Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Stephen M. Sekelsky"'
Publikováno v:
IET Microwaves, Antennas & Propagation. 14:1476-1480
An ultra-wideband (UWB) array is presented for UHF-S band (0.19–2.3 GHz) communications with an emphasis on dual-linear polarisation and wide-angle scanning. The array achieves 12:1 impedance bandwidth for a voltage standing wave ratio (VSWR)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c68a4fc416faa88f34bd9d510481669d
https://doi.org/10.1049/iet-map.2019.0674
https://doi.org/10.1049/iet-map.2019.0674
Autor:
John L. Volakis, Han Liu, Elias A. Alwan, Gregory Mitchell, Alexander D. Johnson, Steven J. Weiss, Stephen M. Sekelsky, David Turowski
Publikováno v:
2019 IEEE International Symposium on Phased Array System & Technology (PAST).
This paper presents the design and measured results for an ultra-wideband aperture with excellent gain-bandwidth-scanning performance across a 190–2300 MHz bandwidth. The aperture uses a meta-material frequency selective surface to achieve $+/-$ 60
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::070c50aeda0126f8fb4f936c181ab651
https://doi.org/10.1109/past43306.2019.9020940
https://doi.org/10.1109/past43306.2019.9020940
Publikováno v:
Journal of Applied Meteorology. 41:473-487
In this study the radiative impact of three separate cirrus anvil systems that occurred during the Maritime Continent Thunderstorm Experiment is investigated. Retrievals of microphysical cloud properties and an independent radar measurement are used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8551f0219d467e54318a57fb76ecd734
https://doi.org/10.1175/1520-0450(2002)041<0473:rioacd>2.0.co
https://doi.org/10.1175/1520-0450(2002)041<0473:rioacd>2.0.co
Autor:
Stephen M. Sekelsky
Publikováno v:
Journal of Atmospheric and Oceanic Technology. 19:468-477
Millimeter-wavelength (MMW) cloud radars operating at Ka band (35 GHz) and W band (95 GHz) are popular atmospheric research tools because they are compact, have low prime power requirements, and are highly sensitive to small hydrometeors. In order to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f6a907ea8f24841155093e4003949c38
https://doi.org/10.1175/1520-0426(2002)019<0468:nfraab>2.0.co
https://doi.org/10.1175/1520-0426(2002)019<0468:nfraab>2.0.co
Publikováno v:
Journal of Atmospheric and Oceanic Technology. 19:478-485
Dual-antenna radar designs avoid using a transmit/receive switch. In order to measure radar reflectivity accurately and to avoid a general decrease in system sensitivity, these systems require precise alignment of their high-gain/narrow-beamwidth ant
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1746baf050fae2d9ceecea7f74ccaa98
https://doi.org/10.1175/1520-0426(2002)019<0478:peacfd>2.0.co
https://doi.org/10.1175/1520-0426(2002)019<0478:peacfd>2.0.co
Autor:
David M. Babb, Calvin T. Swift, Fuk K. Li, Stephen M. Sekelsky, Graeme L. Stephens, L. Li, Steven C. Reising, Stephen L. Durden, Steven J. Dinardo, Hans W. Rosenberger, G. A. Sadowy, Arlie Huffman
Publikováno v:
Journal of Atmospheric and Oceanic Technology. 18:1345-1353
Cloud measurements at millimeter-wave frequencies are affected by attenuation due to atmospheric gases, clouds, and precipitation. Estimation of the true equivalent radar reflectivity, Ze, is complicated because extinction mechanisms are not well cha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0261d92926d02912666c0e08be9a5fc8
https://doi.org/10.1175/1520-0426(2001)018<1345:roaauc>2.0.co
https://doi.org/10.1175/1520-0426(2001)018<1345:roaauc>2.0.co
Autor:
Zhien Wang, Michael R. Poellot, Robert E. McIntosh, Gerald G. Mace, Kenneth Sassen, Stephen M. Sekelsky
Publikováno v:
Journal of the Atmospheric Sciences. 56:2345-2358
A continental stratus cloud layer was studied by advanced ground-based remote sensing instruments and aircraft probes on 30 April 1994 from the Cloud and Radiation Testbed site in north-central Oklahoma. The boundary layer structure clearly resembled
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1da11cb9b146ebd4f0b90f1b258e0bd9
https://doi.org/10.1175/1520-0469(1999)056<2345:cscacs>2.0.co
https://doi.org/10.1175/1520-0469(1999)056<2345:cscacs>2.0.co
Publikováno v:
Journal of Atmospheric and Oceanic Technology. 16:216-236
Millimeter-wave Doppler spectra obtained from the dual-frequency Cloud Profiling Radar System (CPRS) are used to retrieve both the drop size distribution and the vertical air motion in rain. CPRS obtains collocated spectra at W and Ka bands through a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf6bd76baf8cdb21f5e47e601c46ae0f
https://doi.org/10.1175/1520-0426(1999)016<0216:aodfmw>2.0.co
https://doi.org/10.1175/1520-0426(1999)016<0216:aodfmw>2.0.co
Publikováno v:
Journal of Applied Meteorology. 38:5-28
Multifrequency radar measurements collected at 2.8 (S band), 33.12 (Ka band), and 94.92 GHz (W band) are processed using a neural network to estimate median particle size and peak number concentration in ice-phase clouds composed of dry crystals or a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9dda05e121483293f28e9359dcd71e3
https://doi.org/10.1175/1520-0450(1999)038<0005:pseiip>2.0.co
https://doi.org/10.1175/1520-0450(1999)038<0005:pseiip>2.0.co
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 35:256-270
This paper describes the identification of regions of ice, cloud droplets, rain, mixed-phase hydrometers, and insects in stratiform clouds using 33 and 95 GHz radar measurements of reflectivity, linear-depolarization ratio (LDR), dual-wavelength rati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::77f06071080af48b5a20cb5d521d0c26
https://doi.org/10.1109/36.563264
https://doi.org/10.1109/36.563264