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This paper presents a pattern analysis technique for human intrusion detection with a pair of Leaky Coaxial Cables (LCX). The LCXs are placed on the ground along the border of the site. When an object crosses the LCXs, the microwave radiated from the transmitting LCX is fluctuated. The sensor unit connecting the receiving LCX catches the fluctuating signals, then pattern analysis using the in-phase and the quadrature phase (I/Q) signals is utilized to recognize human intrusion. Our new approach uses two types of signals emitted from the LCXs, the radiation mode signal and the surface mode signal. Two types of I/Q patterns are obtained simultaneously.This double pattern analysis successfully reduces many of the false alarms compared with former approaches.Index Terms -leaky coaxial cable, LCX, intrusion detection, microwave, pattern analysis.

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This paper presents a new design and achievement of Leaky Coaxial Cable (LCX)-based intrusion-sensing techniques. LCX radiates microwaves from slots milled on the outer conductor. This sensor can detect an intrusion object by measuring the variation of received signal. LCX has two types of emitting modes, radiation mode and surface mode. The microwave radiates to far field in radiation mode. On the other hand, the microwave exists only around the LCX in surface mode. Although the conventional LCX-based sensor operates the LCX in only one mode to detect and classify an object, this paper introduces a simultaneous sensing technique using these two modes. Comparing the signals in both modes, the classification of an object can be estimated. The theory of the emitting modes of LCX and the developed sensor prototype are described. Experimental results are presented to show that the proposed sensing techniques are valid.

We have developed a wide-area surveillance sensor with a pair of lealky coaxial cables (LCX). It detects targets in the surveillance area by scattering signals generated by targets whose positions are measured using propagation delay time. Such a sensor has been studied previously; however, several problems remain. The primary issue is two-dimensional sensing which in practice is desired to improve the accuracy of the boundary line of the surveillance area.In this paper, we present a fundamental beam-forming technique for LCXs and a method for measuring 2diemensional target position using a multi-frequency measurement technique.