Results 141 to 150 of about 365 (171)

An Assessment of CYGNSS Ocean Wind Speed Products

2021
<p>Global Navigation Satellite System-Reflectometry (GNSS-R) is an innovative and rapidly developing approach to Earth Observation that makes use of signals of opportunity from Global Navigation Satellite Systems, which have been reflected off the Earth’s surface.
Hammond, Matthew, Foti, Giuseppe, Gommenginger, Christine, Srokosz, Meric, Floury, Nicolas   +4 more
openaire   +2 more sources

Soil Moisture Estimation Using CYGNSS Constellation

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
The main objective of this study is to propose an inversion algorithm for the estimation of soil moisture from CYGNSS data. The algorithm based on the change detection technique is applied to CYGNSS data after several corrections taking in account the incidence effects as well as different noises. The algorithm is validated on a one study site in North
Zribi, Mehrez, Huc, Mireille, Antokoletz, Sebastian, Le Page, Michel, Pierdicca, Nazzareno, Baghdadi, Nicolas   +5 more
openaire   +2 more sources

The nasa cygnss mission: Overview and status update

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 microsatellite observatories that was launched into a low (35°) inclination, low Earth orbit on 15 December 2016. Each observatory carries a 4-channel GNSS-R bistatic radar receiver.
Christopher Ruf, Scott Gleason 0001, Aaron J. Ridley, Randall Rose, John Scherrer   +4 more
openaire   +1 more source

Enabling Sampling Properties of the Cygnss Satellite Constellation

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The CYGNSS constellation of eight smallsats was successfully launched in low Earth orbit on December 15, 2016. Each satellite carries a four channel bistatic radar receiver which measures GPS signals scattered from the Earth surface, from which ocean surface wind speed is determined.
Christopher Ruf, Charles Bussy-Virat, Darren McKague, Aaron J. Ridley, Mary Morris   +4 more
openaire   +1 more source

Analysis of CYGNSS Data for Soil Moisture Applications

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
An analysis of CYGNSS data is presented, with the objective of assessing the potentials of these data for land applications. The GPS-Reflections over land acquired by the CYGNSS observatories are exploited to detect properties of the land soil moisture.
Maria Paola Clarizia, Nazzareno Pierdicca, Fabiano Costantini   +2 more
openaire   +1 more source

Monitoring Land Surface Hydrology Using Cygnss

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The Cyclone Global Navigation Satellite System (CYGNSS) is a constellation of eight small satellites, each of which carries specialized GNSS receivers to record surface-reflected GNSS signals. The L-band signals recorded by CYGNSS have been shown to be sensitive to land surface hydrologic variables, including near-surface soil moisture and inundation ...
Clara C. Chew, Eric E. Small, Erika Podest   +2 more
openaire   +1 more source

Ocean Surface Altimetry with CyGNSS

2017
CyGNSS is a constellation of 8 small satellites launched in December 2016 that carries the Surrey Satellite Technologies (SSTL) SGR-ReSI GNSS Reflections (GNSS-R) receiver. Developed as the primary science instrument for CyGNSS, the SGR-ReSI receiver performs real time onboard navigation and generates delay-Doppler correlation maps for Earth reflected ...
Jake, Mashburn, Axelrad, Penina, Lowe, Stephen, Zuffada, Cinzia, Masters, Dallas   +4 more
openaire   +1 more source

Monitoring GPS Eirp for Cygnss Level 1 Calibration

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
The effective isotropic radiated power (EIRP) of the Global Positioning System (GPS) determines the power incident on the Earth surface. It is critical to the CYGNSS mission's Level 1 calibration of normalized bistatic radar cross section (NBRCS). This paper reports a dynamic EIRP calibration algorithm that uses the CYGNSS direct signal to correct the ...
Tianlin Wang, Christopher Ruf, Scott Gleason 0001, Darren McKague, Andrew O'Brien 0001, Bruce P. Block   +5 more
openaire   +1 more source

Simulation Study of Cygnss Observability of Dynamic Inundation Events

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
The Cyclone Global Navigation Satellite System (CYGNSS) has recently shown exciting potential for GNSS reflectometry (GNSS-R) to resolve small-scale and dynamic hydrological features over land (such as rivers, lakes, wetlands, and urban flooding), even when obstructed by dense vegetation.
Brandi Downs, Eric Loria, Andrew O'Brien 0001, Valery U. Zavorotny, Cinzia Zuffada   +4 more
openaire   +1 more source

Towards An Ocean Altimetry Product Using Cygnss

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
This paper presents recent work being done to produce a new GNSS Reflectometry (GNSS-R) ocean altimetry product using data from NASA’s CYGNSS Mission, a constellation of 8 small satellites that measure reflected GPS signals off of the surface of the ocean.
Eric Loria, Jake Mashburn, Andrew O'Brien 0001, Penina Axelrad, Cinzia Zuffada, Zhijin Li   +5 more
openaire   +1 more source