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Dual-sense circularly polarized array antenna for GPS L1/L2 bands and L-band satellite receivers. [PDF]
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Resolving Inland Waterways with CYGNSS
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021Observations made by the NASA Cyclone Global Navigation Satellite System (CYGNSS) of inland waterways can be used to resolve changes in water boundaries on time scales from days to weeks to months. An example of change on a daily time scale is the response of river width to rapid changes in stream flow rate.
Christopher Ruf +3 more
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Analysis of CYGNSS Data for Soil Moisture Retrieval
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2019 Data from the CYGNSS mission, originally conceived to monitor tropical cyclones, are being investigated here for land applications as well. In this paper, a methodology for soil moisture (SM) retrieval from CYGNSS data is presented. The approach derives Level 3 gridded daily SM estimations, over the latitudinal band covered by CYGNSS, at a resolution ...
Nicolas Floury +2 more
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An Evaluation of NOAA CyGNSS Winds Derived from v3.0 CyGNSS Normalized Bistatic Radar Cross Section
2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021The NOAA track-wise algorithm, used to infer sea surface wind speed from CyGNSS normalized bistatic radar cross section (NBRCS), is being used in conjunction with v3.0 NBRCS. A performance analysis is provided where NOAA CyGNSS winds derived from v2.1 NBRCS are compared with those derived from v3.0 NBRCS, using available data from August 2018 to ...
Faozi Saïd +2 more
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Cygnss constellation intercalibration
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017The Cyclone Global Navigation Satellite System (CYGNSS) mission uses a constellation of 8 satellites to measure ocean winds in the tropics with high temporal resolution (∼3 hr median, 7 hr mean revisit). Focusing on the measurement of winds in tropical cyclones, each satellite contains a Global Navigation Satellite System reflectometry (GNSS-R ...
Darren S. McKague, Christopher S. Ruf
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On-Orbit Trending of CYGNSS Data
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019Shortly after its launch in December of 2016, the Cyclone Global Navigation Satellite System (CYGNSS) constellation began producing estimates of sea surface wind speeds. With its unique remote sensing method and use of eight satellites, the constellation is able to produce winds with shorter revisit times and in more intense weather than other sea ...
Darren S. McKague, Christopher S. Ruf
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Comparing the cygnss simulator forward scattering model with TDS-1 and cygnss on-orbit DDMS
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2017The 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, 2012The 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 +7 more
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Measuring Ice Thickness with Cygnss Altimetry
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018Cyclone 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), 2016Calibration 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 +2 more
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