2 in 1 leakey coaxial cable for intrusion detection sensor

Inomata, Kenji; Tsujita, Wataru; Hirai, Takashi

doi:10.1109/sas.2013.6493560

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…The parameters of the LCX sensor are defined as follows: the dielectric constant of the insulation medium is 1.247, dielectric loss angle tangent is 1.7e-5 and the pitch is 1 m. According to the classification method of LCX's working modes theory, 12 the LCX is in the radiation mode when the frequency is higher than 142 MHz, or the LCX is in the coupling mode when the frequency is lower than 142 MHz. Figure 3 shows the human intruder model and the propagation characteristics of electric field (E-field) when the frequency is 100 MHz.…”

Section: Analysis On the Mechanism Of The Field Disturbance Caused mentioning

confidence: 99%

“…In fact, most research is using IQ-demodulated method for obtaining the phase information of the echo signal. [10][11][12] However, instead of the phase, more attention is paid to the amplitude of the synchronous subtraction for locating the intruder in this article. On the basis of the amplitude stability of the V IQ , the effects of the intruder positioning are evaluated at 40, 100, and 200 MHz separately according to the time delay, and the method of improving the positioning error is further studied.…”

Section: Introductionmentioning

confidence: 99%

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Research on human intruder detection and localization based on LCX sensor

Qiao

Lü

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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Many aspects of the intruder detection system (IDS) based on the LCX sensor are still unknown due to its complex propagation characteristics. In order to study the field disturbance mechanism of human intruder and to reduce the phase error caused by the initial state of the detection signal, a novel method of improving the localization accuracy is proposed. At the frequencies of 40, 100, and 200 MHz, the IDS based on the LCX sensor is proposed by analyzing the scattering characteristics of the radar cross section (RCS) of human intruder and using IQ demodulation method. According to the characteristics of the IDS, the RCS is obtained by irradiating the human intruder from three typical radiation directions, which are front, side, and low-side direction in the mentioned frequency range. Combined with the method of pulse accumulation and synchronous subtraction, the intruder localization can be easily realized by using pulse delay positioning method. The results demonstrate the improvement in localization accuracy and the decrement in false positive rate, and the positioning error is less than 1 m.intruder detection, LCX sensor, localization, pulse accumulation, synchronous subtraction, phase errorAs a kind of receiving and emitting device, leaky coaxial cable (LCX) has been intensively used for various application scenarios, such as tunnel, railway, indoor communication, and positioning localization system. 1-5 The perimeter intrusion detection system (IDS) based on the LCX sensor has been widely studied because of its better concealment, flexible installation, and all-weather conditions work. 6,7 The ordinary localization systems usually detect the target in the area of directional beam of the systems' antennas.However, the IDS based on LCX sensor has completely different characteristics. The apertures on the LCX are similar to the array antennas, 8,9 which builds a wide-belt flexible detection area instead of the area of directional beam. The closer the distance between the aperture and the intruder, the more obvious reflection effect the aperture provides. The IDS can avoid the influence of the environment and the terrain. Because most of the power is transmitted in the LCX sensor, the IDS can reach a far distance to achieve the security guarding with the small attenuation in a specific area.Although some IDS based on LCX sensor have been applied, on the one hand, there are few articles discussing the theoretical analysis or mathematical calculation of the electromagnetic disturbance mechanism of the human intruders; on the other hand, with the development of science and technology, there is an urgent need to deal with the IQ-demodulation echo signal with the new method. Based on the results of radar cross section (RCS) calculations, the disturbing mechanism of human intruder is analyzed in this article. The experiments in time-domain and frequency-domain echo signals are carried out in the radiation mode and coupling mode. Moreover, the experiment of the signal receiver unit of IDS is conducted by means of the...

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Section: Analysis On the Mechanism Of The Field Disturbance Caused mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on human intruder detection and localization based on LCX sensor

Qiao

Lü

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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show abstract

“…The intrusion detection system (IDS) using LCX sensor has many advantages, LCX sensor can be hidden under the ground easily without changing the appearance of the environment, it is also an all‐weather sensor for IDS. Intruder detection system based on LCX sensor can achieve the location and detection by observing the disturbance of electromagnetic field when intruder steps in the warning area …”

Section: Introductionmentioning

confidence: 99%

“…Intruder detection system based on LCX sensor can achieve the location and detection by observing the disturbance of electromagnetic field when intruder steps in the warning area. 10,11 However, on one hand, few studies have been done on the evaluation of LCX for detection systems comprehensively, further studies are still necessary to evaluate the coupling loss of LCX, we propose a method to analysis the coupling loss of LCX in rotary, horizontal, vertical and radial, respectively. It is hoped that the question will be resolved with the proposed method.…”

Section: Introductionmentioning

confidence: 99%

A novel sensor using VHF zigzag‐slotted leaky coaxial cable for intruder localization

Qiao

Chen

2018

Micro & Optical Tech Letters

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The sensors used in the field of traditional security warfare are often constrained by environmental factors such as weather, light and terrain. In order to solve this problem, a new perimeter intrusion detection system sensor is urgently needed. Based on the theory of the array antenna, leaky coaxial cable (LCX) with periodic zigzag‐slotted outer conductor is designed, its coupling loss is simulated by the software Ansoft HFSS. For evaluating the coupling loss of the LCX comprehensively, the LCX is simulated and measured in four directions, the measured results of coupling loss are 64.1 dB, 62.6 dB, 64.3 dB, 57.2 dB in rotary, horizontal, vertical, and radial direction, respectively. With the research on LCX wireless sensing techniques, a novel LCX sensor is designed and a new approach of localization is put forward. When the intruder enters into the surveillance, the proposed LCX sensor can achieve to detect and locate the intruder by emitting the LFM pulse signal whose working frequency is in VHF, pulse compression is used to improve the detection performance of the intrusion detection system (IDS). The positioning accuracy of the IDS is within 0.8 m, and the range distance is 6.64 m.

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