UWB Array-Based Sensor for Near-Field Imaging

Yarovoy, Alexander; Savelyev, T.G.; Aubry, Pascal; Lys, Pidio; Ligthart, L.P.

doi:10.1109/tmtt.2007.896791

Cited by 104 publications

(52 citation statements)

References 15 publications

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“…It suffices here to say that this decomposition can be carried out if the vertical component of the Poynting vector is known, which implies that the two horizontal components of the electric and magnetic field strengths are known. Electric field strengths are usually measured by GPR antennas, but also, small loop antennas can be used to measure the electromotive force that is directly related to the magnetic field [29], [30]. First, we assume that, in both states, the sources are outside D; this reduces (5) to…”

Section: Three-dimensional Radar Wave Interferometry In Dissipatmentioning

confidence: 99%

Interferometry by Deconvolution of Multicomponent Multioffset GPR Data

Slob

2009

IEEE Trans. Geosci. Remote Sensing

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Section: Three-dimensional Radar Wave Interferometry In Dissipatmentioning

confidence: 99%

Interferometry by Deconvolution of Multicomponent Multioffset GPR Data

Slob

2009

IEEE Trans. Geosci. Remote Sensing

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“…For array applications, antennas that are smaller than the open-ended waveguide must be used to achieve spacing less than a half wavelength. An array of time-domain sensors has been demonstrated using loop antennas [6]. The metal transmission line from the probe can perturb the very-near-field making the direct measurement approach less favorable than the indirect measurement approach [7].…”

Section: Introductionmentioning

confidence: 99%

Development of an Optically Modulated Scatterer Probe for a Near-Field Measurement System

Patrick¹,

Hutchinson²,

Boos³

2016

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Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std. Z39.18Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S ACRONYM(S) 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR / MONITOR'S REPORT NUMBER(S) Near-field measurement PhotodiodesIn high-fidelity, near-field measurements, the measurement probe must minimally impact the near-field of the antenna-under-test. To accomplish this, we developed an optically modulated, near-field probe which consists of a rectangular dipole antenna loaded with a photodiode. The modulation scheme separates scattering off of the probe from background reflections. We present the design and performance of an optically modulated scatterer (OMS) probe for use in a near-field measurement system.

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Section: Introductionmentioning

confidence: 99%

“…Such arrays have been developed for landmine detection and medical imaging [2]. A more advanced GPR system combines SAR in on-track direction with a cross-track linear array that receives the scattered field simultaneously with all antennas [3].A planar or conformal UWB array with the simultaneous signal reception would be the best solution in many applications. However its design encounters a serious contradiction between the antenna size, spacing in the array, and the level of sidelobes of the focused array, especially when high frequencies are used to achieve a high resolution.…”

mentioning

confidence: 99%

“…One possible solution to decrease the sidelobe level deals with enlarging the array aperture while simultaneously increasing the number of antennas in the array. This way makes the entire system including the electronics much more complex and increases the costs significantly.In this work we selected another solution that has been already tested successfully in the array-based GPR for landmine detection [3]. Combination of MIMO array focusing in the horizontal plane with SAR in the vertical plane represents a reasonable trade-off between the measurement speed and image quality.…”

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confidence: 99%

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Comparison of 10–18 GHz SAR and MIMO-based short-range imaging radars

Savelyev

Zhuge

Yang

et al. 2010

Int. J. Microw. Wireless Technol.

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This paper presents an experimental investigation of two approaches to short-range radar imaging at microwaves by means of ultra-wideband (UWB) technology. The first approach represents a classical synthetic aperture radar (SAR) that employs a transmit-receive antenna pair on mechanical scanner. The second one makes use of a multiple input multiple output (MIMO) antenna array that scans electronically in the horizontal plane and mechanically, installed on the scanner, in the vertical plane. The mechanical scanning in only one direction reduces significantly the measurement time. Two respective prototypes have been built and compared. Both systems comprise the same 10-18 GHz antennas and multi-channel video impulse electronics while the same data processing and imaging method based on Kirchhoff migration is applied to acquired data for digital beamforming. The study has been done for an application of concealed weapon detection.Keywords: Migration, Multiple input multiple output, Radar imaging, Synthetic aperture radar, Ultra-wideband array I . I N T R O D U C T I O NUltra-wideband (UWB) radar technology is being rapidly developed towards 3-D imaging radars that possess high down-and cross-range resolution. While the former comes from an UWB spectrum, the latter can be achieved by using either the synthetic aperture radar (SAR) or an antenna array, or their combination.The SAR approach employs 2-D mechanical scanning usually with one transmit (Tx) and one receive (Rx) antenna. The scattered electromagnetic field is being spatially sampled on a dense regular grid, which makes data acquisition too long. UWB SAR has been widely used in landmine detection by ground penetrating radar (GPR) [1].The use of antenna array significantly speeds up the data acquisition even in cases when the array consists of independent Tx-Rx pairs working sequentially. Such arrays have been developed for landmine detection and medical imaging [2]. A more advanced GPR system combines SAR in on-track direction with a cross-track linear array that receives the scattered field simultaneously with all antennas [3].A planar or conformal UWB array with the simultaneous signal reception would be the best solution in many applications. However its design encounters a serious contradiction between the antenna size, spacing in the array, and the level of sidelobes of the focused array, especially when high frequencies are used to achieve a high resolution. A sparse array with multiple Tx and multiple Rx antennas (i.e. multiple input multiple output (MIMO)) can be the optimal solution regarding the above factors plus complexity of the electronics. IRCTR investigated this direction for an application of concealed weapon detection and compared the quality of radar imaging by SAR and MIMO-based systems in the 3.1-10.6 GHz band [4]. A planar array with 4 Tx and 16 Rx antennas has been designed and evaluated. The array aperture was about 50 cm × 50 cm. In spite of quasi-real-time data acquisition and imaging, the performance of the array has been found i...

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UWB Array-Based Sensor for Near-Field Imaging

Cited by 104 publications

References 15 publications

Interferometry by Deconvolution of Multicomponent Multioffset GPR Data

Interferometry by Deconvolution of Multicomponent Multioffset GPR Data

Development of an Optically Modulated Scatterer Probe for a Near-Field Measurement System

Comparison of 10–18 GHz SAR and MIMO-based short-range imaging radars

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