A LCX-Based Intrusion-Detection Sensor Using a Broadband Noise Signal

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.