&lt;title&gt;Microwave hologram reconstruction for the RASCAN-type subsurface radar&lt;/title&gt;

Chapursky, V.V.; Ivashov, Sergey; Razevig, Vladimir; Sheyko, Anton P.; Vasilyev, I. A.

doi:10.1117/12.462280

Cited by 13 publications

(9 citation statements)

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“…In particular, a subset of the measurements presented in [7] has been used to evaluate the performances of the approach.…”

Section: Reconstruction Results From Experimental Datamentioning

confidence: 99%

“…The choice of the uniform aperture field is justified on the basis of the considerations made in [7] and by the fact that we are now considering as antenna an elementary source. Such an elementary source gives us the possibility to account more complicated sources since the formulation below will remain the same with the only exception that the radiated field is expressed under an integral form.…”

Section: Problem Formulationmentioning

confidence: 99%

“…Despite of the advantages offered by the hardware, one of the main limitations arising in the use of the holographic radar is the lack of an accurate modeling of the electromagnetic scattering, which is important to set-up inversion approaches able to retrieve the geometry of the targets (especially when the targets are not close to the measurement plane over which the radar system moves, -see [7] for more details on this issue).…”

Section: Introduction and Motivationsmentioning

confidence: 99%

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A Simple Processing Approach for Holographic Rascan Data

Soldovieri

Morabito²,

D’Agostino³

et al. 2010

PIER

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Abstract-This paper presents a reconstruction approach which exploits the field detected by a holographic radar in order to localize and geometrically qualify a set of scattering objects. In particular, thanks to the adoption of the Kirchhoff Approximation, the problem is formulated as a linear inverse one wherein the unknown function is the characteristic function accounting for the support (location and geometry) of the target(s). The reconstruction performances of the approach are investigated through an accurate numerical analysis, and an experimental validation is also performed with the aim of testing the effectiveness and the practical relevance of the proposed method.

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“…In particular, a subset of the measurements presented in [7] has been used to evaluate the performances of the approach.…”

Section: Reconstruction Results From Experimental Datamentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

Section: Introduction and Motivationsmentioning

confidence: 99%

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A Simple Processing Approach for Holographic Rascan Data

Soldovieri

Morabito²,

D’Agostino³

et al. 2010

PIER

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“…However, the coincident images can be post-processed and synthesized with specialized algorithms that improve the resolution or "focus" (Figures 8 & 9). It is anticipated that processing of the raw and focused microwave images will allow re-construction of the form of subsurface objects in a 3D rendering [7]. The holographic radar system is a portable device weighs less than 2 kg that can be carried in a briefcase for on-board inspection.…”

Section: Principle Of Holographic Radarmentioning

confidence: 99%

Evaluation of holographic subsurface radar for NDE of space shuttle thermal protection tiles

Snapp

Chao

et al. 2007

SPIE Proceedings

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Experiments have been carried out to evaluate holographic subsurface radar (RASCAN) for non-destructive evaluation (NDE) of subnominal bond conditions between the Space Shuttle Thermal Protection System tiles and the aluminum substrate. Initial results have shown detection of small voids and spots of moisture between Space Shuttle thermal protection tiles and underlying aluminum substrate. The characteristic feature of this device is the ability to obtain one-sided radar soundings/images with high sensitivity (detecting of wire of 20 micron and less in diameter), and high resolution (2 cm lateral resolution) in the frequency band of 3.6-4.0 GHz. JPL's advanced high-speed image processing and pattern recognition algorithms can be used to process the data generated by the holographic radar and automatically detect and measure the defects. Combining JPL's technologies with the briefcase size, portable RASCAN system will produce a simple and fully automated scanner capable of inspecting dielectric heat shielding materials or other spacecraft structures for cracks, voids, inclusions, delamination, debonding, etc.. We believe this technology holds promise to significantly enhance the safety of the Space Shuttle and the future CEV and other space exploration missions.

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“…Although more detailed experiments are needed to understand all of the capabilities of holographic radar for NDT of space vehicle heat protection systems, these initial experiments are extremely promising. In addition, it is shown that radio-frequency hologram reconstruction allows estimation of the depth of shallowly-buried objects and improves the lateral resolution of images with increasing target depths [6]. Furthermore, for even better resolution of the microwave images, the design of a holographic radar operating at a higher frequency (up to 20 to 30 GHz) is discussed.…”

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confidence: 99%

Comparison between Impulse and Holographic Subsurface Radar for NDT of Space Vehicle Structural Materials

Ivashov¹,

Vasiliev²,

Bechtel³

et al. 2007

PIERS Online

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Abstract-A subsurface holographic radar using a multi-frequency signal has been developed for inspecting dielectric construction materials. The characteristic feature of this device is the ability to obtain one-sided radar soundings/images with a high sensitivity and high resolution (2 cm) in the frequency band of 3.6-4.0 GHz. One promising application of the device is nondestructive evaluation of the heat protection system and other materials on the U.S. Space Shuttle, and proposed crewed exploration vehicle (CEV). The advantages of this continuouswave holographic radar over traditional impulse subsurface radars are discussed and illustrated by experimental results.The disastrous loss of the space shuttle Columbia, as well as even more recent dangerous incidents that were thankfully resolved, have aroused interest in possible new methods and devices for nondestructive testing and evaluation of the Space Shuttle Thermal Protection System, the external fuel tank insulating foam, and other materials and structures on the shuttle (see Figure 1), proposed CEV, and other space vehicles. Voids in or under the external tank insulating foam are considered potential sites for "cryopumping" where water seeps in and then evaporates explosively at altitude, pulling the foam from the tank (Figure 2).One of the possible means for non-destructive testing (NDT) and evaluation of structural materials is subsurface radar. This method is based on the propensity of electromagnetic waves to be reflected at permittivity contrasts. Up to now, the use of radar for NDT has been hindered by

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<title>Microwave hologram reconstruction for the RASCAN-type subsurface radar</title>

Cited by 13 publications

References 0 publications

A Simple Processing Approach for Holographic Rascan Data

A Simple Processing Approach for Holographic Rascan Data

Evaluation of holographic subsurface radar for NDE of space shuttle thermal protection tiles

Comparison between Impulse and Holographic Subsurface Radar for NDT of Space Vehicle Structural Materials

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