Results 261 to 270 of about 8,117 (279)

Experimental study for GNSS-R polarimetry

2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
GNSS reflectomtry (GNSS-R) is a remote sensing methodology in which the GNSS satellites are applied for signal transmitters. In GNSS-R studies, an interference strategy is popular. The interference method uses interactions between direct signals from the GNSS satellites and reflected signals by sensing targets.
Ryuta Kato, Hirobumi Saito, Seisuke Fukuda   +2 more
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Spaceborne GNSS-R Minimum Variance Wind Speed Estimator

IEEE Transactions on Geoscience and Remote Sensing, 2014
A Minimum Variance (MV) wind speed estimator for Global Navigation Satellite System-Reflectometry (GNSS-R) is presented. The MV estimator is a composite of wind estimates obtained from five different observables derived from GNSS-R Delay-Doppler Maps (DDMs).
Clarizia, Maria Paola, Ruf, Christopher S., Jales, Philip, Gommenginger, Christine   +3 more
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Forest biomass monitoring with GNSS-R: Theoretical simulations

Advances in Space Research, 2011
Abstract GNSS-Reflectometry (GNSS-R) is a remote sensing technique which performs bistatic measurements of the earth surface scattering. This paper presents some theoretical simulations of the specular scattering coefficient of a forested area, with the aim of demonstrating the potentiality of GNSS-R in monitoring forest biomass.
FERRAZZOLI, PAOLO, GUERRIERO, LEILA, Pierdicca, N, . Rahmoune, R.   +3 more
openaire   +4 more sources

A GNSS-R Geophysical Model Function

2020
A machine learning technique is implemented for retrieving space-borne Global Navigation Satellite System Reflectometry (GNSS-R) wind speed. Conventional approaches commonly fit a function in a predefined form to matchup data in a least-squares (LS) sense, mapping GNSS-R observations to wind speed. In this study, a feedforward neural network is trained
Asgarimehr, Milad (Dr.-Ing.), Zhelavskaya, Irina (Dr.), Foti, Giuseppe, Reich, Sebastian (Prof.), Wickert, Jens (Prof. Dr.)   +4 more
openaire   +1 more source

Ocean Remote Sensing Using GNSS-R

2013
This chapter introduces the essential oceanic application of the GNSS reflectometry, e.g., sea surface altimetry and surface roughness. Other potential areas of interest for oceanography and marine applications are the retrievals of dielectric properties of the surface (related to temperature and salinity) and ship detection. Although the ratio between
Shuanggen Jin, Estel Cardellach, Feiqin Xie   +2 more
openaire   +1 more source

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 Posselt, Mahta Moghaddam   +4 more
openaire   +1 more source

Soil moisture retrieval from GNSS-R signals

2015 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2015
Signals transmitted from Global Navigation Satellite System (GNSS) can be used for soil moisture monitoring after reflection from the Earth's surface. In this paper, the data collected by a GNSS receiver prototype installed on a small aircraft were analyzed.
JIA, YAN, PEI, YUEKUN, SAVI, Patrizia, NOTARPIETRO, RICCARDO   +3 more
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The Pseudo Monostatic Point for Gnss-R

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Recently, the use of spaceborne GNSS-R for sea-target detection has been demonstrated using DDMs collected by SGR-ReSI onboard TDS-1. These DDMs are windowed around the forward scattering specular point. At this point, the sea-surface response is strongest and it is well suited for remote sensing of Earth’s oceans.
Benjamin J. Southwell, Andrew G. Dempster   +1 more
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Considerations on Gnss-R Carrier Phase Altimetry

IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018
The European Space Agency has recently studied, assessed or approved GNSS Reflectometry mission concepts based partly or fully on carrier phase observables for altimetry applications. Examples of these are, respectively, the GEROS-ISS experiment on board the International Space Station, the G- TERN Earth Explorer proposal or the PRETTY cubesat mission,
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GNSS-R ocean altimetry

2021
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