Abstract
An intrusion detection sensor system based on a broadband noise signal and two leaky coaxial cables (LCXs) is proposed and experimentally demonstrated. In the proposed sensor, the broadband noise signal is generated by our designed white noise generator used as the detection signal. The detection signal is transmitted and received by two parallel LCXs, forming an invisible electromagnetic monitoring field around the protected area. The intrusion distance along the LCXs can be accurately extracted by the correlation method and the difference between pre- and post-intrusion correlation curves. Experimental results demonstrate the proposed sensor can monitor the intrusion process and locate multiple intruders. The range resolution of 30 cm and the dynamic range of 30 dB can be achieved. Furthermore, the proposed sensor has the strong anti-radio frequency interference (anti-RFI) capability, which makes it very suitable in the complex RF environment.
Highlights
Intrusion detection technologies have been widely used in safety protection of critical infrastructures such as banks, airports, nuclear power plants, military bases and other sensitive sites which require a very high level of security
By calculating the difference between pre- and post-intrusion correlation curves, an obvious correlation peak at 4.0 m is obtained as shown in Fig.5(c), whose peak position indicates the intrusion distance from the initiating terminal along the leaky coaxial cables (LCXs)
As the results indicate that the LCXbased sensor using the noise as the detection signal has good immunity against external radio frequency interferences (RFIs), which makes it very suitable in the complex radio frequency (RF) environment
Summary
Intrusion detection technologies have been widely used in safety protection of critical infrastructures such as banks, airports, nuclear power plants, military bases and other sensitive sites which require a very high level of security. Common intrusion detection technologies include laser scanners [1], [2], infrared sensors [3], [4], video mobile detectors (VMDs) [5], [6] and electronic fences [7], [8]. These technologies have the following defects: (1) Detection equipments such as electronic fences are usually exposed to the outside and vulnerable to intentional evasion and malicious destruction, so they have poor concealments. Compared with common intrusion detection technologies, the LCX-based sensor has the following inherent advantages [12]: (1) The LCXs are buried in the shallow underground layer and the monitoring electromagnetic field is invisible, which makes the sensor more concealed. (2) The monitoring electromagnetic field between two LCXs is not affected by temperature, visibility and weather variations. (3) The LCXs have good flexibilities and can be laid around the protected area according to the terrain characteristics without blind area
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