Microwave Holographic Imaging Using the Antenna Phaseless Radiation Pattern

Amineh, Reza K.; McCombe, Justin J.; Nikolova, Natalia K.

doi:10.1109/lawp.2012.2232275

Cited by 25 publications

(10 citation statements)

References 5 publications

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“…The majority of active illumination, coherent RF imaging systems are variants on either beam scanning or synthetic aperture radar (SAR). In SAR, field measurements are made over a large area, effectively synthesizing a large aperture [1][2][3][4][5][6][7][8][9][10][11][12][13][14]; alternatively, an aperture consisting of an array of sources can be used to create a focused beam that can then be scanned over an object. Phased arrays and active electronically scanned antennas are common examples of beam forming and scanning systems [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Frequency-diverse microwave imaging using planar Mills-Cross cavity apertures

et al. 2016

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We demonstrate a frequency diverse, multistatic microwave imaging system based on a set of transmit and receive, radiating, planar cavity apertures. The cavities consist of double-sided, copper-clad circuit boards, with a series of circular radiating irises patterned into the upper conducting plate. The iris arrangement is such that for any given transmitting and receiving aperture pair, a Mills-Cross pattern is formed from the overlapped patterns. The Mills-Cross distribution provides optimum coverage of the imaging scene in the spatial Fourier domain (k-space). The Mills-Cross configuration of the apertures produces measurement modes that are diverse and consistent with the computational imaging approach used for frequency-diverse apertures, yet significantly minimizes the redundancy of information received from the scene. We present a detailed analysis of the Mills-Cross aperture design, with numerical simulations that predict the performance of the apertures as part of an imaging system. Images reconstructed using fabricated apertures are presented, confirming the anticipated performance.

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Section: Introductionmentioning

confidence: 99%

Frequency-diverse microwave imaging using planar Mills-Cross cavity apertures

et al. 2016

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“…Because of this important capability, a considerable amount of research has been reported in the literature demonstrating the use of microwaves for various imaging applications, including medical imaging [1][2][3][4], through-wall imaging [5][6][7][8] and concealed ordnance imaging [9][10][11][12]. Most conventional imaging approaches employed in these applications can be understood as versions of synthetic aperture radar (SAR) [13] and microwave holographic imaging [14,15] techniques, both of which involve the use of a mechanically scanned transmitter to sequentially acquire scene data. Although promising results have been achieved using these known techniques, a remaining and significant challenge is the long imaging time required due to the mechanical movement of the antennas across the sampling points over the imaging scene.…”

Section: Introductionmentioning

confidence: 99%

Resolution of the Frequency Diverse Metamaterial Aperture Imager

Yurduseven¹,

Imani²,

Odabasi³

et al. 2015

PIER

108

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Abstract-The resolution of a frequency diverse compressive metamaterial aperture imager is investigated. The aperture consists of a parallel plate waveguide, in which an array of complementary, resonant metamaterial elements is patterned into one of the plates. Microwaves injected into the waveguide leak out through the resonant metamaterial elements, forming a spatially diverse waveform at the scene. As the frequency is scanned, the waveforms change, such that scene information can be encoded onto a set of frequency measurements. The compressive nature of the metamaterial imager enables image reconstruction from a significantly reduced number of measurements. We characterize the resolution of this complex aperture by studying the simulated point spread function (PSF) computed using different image reconstruction techniques. We compare the imaging performance of the system with that expected from synthetic aperture radar (SAR) limits.

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“…Hence, microwave imaging is of considerable interest for security screening, remote sensing, biomedical imaging and many other applications. A number of microwave imaging systems have been developed and fielded, including synthetic aperture radar (SAR) [1][2][3][4][5][6][7][8][9][10][11] and phased arrays [12][13][14][15][16]. While these techniques have demonstrated good image fidelity, limitations remain, particularly for fast, near real-time imaging.…”

Section: Introductionmentioning

confidence: 99%

Multistatic microwave imaging with arrays of planar cavities

Yurduseven

Gowda

Gollub

et al. 2016

IET Microwaves, Antennas & Propagation

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The authors present a multistatic imaging system at microwave frequencies based on arrays of planar cavity sub‐apertures, or panels. The cavity imager consists of sets of transmit and receive panels, loaded with radiating irises distributed over the sub‐apertures in an aperiodic pattern. This frequency‐diverse aperture produces distinct radiation patterns as a function of frequency that encode scene information onto a set of measurements; images are subsequently reconstructed using computational imaging approaches. Similar to previously reported computational imaging systems, the cavity‐based imager presents a simple system architecture, minimising the number and expense of components required in traditional microwave imaging systems. The cavity imager builds on previous frequency‐diverse approaches, such as the recently reported metamaterial and air‐filled cavity systems, by utilising frequency‐diverse panels for both the transmit and receive sub‐apertures of the imaging system. Though the panel‐to‐panel architecture has greater sensitivity to calibration error, this implementation nevertheless increases mode diversity and, in the context of a computational imaging system, results in improved image reconstructions.

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Microwave Holographic Imaging Using the Antenna Phaseless Radiation Pattern

Cited by 25 publications

References 5 publications

Frequency-diverse microwave imaging using planar Mills-Cross cavity apertures

Frequency-diverse microwave imaging using planar Mills-Cross cavity apertures

Resolution of the Frequency Diverse Metamaterial Aperture Imager

Multistatic microwave imaging with arrays of planar cavities

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