2-Dimensional Measuring Method Using a Wide-area Surveillance Sensor with Leaky Coaxial Cables

Abstract

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.

Two dimensional position detection method using bi-directional leaky coaxial cable based on TDOA

“…But this method cannot detect two-dimensional position of the intruder. A position detection method in [2] can detect two-dimensional position. But two kinds of RF-band and two LCXs are required.…”

A new position detection method using leaky coaxial cable

“…However, it is impossible to use GPS underground because GPS signal cannot be received due to obstacles. Therefore, many position detection methods to use at narrow area have been proposed [3,4,5]. A method in [3] is a method using wireless sensor nodes.…”

“…At the underground, the LCX(Leaky CoaXial cable) is considered as a preferable infrastructure, because LCX has already been constructed in the underground shopping center. Another position detection methods [4,5] use LCX. In [4], LCX performs as an intruder sensor by using two parallel LCXs are located.…”

“…Another position detection methods [4,5] use LCX. In [4], LCX performs as an intruder sensor by using two parallel LCXs are located. But it cannot detect two-dimensional position.…”