Estimation of Echo Amplitude and Time Delay for OFDM-Based Ground-Penetrating Radar

Shi, Zheng; Pan, Xuehan; Zhang, Anxue; Jiang, Yansheng; Wang, Wenbing

doi:10.1109/lgrs.2015.2478279

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…Discerning the two closely adjacent rays is not straightforward in practice. Traditionally, properties of reflection rays are estimated through IFFT‐based algorithms from frequency domain measurements (Zheng et al, ). However, the resolution capability of the measurement is constrained by the measurement bandwidth

B

in IFFT‐based algorithms.…”

Section: Signal Model and Problem Statementmentioning

confidence: 99%

“…The proposed algorithms and analysis are validated on actual material samples. However, resolving closely adjacent arriving multipath components from measurement data is still challenging via inverse fast Fourier transform (IFFT) methodologies (Tewari et al, ; Yang et al, ; Zheng et al, ) due to their insufficient time domain resolution. In this paper, we propose a three‐step minimum least squares (MLS)‐based algorithm to resolve two adjacent rays reflected from the front and the back surfaces of a board‐shaped material.…”

Section: Introductionmentioning

confidence: 99%

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Two‐Ray Reflection Resolution Algorithm for Planar Material Electromagnetic Property Measurement at the Millimeter‐Wave Bands

et al. 2020

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Electromagnetic (EM) reflection properties of building materials and structures have been investigated through practical measurements. However, the finite thickness of measured materials makes it challenging to resolve the rays reflected from the front and the back surfaces. In this paper, we therefore present a three‐step minimum least squares‐based algorithm to resolve two closely adjacent rays reflected from the front and the back surfaces of a board‐shaped material. Our analytical and numerical results show that the proposed algorithm achieves the Cramér‐Rao lower bound. The proposed algorithm is validated using measurement data for various materials and incident angles in the 40–50 GHz frequency band. The validation results show that the proposed algorithm is capable of resolving two closely adjacent rays with a root‐mean‐square deviation that is smaller than 0.08. Main applications of the proposed algorithm can be found in the frequency domain measurements of the EM wave reflections by typical building structures, e.g., window glass, doors, ceiling, and floors.

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B

in IFFT‐based algorithms.…”

Section: Signal Model and Problem Statementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two‐Ray Reflection Resolution Algorithm for Planar Material Electromagnetic Property Measurement at the Millimeter‐Wave Bands

et al. 2020

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“…One of the UWB-based techniques is using an impulse radar [6–8]. The applications utilizing the impulse radar technique can be included near zone sensing radars, such as ground-penetrating radar [9–11], medical imaging [12–15], through-the-wall penetrating radar [16, 17], etc.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the effects of resistive loading on wrapped bow-tie antennas

Lee

Shaker

Melek

2019

Int. J. Microw. Wireless Technol.

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The pulse radiating characteristic of a wrapped bow-tie antenna (WBA) and wrapped resistively loaded bow-tie antenna (WRLBA) is presented for impulse radar applications in this paper. The numerical analysis of the WRLBA is performed by comparing that of the WBA. The wrapped antennas are realized on a flexible substrate. The antennas are fed by an impedance tapered balun, which has an overall transmission loss of −1.4 dB over the balun length. The characteristics of the resistive loading to the wrapped antenna, such as reflection coefficient, reflected pulse in the time domain, voltage standing wave ratio, and input impedance, are experimentally investigated and compared with simulated results. The fidelity factor of the radiated electric field on the boresight direction for the WBA and WRLBA is calculated as 0.82 and 0.96, respectively. The wireless communication ability is evaluated by the transmission coefficient, group delay, boresight gain, and received waveform. The calculated fidelity factor of the received waveform for the WBA and WRLBA is 0.79 and 0.85, respectively. The average and variations of the group delay of both wrapped antennas are observed to be around 2.5 ns and less than 1.5 ns, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In this regard, the impulse radar characterized by UWB pulse has widely utilized for near zone sensing applications. The applications in the vicinity of the targets can be included for not only medical applications, such as imaging of the breast tumor, [2][3][4][5] imaging of the bleeding area for stroke, [6][7][8] and assessment of bone mineral density, [9][10][11] but also industrial applications such as ground-penetrating radar (GPR), [12][13][14][15] through-wall penetrating radar, 16,17 and foliage-penetrating radar (FPR). 18,19 For near zone sensing applications, the proposed antenna should radiate a short pulse with less distorted waveform to receive a clear echo pulse reflected by the target.…”

Section: Introductionmentioning

confidence: 99%

Wrapped ultra‐wide band radar sensor based on resistively loaded bow‐tie antenna for near zone sensing applications

Lee

Melek

Shaker

2018

Micro & Optical Tech Letters

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This article presents the pulse radiating and imaging performances of a wrapped resistively loaded bow‐tie antenna (WRLBA) which has a reduced aperture size for utilizing near zone sensing applications. The pulse radiating performances of the WRLBA are investigated and evaluated by comparing to those of the nonloaded wrapped bow‐tie antenna (WBA). The calculated fidelity factor and evaluation factor (EF) of the WRLBA on the boresight direction are 0.97 and 0.07, respectively. The monostatic radar experiment has been shown that two copper targets with a radius of 2 cm are reconstructed at 15 and 20 cm, respectively. Based on the evaluation of the pulse radiating performances and imaging experiment, the proposed WRLBA is a suitable candidate for imaging applications in the vicinity of the targets.

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Estimation of Echo Amplitude and Time Delay for OFDM-Based Ground-Penetrating Radar

Cited by 8 publications

References 16 publications

Two‐Ray Reflection Resolution Algorithm for Planar Material Electromagnetic Property Measurement at the Millimeter‐Wave Bands

Two‐Ray Reflection Resolution Algorithm for Planar Material Electromagnetic Property Measurement at the Millimeter‐Wave Bands

Investigation on the effects of resistive loading on wrapped bow-tie antennas

Wrapped ultra‐wide band radar sensor based on resistively loaded bow‐tie antenna for near zone sensing applications

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