Zobrazeno 1 - 10
of 25
pro vyhledávání: '"B. Braker"'
Publikováno v:
Sustainable Development and Social Responsibility—Volume 1 ISBN: 9783030329211
A walk through Downtown Cairo is a unique experience any urban planner and architect would appreciate. It is a district from the 19th century that was dramatically transformed from an elite neighbourhood into a chaotic district overrun by street vend
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c39d2d6698ad70a16cbc89e9b914e924
https://doi.org/10.1007/978-3-030-32922-8_13
https://doi.org/10.1007/978-3-030-32922-8_13
Publikováno v:
IEEE Journal of Selected Topics in Quantum Electronics. 14:952-962
We describe and demonstrate a Fourier-optical beamformer that modulates RF energy from an antenna array onto a corresponding array of coherent optical beams and forms RF-frequency-scaled (or beam-squinted), far-field images through a single-lens opti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c26fd1dd8270d974745ed6a68dd595ed
https://doi.org/10.1109/jstqe.2008.918657
https://doi.org/10.1109/jstqe.2008.918657
Autor:
Kelvin H. Wagner, B. Braker
Publikováno v:
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM.
We present an experimental demo of a wideband Fourier optical beamformer that compensates for beam squint using spectrally selective imaging in a spectral hole burning crystal and corrects for phase errors using optical self calibration.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::56f746274e6d97f5be1eb42223aec9c6
https://doi.org/10.1364/cosi.2007.ctub7
https://doi.org/10.1364/cosi.2007.ctub7
Publikováno v:
Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006..
In this paper, we present an electro-optic radar receiver for wide bandwidth, high time-bandwidth-product radar returns that simultaneously performs parallel beamforming across arrays with thousands of antenna elements. This analog technique allows f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dab639acb84c9f5c7b6b19f92600aabc
https://doi.org/10.1109/sam.2006.1706204
https://doi.org/10.1109/sam.2006.1706204
Publikováno v:
Fourth IEEE Workshop on Sensor Array and Multichannel Processing, 2006..
RF imaging is the mapping of signal intensity to the available azimuth and elevation angles of arrival. Although the result is analogous to optical images, which are formed using optical lenses, RF imagers typically use processor-intensive synthesis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::858fbde203d128de3d3efd8f8f5d59c1
https://doi.org/10.1109/sam.2006.1706201
https://doi.org/10.1109/sam.2006.1706201
Publikováno v:
Optical Amplifiers and Their Applications/Coherent Optical Technologies and Applications.
Coherent optical systems can be fed by phase cohered fiber arrays that maintain constant phase across the array. We present and compare results for arrays cohered by holography, redundant spacing calibration, and optical self-calibration.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bf20655c16709ca7cf765bb3cf5fb20
https://doi.org/10.1364/cota.2006.cthd2
https://doi.org/10.1364/cota.2006.cthd2
Autor:
Donghua Gu, Sandrine I. Herriot, Kelvin H. Wagner, Youzhi Li, B. Braker, Robert T. Weverka, Lu Gao
Publikováno v:
Digest of the LEOS Summer Topical Meetings, 2005..
Two broadband, sparse array multiple beamforming optical processors are presented. These systems enable squint-free, true-time delay beamforming of large, randomly-spaced antenna arrays by compensating the frequency-dependent scale factor of the RF i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d72528ecf7ff749273a7817e58ea7bb
https://doi.org/10.1109/leosst.2005.1528039
https://doi.org/10.1109/leosst.2005.1528039
Publikováno v:
SPIE Proceedings.
We present an optical approach to 1-D broadband microwave imaging. The imager uses a Fourier optical beamformer to generate a squinted broadband image which is then spectrally resolved by burning a spatial distribution (an image) of spectral signals
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::617ba728c7c950ed363dde5faa686b35
https://doi.org/10.1117/12.604146
https://doi.org/10.1117/12.604146
Publikováno v:
Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM.
We present broadband microwave imaging that uses Fourier optical beamforming to project squinted broadband images into a spectral hole burning material from which independent narrowband images are read, de-squinted, and summed into broadband microwav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d3d214e3a1119d1aa8b6d3823723f0a3
https://doi.org/10.1364/ip.2005.itua3
https://doi.org/10.1364/ip.2005.itua3
Publikováno v:
SPIE Proceedings.
We present a proof-of-concept optical experiment that demonstrates the ability to record squinted broadband RF images formed by a Fourier beamforming phased-array antenna and subsequent squint correction using spatial spectral holography. A cryogenic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d83fc5775f1576f44d6a8e9f80d072c4
https://doi.org/10.1117/12.559689
https://doi.org/10.1117/12.559689