Results 151 to 160 of about 985 (191)

Comparing the cygnss simulator forward scattering model with TDS-1 and cygnss on-orbit DDMS

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017
The CYGNSS (Cyclone GNSS) Mission is a constellation of 8 micro-satellites successfully launched in December 2016. Each satellite carries a GNSS-R (Global Navigation Satellite System Reflectometry) receiver which forms a Level-1 delay-Doppler map (DDM) measurement of reflected GPS L1 C/A-coded signals off the surface of the Earth.
Andrew O'Brien 0001, Joel T. Johnson
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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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Measuring Ice Thickness with Cygnss Altimetry

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
Cyclone Global Navigation Satellite System (CYGNSS) is collecting GPS signals reflected from two high altitude lakes with ice cover during Winter 2017–2018. Coherent reflections occur at the ice/water interface and carrier phase altimetry is used to estimate the draft of the ice cover. Simulated data are created using a forward model. Signal processing
David Mayers, Chris Ruf
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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
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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
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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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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
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The NASA CYGNSS microsat constellation

CubeSats and SmallSats for Remote Sensing IV, 2020
The CYGNSS constellation of eight satellites was launched in December 2016 into a low inclination Earth orbit. Each satellite carries a four-channel bi-static radar receiver which measures signals transmitted by GPS satellites and scattered back into space by the Earth surface.
Christofer S. Ruf, Clara Chew, Darren McKague, Shakeel Asharaf, Mahta Moghaddam   +4 more
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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
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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
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