Results 171 to 180 of about 843 (193)

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

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
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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

Sensitivity of CYGNSS-derived soil moisture to global precipitation

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
In this paper, the sensitivity of Cyclone Global Navigation Satellite System (CYGNSS) data to precipitation is investigated. First, the soil moisture (SM) is estimated from the CYGNSS and Soil Moisture Active Passive (SMAP) data based on a three-layer model.
Qingyun Yan, Shuanggen Jin, Weimin Huang 0001, Yan Jia 0004   +3 more
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An Overview of NOAA CYGNSS Wind Product Version 1.0

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
In November 2019, the Ocean Surface Winds Team at NOAA-NESDIS-STAR released to the public their first version of sea surface winds for the Cyclone Global Navigation Satellite System (v1.0). The reported winds are provided on a 25km grid along each track. A boxcar averaging step is included in order to remove unwanted noise in the signal.
Faozi Saïd, Zorana Jelenak, Jeonghwan Park 0001, Qi Zhu 0009, Paul S. Chang   +4 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

Global Soil Moisture Estimation Using CYGNSS Data

IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, 2020
In this paper, an approach for estimating soil moisture (SM) from Cyclone Global Navigation Satellite System (CYGNSS) data is developed. Here, a three-layer model of air, vegetation cover, and soil is proposed. In application, the surface reflectivity along with its statistics are derived from the CYGNSS data and the ancillary vegetation opacity data ...
Qingyun Yan, Shuanggen Jin, Weimin Huang 0001, Yan Jia 0004   +3 more
openaire   +1 more source

Science Impacts of the NASA CYGNSS Mission

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium, 2022
Christopher Ruf, Clara C. Chew, Mahta Moghaddam, Derek J. Posselt, Zhaoxia Pu   +4 more
openaire   +1 more source

Analysis of Wetland Extent Retrieval Accuracy Using Cygnss

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Spaceborne GNSS Reflectometry (GNSS-R) measurements have shown strong coherent scattering over inland waters. It has been recognized that GNSS-R could be utilized for monitoring the global surface water distribution by making dynamic maps of wetlands as well as rapid response to flood events.
Eric Loria, Andrew O'Brien 0001, Valery U. Zavorotny, Marco Lavalle, Clara C. Chew, Rashmi Shah, Cinzia Zuffada   +6 more
openaire   +1 more source

Investigations into CYGNSS-Based Soil Moisture Retrieval Algorithms

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
NASA’s Cyclone Global Navigation Satellite System (CYGNSS) receives the forward scattered L-band GNSS signals between ±37° latitudes. The received signals over land are previously shown to be highly sensitive to surface soil moisture (SM). Assuming coherent reflections over land, the CYGNSS bistatic radars can provide a spatial resolution of around 7 ×
Orhan Eroglu, Dylan R. Boyd, Ali Cafer Gürbüz, Mehmet Kurum   +3 more
openaire   +1 more source