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

Nishikawa, Ken‐Ichi; Higashino, Takeshi; Tsukamoto, Katsutoshi; Komaki, Shozo

doi:10.1109/pimrc.2009.5450156

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…But it is under the assumption of perfect time synchronization between Base Station (BS) and receiver, which is hardly implemented in practical uses. An additional BS is placed at the end of LCX to avoid the impact of imperfect time synchronization and high propagation loss of the reflected signal in [18]. The MUltiple-SIgnal-Classification (MUSIC)-based LCX positioning methods treat the frequency samples as the antenna array elements in conventional MUSIC.…”

Section: Introductionmentioning

confidence: 99%

New Signal and Algorithms for 5G/6G High Precision Train Positioning in Tunnel With Leaky Coaxial Cable

Yin,

Song,

et al. 2024

IEEE J. Select. Areas Commun.

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High precision train positioning is a crucial component of intelligent transportation systems. Tunnels are commonly encountered in subways and mountainous regions. As part of the communication system infrastructure, Leaky CoaXial (LCX) Cable is widely equipped as antenna in tunnels with many advantages. LCX positioning holds great promise as a technology for rail applications in the upcoming B5G (beyond-5G) and 6G eras. This paper focuses on the LCX positioning methodology and proposes two novel algorithms along with a novel communicationpositioning integration signal. Firstly, a novel algorithm called Multiple Slot Distinction (MSD) LCX positioning algorithm is proposed. The algorithm utilizes a generated pseudo spectrum to fully utilize the coupled signals radiated from different slots of LCX. This approach offers higher time resolution compared to traditional methods. To further improve the positioning accuracy to centimeter-level and increase the measuring frequency for fast trains, a novel communication-positioning integration signal is designed. It consists of traditional Positioning Reference Signal (PRS) and a significantly low power Fine Ranging Signal (FRS). FRS is configured to be continuous and superposed onto the cellular signal using Non-Orthogonal Multiple Access (NOMA) principle to minimize its interference to communication. A twostage LCX positioning method is then executed: At the first stage, the closest slot between the receiver and LCX is estimated by the proposed MSD algorithm using PRS; At the second stage, centimeter-level positioning is achieved by tracking the carrier phase of the continuous FRS. This process is assisted by the closest slot estimation, which helps mitigate interference between neighboring slots and eliminate the integer ambiguities. Simulation results show our proposed LCX position methodology outperforms the existing ones and offer great potentials for future implementations.

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Section: Introductionmentioning

confidence: 99%

New Signal and Algorithms for 5G/6G High Precision Train Positioning in Tunnel With Leaky Coaxial Cable

Yin,

Song,

et al. 2024

IEEE J. Select. Areas Commun.

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“…Reference [18] proposed a method for 1-D position detection with the TOA of the direct wave and the reflected wave from the end of LCX. Compared with 1-D location detection which only estimates the location information along the LCX, one improved method for 2-D localization method using TOA method from multiple LCXs has been researched in [19]. In addition to the TOA method, researches in [20] and [21] also developed a method using the time difference of arrival (TDOA) between the signal arrival at two ends of LCX to detect the location of the user.…”

Section: Introductionmentioning

confidence: 99%

Capacity Loss From Localization Error in MIMO Channel Using Leaky Coaxial Cable

et al. 2021

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Leaky coaxial (LCX) cable has been employed as antennas for wireless traffic over many linear-cell scenarios such as railway station, tunnels and shopping malls. In addition, LCX can be used for user localization and wireless power transfer (WPT). Compared with the equal power allocation method, the power allocation method for LCX system using positional information (PI) can improve its capacity with the same level of computational complexity. In this paper, we will investigate the level of capacity loss on the 2.4 GHz and 5 GHz band for the conventional equal power (EP) allocation method, the water-filling (WF) based power allocation, and our proposed low-complexity power allocation method for LCX system with PI. The results show that LCX system with our proposed method using PI can reduce the capacity loss due to localization error than that of others.

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“…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%

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

Cited by 9 publications

References 4 publications

New Signal and Algorithms for 5G/6G High Precision Train Positioning in Tunnel With Leaky Coaxial Cable

New Signal and Algorithms for 5G/6G High Precision Train Positioning in Tunnel With Leaky Coaxial Cable

Capacity Loss From Localization Error in MIMO Channel Using Leaky Coaxial Cable

Research on human intruder detection and localization based on LCX sensor

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