Results 131 to 140 of about 365 (171)

Water Depth Retrieval in the Everglades Using Cygnss

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
Quantitative observations of dynamic changes in water extent and depth of the world's wetlands are currently limited by traditional remote sensing methods, which have difficulty observing surface water beneath dense vegetation and clouds. A novel remote sensing technique known as GNSS Reflectometry (GNSS-R) has shown great potential in the detection of
Brandi Downs, Andrew O'Brien 0001, Mary Morris, Cinzia Zuffada   +3 more
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Earth antenna temperature variability for CYGNSS

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Calibration algorithms are being developed for the CYclone Global Navigation Satellite System (CYGNSS) mission in anticipation of a late-2016 launch date. Antenna temperature (TA) of oceanic scenes will be used to confirm the relationship between receiver noise temperature and physical temperature—which will drift over time. In this work, we develop an
Mary Morris, David D. Chen, Christopher S. Ruf   +2 more
openaire   +1 more source

The CYGNSS nanosatellite constellation hurricane mission

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
The Cyclone Global Navigation Satellite System (CYGNSS) is a spaceborne mission concept focused on tropical cyclone (TC) inner core process studies. CYGNSS attempts to resolve the principle deficiencies with current TC intensity forecasts, which lies in inadequate observations and modeling of the inner core.
Christopher S. Ruf, Scott Gleason 0001, Zorana Jelenak, Stephen J. Katzberg, Aaron J. Ridley, Randall Rose, John Scherrer, Valery U. Zavorotny   +7 more
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The GNSS-R Cygnss Mission: an Update

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
The CYGNSS constellation was successfully launched on 15 Dec 2016 and has been operating continuously in science data-taking mode since March 2017. Updates will be presented on the mission status, calibration and validation activities for its science data products, and recent scientific applications of the measurements.
Chris Ruf, Darren McKague, Mary Morris, Derek J. Posselt, Mahta Moghaddam   +4 more
openaire   +1 more source

The NASA CYGNSS SmallSat Constellation

2023
The NASA Cyclone Global Navigation Satellite System (CYGNSS) is a constellation of eight microsatellites in low earth orbit at ~525 km altitude and 35 deg inclination. CYGNSS was launched in December 2016 for a planned 2 year mission and 7 of the 8 spacecraft continue to operatue nominally as of May 2023.
Ruf, Christopher, McKague, Darren, Chew, Clara, Warnock, April, Wells, William   +4 more
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CYGNSS Observations of Ocean Winds and Waves

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The cyclone global navigation satellite system (CYGNSS), launched on December 15, 2016, represents the first dedicated GNSS-R satellite mission specifically designed to retrieve ocean surface wind speeds in the Tropical Cyclone (TC) environment [1]. CYGNSS uses a constellation of eight microsatellite observatories that can receive both the direct and ...
Paul S. Chang, Zorana Jelenak, Faozi Said, Seubson Soisuvarn   +3 more
openaire   +1 more source

First Results on Differential Phase Altimetry with CYGNSS

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 2023
Phase altimetry has been recently introduced for high precision surface height measurements in satellite global navigation satellite system reflectometry. In the presence of coherent scattering the effectiveness of the technique has been demonstrated for sea surface at low grazing angle as well as for rivers and lakes.
Addabbo P., Di Bisceglie M., Comite D., Galdi C., Neira M. M., Pierdicca N.   +5 more
openaire   +1 more source

Storm surge prediction with cygnss winds

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The NASA Earth Venture Cyclone Global Navigation Satellite System (CYGNSS) is a constellation of eight observatories in a 35° inclination, ∼530 km altitude Earth orbit. Each observatory carries a 4-channel bistatic wind scatterometer receiver. Measurements of the ocean surface scattering cross section are converted to 10 meter-referenced wind speed ...
April M. Warnock, Christopher S. Ruf, Mary Morris   +2 more
openaire   +1 more source

Investigating “rapid revisit” observations of cygnss

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The Cyclone Global Navigation Satellite System (CYGNSS) mission launched Dec. 2016 and will provide ocean surface wind speed measurements from an eight satellite constellation using GPS reflectometry observations. The nature of CYGNSS coverage results in some locations on Earth experiencing multiple wind speed measurements within a short period of time
Jeonghwan Park 0001, Joel T. Johnson, Andrew O'Brien 0001, Yuchan Yi   +3 more
openaire   +1 more source

Assessing the Altimetric Measurement from CYGNSS Data

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The Cyclone Global Navigation Satellite System (CYGNSS) mission was designed to study hurricane intensification by measuring wind speeds in tropical cyclones. However, the delay-Doppler maps (DDM) that are produced can be used to estimate the sea surface height (SSH) at the specular reflection point on the ocean surface.
Cinzia Zuffada, Bruce J. Haines, George Hajj, Zhijin Li, Stephen T. Lowe, Rashmi Shah, Jake Mashburn, Penina Axelrad, Andrew O'Brien 0001, Paolo Cipollini, Valery U. Zavorotny, Alexander G. Voronovich   +11 more
openaire   +2 more sources