An ultrawide-band microwave radar sensor for nondestructive evaluation of pavement subsurface

Park, Joongsuk; Nguyen, Cam

doi:10.1109/jsen.2005.851002

Cited by 33 publications

(2 citation statements)

References 8 publications

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“…Demands for emergent monitoring of aging roads, tunnels, bridges, or other transportation infrastructures are increasing, and a speedy and accurate nondestructive testing (NDT) technique is strongly required for anomaly detection, such as corrosion of reinforced rod, water leakage into air crack, or chloride ingress. One of the promising solutions for the above application is microwave-based nondestructive evaluation (MWNDE) radar, which retains sufficient penetration depth (exceeding 500 mm) and high-depth resolutions while significantly reducing labor costs and time for large-scale inspection [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Complex Permittivity Retrieval Approach With Radar Enhanced Contrast Source Inversion for Microwave Nondestructive Road Evaluation

Suzuki,

Nakamura,

Kidera

2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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An experimental investigation of microwave quantitative imaging of nondestructive testing applications for concrete road structures is presented. A radar prior-based contrast source inversion (CSI) scheme is introduced to achieve an accurate reconstruction for target shape and dielectric property by applying the promising radar approach-range points migration (RPM). Moreover, to address the local optimum problem, we introduce an appropriate initial estimate for complex permittivity that focuses on the cost function of the CSI. A numerical and real data from an actual concrete road model, where a thin-layer water-filled cavity is buried into the boundary area between the asphalt and the concrete floorboard, show that our proposed approach improves reconstruction accuracy for permittivity and conductivity in a real nondestructive testing model.

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Section: Introductionmentioning

confidence: 99%

Complex Permittivity Retrieval Approach With Radar Enhanced Contrast Source Inversion for Microwave Nondestructive Road Evaluation

Suzuki,

Nakamura,

Kidera

2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…Dual-polarisation antennas with high port-to-port isolation have wide applications in contemporary radiocommunication systems in order to increase their performance in variable propagation conditions. In case of microwave radar sensors, the sensitivity strongly depends on isolation between the RX input and TX output [1][2][3]. In 2 × 2 MIMO systems, the throughput could be doubled by means of simultaneous emission using two orthogonal polarisations [4].…”

Section: Introductionmentioning

confidence: 99%

On the Design of Dual-Polarised Linear Antenna Arrays with Enhanced Port-to-Port Isolation

Wójcik

Surma

Нога

et al. 2020

Sensors

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The paper describes the process of designing a dual-polarised linear antenna array with enhanced port-to-port isolation, with the example of a four-element array with isolation better than 60 dB for the U-NII 5.15–5.925 GHz band. As a single antenna, dual-polarised electromagnetically coupled microstrip antennas were used with port-to-port isolation not exceeding 25 dB. A significant improvement in the isolation of the array was achieved thanks to the application of a dedicated feeding network. On the basis of theoretical analysis, a mathematical model describing port-to-port isolation was developed. Circuit and full-wave simulations were carried out to show the influence of electromagnetic couplings between antennas and/or the microstrip lines of the feeding network and the selection of phase shifters/power dividers on the isolation. The fabricated prototype is characterised by a gain of about 14 dBi, polarisation purity of at least −27 dB within the main lobe and close to expectations isolation better than 57 dB within the whole operational band.

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Applications of Microwave Imaging

Pastorino¹

2010

Microwave Imaging

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An ultrawide-band microwave radar sensor for nondestructive evaluation of pavement subsurface

Cited by 33 publications

References 8 publications

Complex Permittivity Retrieval Approach With Radar Enhanced Contrast Source Inversion for Microwave Nondestructive Road Evaluation

Complex Permittivity Retrieval Approach With Radar Enhanced Contrast Source Inversion for Microwave Nondestructive Road Evaluation

On the Design of Dual-Polarised Linear Antenna Arrays with Enhanced Port-to-Port Isolation

Applications of Microwave Imaging

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