Results 11 to 20 of about 843 (193)
Variational Retrievals of High Winds Using Uncalibrated CyGNSS Observables [PDF]
Remote Sensing, 2020 This study presents a new retrieval approach for obtaining wind speeds from CyGNSS level-1 observables. Unlike other existing approaches, (1) this one is a variational technique that is based on a physical forward model, (2) it uses uncalibrated bin raw ...
Estel Cardellach +2 more
exaly +4 more sources
INTRODUCING THE GLOBAL MAPPING OF FLOOD DYNAMICS USING GNSS-REFLECTOMETRY AND THE CYGNSS MISSION [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2022 This study uses the observations from the Cyclone GNSS (CYGNSS) mission to analyze their potential for a global mapping of the floods dynamics in the pan-tropical area using Global Navigation Satellite System (GNSS) Reflectometry (GNSS-R).
P. Zeiger, F. Frappart, J. Darrozes
doaj +2 more sources
Remote Sensing, 2023 Drought monitoring is crucial for various sectors, and soil moisture data play a pivotal role, especially in agricultural contexts. This study focuses on the recent CYGNSS Level 3 soil moisture data derived from the NASA Cyclone Global Navigation ...
Zhaolu Hou, Zhaoxia Pu
doaj +2 more sources
Validation of NOAA CyGNSS Wind Speed Product with the CCMP Data
Remote Sensing, 2021 The National Aeronautics and Space Administration (NASA) Cyclone Global Navigation Satellite System (CyGNSS) mission was launched in December 2016, which can remotely sense sea surface wind with a relatively high spatio-temporal resolution for tracking ...
Xiaohui Li +5 more
doaj +2 more sources
Use of an End-to-End-Simulator to Analyze CYGNSS. [PDF]
J Atmos Ocean Technol, 2018 AbstractTropical convection during the onset of two Madden–Julian oscillation (MJO) events, in October and December of 2011, was simulated using the Weather Research and Forecasting (WRF) Model. Observations from the Dynamics of the MJO (DYNAMO) field campaign were assimilated into the WRF Model for an improved simulation of the mesoscale features of ...
Hoover KE +5 more
europepmc +5 more sources
First Measurement of Soil Freeze/Thaw Cycles in the Tibetan Plateau Using CYGNSS GNSS-R Data
Remote Sensing, 2020 The process of soil freezing and thawing refers to the alternating phase change of liquid water and solid water in the soil, accompanied by a large amount of latent heat exchange.
Xuerui Wu +6 more
doaj +2 more sources
An Effective Land Type Labeling Approach for Independently Exploiting High-Resolution Soil Moisture Products Based on CYGNSS Data [PDF]
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2022 Recently, soil moisture (SM) has been estimated using Cyclone Global Navigation Satellite System (CYGNSS) data. Machine learning (ML) algorithms for CYGNSS SM estimation can minimize unpredictable influences and help improve the accuracy of SM retrieval.
Yan Jia +5 more
doaj +2 more sources
Improved GPS-Based Single-Frequency Orbit Determination for the CYGNSS Spacecraft Using GipsyX
Navigation, 2023 This paper presents methods for the precise orbit determination (POD) of a satellite in the CYGNSS constellation based on available single-frequency GPS code and carrier measurements. The contributions include the development and evaluation of procedures
Alex V. Conrad +4 more
doaj +3 more sources
CYGNSS Surface Heat Flux Product Development [PDF]
Remote Sensing, 2019 Ocean surface heat fluxes play a significant role in the genesis and evolution of various marine-based atmospheric phenomena, from the synoptic scale down to the microscale. While in-situ measurements from buoys and flux towers will continue to be the standard in regards to surface heat flux estimates, they commonly have significant gaps in temporal ...
Juan A. Crespo +2 more
openaire +3 more sources
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 +4 more
openaire +3 more sources