Accurate and Nonparametric Imaging Algorithm for Targets Buried in Dielectric Medium for UWB Radars

Akune, Ken; Kidera, Shouhei; Kirimoto, Tetsuo

doi:10.1587/transele.e95.c.1389

Cited by 22 publications

(25 citation statements)

References 9 publications

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“…In numerical simulations based on the FDTD method, our method reduced the relative errors in the relative permittivity estimation to less than 1%, even for the S/N = 30 dB data from an ellipsoidal dielectric medium. As a result, the internal image obtained employing the existing technique described in [8] provides a correct target shape even from noisy data.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, to obtain target points and normal vectors on the dielectric boundary with a sufficiently small interval, the Envelope interpolation described in [7] and [8] is also introduced. Both boundary points and normal vectors are necessary for the proposed permittivity estimation scheme, particular in estimating the propagation path inside the dielectric medium.…”

Section: Dielectric Boundary Extraction By Rpmmentioning

confidence: 99%

“…These results demonstrate that the waveform correction approach is considerably effective. Figure 5 shows the internal target boundary points estimated using the method described in [8] and using the estimated permittivity with the proposed method. This figure visually verifies that the part of the internal estimation image is correctly reconstructed by using the accurately estimated dielectric constant.…”

Section: Performance Evaluation Of Numerical Simulationmentioning

confidence: 99%

“…The actual time delay in propagating through the dielectric medium can then be accurately estimated from the recorded transmissive data. In particular, location and shape of an internal object are directly reconstructed by combining the exiting internal imaging method [8], which requires a correct dielectric constant for a surrounding dielectric object to accomplish highly accurate internal target reconstruction.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Accurate Permittivity Estimation Method for 3-Dimensional Dielectric Object with FDTD-Based Waveform Correction

Souma¹,

Kidera

Kirimoto

2014

IEICE Trans. Electron.

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Ultra-wideband pulse radar exhibits high range resolution, and excellent capability in penetrating dielectric media. With that, it has great potential as an innovative non-destructive inspection technique for objects such as human body or concrete walls. For suitability in such applications, we have already proposed an accurate permittivity estimation method for a 2-dimensional dielectric object of arbitrarily shape and clear boundary. In this method, the propagation path estimation inside the dielectric object is calculated, based on the geometrical optics (GO) approximation, where the dielectric boundary points and its normal vectors are directly reproduced by the range point migration (RPM) method. In addition, to compensate for the estimation error incurred using the GO approximation, a waveform compensation scheme employing the finite-difference time domain (FDTD) method was incorporated, where an initial guess of the relative permittivity and dielectric boundary are employed for data regeneration. This study introduces the 3-dimensional extension of the above permittivity estimation method, aimed at practical uses, where only the transmissive data are effectively extracted, based on quantitative criteria that considers the spatial relationship between antenna locations and the dielectric object position. Results from a numerical simulation verify that our proposed method accomplishes accurate permittivity estimations even for 3-dimensional dielectric medium of wavelength size.

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Section: Resultsmentioning

confidence: 99%

Section: Dielectric Boundary Extraction By Rpmmentioning

confidence: 99%

Section: Performance Evaluation Of Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Accurate Permittivity Estimation Method for 3-Dimensional Dielectric Object with FDTD-Based Waveform Correction

Souma¹,

Kidera

Kirimoto

2014

IEICE Trans. Electron.

Self Cite

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show abstract

“…To solve the above problems, we previously proposed an accurate, high-speed UWB imaging method for targets buried in dielectric media [3]. However, this method assumes that the dielectric constant is given, which is an idealized situation.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Constant and Boundary Extraction Method for Double-Layered Dielectric Object for UWB Radars

Niimi

Kidera

Kirimoto

2015

IEICE Trans. Electron.

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Microwave ultra-wideband (UWB) radar systems are advantageous for their high-range resolution and ability to penetrate dielectric objects. Internal imaging of dielectric objects by UWB radar is a promising nondestructive method of testing aging roads and bridges and a noninvasive technique for human body examination. For these applications, we have already developed an accurate internal imaging approach based on the range points migration (RPM) method, combined with a method that efficiently estimates the dielectric constant. Although this approach accurately extracts the internal boundary, it is applicable only to highly conductive targets immersed in homogeneous dielectric media. It is not suitable for multi-layered dielectric structures such as human tissues or concrete objects. To remedy this limitation, we here propose a novel dielectric constant and boundary extraction method for double-layered materials. This new approach, which simply extends the Envelope method to boundary extraction of the inner layer, is evaluated in finite difference time domain (FDTD)based simulations and laboratory experiments, assuming a double-layered concrete cylinder. These tests demonstrate that our proposed method accurately and simultaneously estimates the dielectric constants of both media and the layer boundaries.

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Application of microwave imaging in sensor-based ore sorting

Duan

Bobicki

Hum

2023

Minerals Engineering

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Accurate and Nonparametric Imaging Algorithm for Targets Buried in Dielectric Medium for UWB Radars

Cited by 22 publications

References 9 publications

Accurate Permittivity Estimation Method for 3-Dimensional Dielectric Object with FDTD-Based Waveform Correction

Accurate Permittivity Estimation Method for 3-Dimensional Dielectric Object with FDTD-Based Waveform Correction

Dielectric Constant and Boundary Extraction Method for Double-Layered Dielectric Object for UWB Radars

Application of microwave imaging in sensor-based ore sorting

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