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Electronics, 2019 For a three-dimensional wide-angle synthetic aperture radar (SAR) with non-uniform sampling, it is necessary to divide its large aperture into several small sub-apertures before imaging due to the anisotropic characteristics of the target.
Shiqi Xing, Yongzhen Li
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Pupil Masking and Rotated Sub-apertures
Imaging and Applied Optics Congress 2022 (3D, AOA, COSI, ISA, pcAOP), 2022We optimised the shapes of the sub-apertures both in aperture masking and for segmented telescopes, by improving their MTF, and allowing for easier alignment. With ellipses or ovoids, our lab model also showed better convergence.
Erez N. Ribak, B. M. Levine
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Calibration of the sub-aperture backscatter system on OMEGA EP
Review of Scientific Instruments, 2023The sub-aperture backscatter (SABS) diagnostic on the OMEGA EP Laser System [Waxer et al., Opt. Photonics News 16, 30 (2005)] is a diagnostic that is used to measure the backscattered and sidescattered light during laser–plasma interaction experiments [W. L. Kruer, The Physics of Laser Plasma Interactions, Frontiers in Physics Vol.
T. Filkins +4 more
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Ultrasound probe sub-aperture processing
The Journal of the Acoustical Society of America, 2009A sub-aperture transceiver system for an ultrasound probe includes a signal processor, receive signal connections connecting the signal processor to a receive aperture comprising acoustic transceiver elements, and transmit signal connections coupled to a transmit aperture that includes at least one acoustic transceiver element multiplexed with the ...
HAUGEN GEIR ULTVEIT +2 more
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On plenoptic sub-aperture view recovery
2016 24th European Signal Processing Conference (EUSIPCO), 2016Light field imaging is recently made available to the mass market by Lytro and Raytrix commercial cameras. Thanks to a grid of microlenses put in front of the sensor, a plenoptic camera simultaneously captures several images of the scene under different viewing angles, providing an enormous advantage for post-capture applications, e.g., depth ...
Mozhdeh Seifi +3 more
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Coherent Sub-Aperture Ultraviolet Imagery
SPIE Proceedings, 1989ABSTRACT Laboratory targets have been imaged by a multi- sub -aperture, coherent receiver technique in which a common local oscillator illuminates the sub -aperture array to preserve both phase and intensityinformation. The target, receiver and range dimensions were chosen such that each sub -aperture was smaller than the speckle size.
R. G. Morton +5 more
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Recent advances in sub-aperture finishing
SPIE Proceedings, 2005Subaperture polishing technologies have radically changed the landscape of precision optics manufacturing and enabled the production of components with higher accuracies and increasingly difficult figure requirements. Magnetorheological Finishing (MRF), for example, is a production-proven, deterministic, subaperture finishing technology that has ...
Marc Tricard, Aric Shorey, Paul Dumas
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A Sub-aperture Division Method for FMCW CSAR Imaging
2020Frequency modulation continuation wave circular synthetic aperture radar (FMCW CSAR) imaging can’t focus imaging,because of the target scattering coefficient to change caused by large synthetic aperture. The sub-aperture imaging algorithm effectively avoids such problems.
Depeng Song +4 more
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Plenoptic Camera Calibration Based on Sub-Aperture Images
2019 IEEE International Conference on Image Processing (ICIP), 2019Accurate and robust calibration methods for plenoptic cameras are necessary due to their increasing popularity as depth estimation devices. Existing calibration methods can be placed in two categories: microlens based and sub-aperture image based. The low pixel-count in the microlenses is a limitation for microlens-based methods.
Walid Darwish +2 more
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