion detection.Firstly,the working principle of intrusion detection system based on leaky coaxial cable and the characteristics of leaky coaxial cable are analyzed,and the system scheme is designed according to the requirement of detection.To make the leaky coaxial cable can work in different conditions and purposes,this article uses DDS technology signal generator,which can bend configuration parameters according to the index of the transmitter.After the completion of the calculation of simulation,the hardware circuit is designed.According to software debugging and system testing,the transmitter can meet the requirements of the leaky coaxial cable.Secondly,this paper analyzes the methods of signal acquisition and information detection of leaky coaxial cable.On this basis,we study the signal processing technology such as synchronous detection,and design the signal receiver unit.The signal of the receiver unit is simulated by circuit and experimented for both intrusion and have not invaded.The intrusion detection signal is extracted and the real-time detection of human intrusion is realized.Thirdly,this paper analyzes the construction of security network based on leaky coaxial cable.In order to achieve the coordination of the deployment of multiple intrusion detection systems in different regions,this article designs a network based on CAN bus communication,ensures communication between a master station and a plurality of detector.Experimental results show that the transmitter unit can generate a configurable signal to meet the system requirements.The receiver unit can detect the intrusion signal accurately.The built-in security network can realize the remote transmission of the signal.