This paper considers parameter estimation of a hybrid sinusoidal frequency modulated (FM) and polynomial phase signal (PPS) from a finite number of samples. We first show limitations of an existing method, the high-order ambiguity function (HAF), and then propose a new method by adopting the high-order phase function which was originally designed for the pure PPS. The proposed method estimates parameters of interest from peak locations in the time-frequency rate domain, which are less perturbed by the noise than peak values used by the HAF-based method. Numerical evaluation shows the proposed method can handle the hybrid FM-PPS signal with low sinusoidal frequency and improve estimation accuracy in terms of mean squared error for several orders of magnitude
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.
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.
Novel leaky coaxial cable (LCX) is developed. It contains both transmitting and receiving LCX for intrusion detection sensor. While the suppression of coupling between transmitter and receiver is major theme in microwave technology, we give a solution of transmitter and receiver antenna combination. We have developed a prototype of 2 in 1 LCX and then evaluated its performance for intrusion detection sensor in field experimentation.
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