Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

Computational imaging using coded apertures offers all-electronic operation with a substantially reduced hardware complexity for data acquisition. At the core of this technique is the single-pixel coded aperture modality, which produces spatio-temporarily varying, quasi-random bases to encode the ba...

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Bibliographic Details
Published inRemote sensing (Basel, Switzerland) Vol. 12; no. 9; p. 1531
Main Authors Yurduseven, Okan, Abbasi, Muhammad Ali Babar, Fromenteze, Thomas, Fusco, Vincent
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2020
MDPI
Subjects
Antennas
Aperture
Apertures
Computer applications
Conditioning
Data acquisition
Electric fields
Electromagnetism
Engineering Sciences
frequency-diversity
Image reconstruction
imaging
Imaging radar
Imaging techniques
Inverse problems
lens
Lenses
metasurface
Microwave imaging
microwaves
Noise
Orthogonality
Physics
Pixels
Radar
Radar data
Radar imaging
Raster scanning
Signal and Image processing
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Summary:Computational imaging using coded apertures offers all-electronic operation with a substantially reduced hardware complexity for data acquisition. At the core of this technique is the single-pixel coded aperture modality, which produces spatio-temporarily varying, quasi-random bases to encode the back-scattered radar data replacing the conventional pixel-by-pixel raster scanning requirement of conventional imaging techniques. For a frequency-diverse computational imaging radar, the coded aperture is of significant importance, governing key imaging metrics such as the orthogonality of the information encoded from the scene as the frequency is swept, and hence the conditioning of the imaging problem, directly impacting the fidelity of the reconstructed images. In this paper, we present dielectric lens loading of coded apertures as an effective way to increase the information coding capacity of frequency-diverse antennas for computational imaging problems. We show that by lens loading the coded aperture for the presented imaging problem, the number of effective measurement modes can be increased by 32% while the conditioning of the imaging problem is improved by a factor of greater than two times.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs12091531