Results 181 to 190 of about 2,048 (223)
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Theoretical Fundamentals of GNSS Reflectometry
2021GNSS reflectometry usually relies on a model or a criterion which is established in advance, to measure geophysical parameters or detect natural phenomena or man-made objects. The models and criteria can be theoretical or empirical depending on the application scenario and the observation platform.
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FORMOSAT-7R Mission for GNSS Reflectometry
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019The omnipresence Global Navigation Satellite System (GNSS) signals have not only provided high accuracy navigation but also facilitated many remote sensing missions. In a GNSS reflectometry (GNSS-R) mission, the reflected signals are processed to form delay Doppler maps (DDMs) so that the properties including roughness, ocean wind speed, and soil ...
Jyh-Ching Juang +2 more
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2018
This study presents the development and a systematic evaluation study of GNSS reflectometry wind speeds. After establishing a wind speed retrieval algorithm, UK TechDemoSat-1 (TDS-1) derived winds, from May 2015 to July 2017, are compared to the Advanced Scatterometer (ASCAT).
Asgarimehr, Milad (Dr.-Ing.) +2 more
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This study presents the development and a systematic evaluation study of GNSS reflectometry wind speeds. After establishing a wind speed retrieval algorithm, UK TechDemoSat-1 (TDS-1) derived winds, from May 2015 to July 2017, are compared to the Advanced Scatterometer (ASCAT).
Asgarimehr, Milad (Dr.-Ing.) +2 more
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GNSS Reflectometry and Applications
2017© Springer International Publishing AG 2018. When positioning with GNSS, multipath signal is a reflected GNSS signal that is a nuisance and as such needs to be eliminated. Whereas this reflected signal on the one hand is a nuisance for positioning, for environmental monitoring purposes, it could be useful in monitoring sea-wind retrieval, seawater ...
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GPS/GNSS reflectometry nanosatellite demonstration mission
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2002Loss of life, injury and huge economic losses are incurred annually due to irregular and insufficient sea–state information. Figures indicate that, each year, the marine insurance industry pays out over $2 billion in claims for weather–related accidents, while bad weather causes one ship of over 500 t to sink somewhere on the globe every week. Accurate
Martin J. Unwin +2 more
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Expanding the Scope of GNSS Reflectometry
2023Another contribution is the exploration of new modes of GNSS-R, notably a backscattering mode. This includes experiments with new use cases using raw TDS-1 data and the introduction of a backscatter reflection point prediction tool. A new phenomenon termed ""Specular Point Intrusions"", which will have implications for the implementation of the method ...
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Experimental and modelled GNSS Reflectometry response over land
2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2018The applications of spaceborne GNSS reflectometry data over land are investigated in this work using the data collected by the UK TechDemoSat experimental mission. In order to quantify the sensitivity of the GNSS reflections to biomass and soil moisture from real data it is necessary to extract a quantity, like the surface reflectivity, as much as ...
Pierdicca, Nazzareno +4 more
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GNSS reflectometry for remote sensing of soil moisture
2015 IEEE 1st International Forum on Research and Technologies for Society and Industry Leveraging a better tomorrow (RTSI), 2015Global Navigation Satellite System Reflectometry (GNSS-R) is an emerging technique for remote sensing of soil surfaces. In this work, the data collected by a GNSS receiver prototype mounted on a small aircraft are analyzed to retrieve soil moisture. Based on GNSS-R bi-static configuration, direct and reflected GPS signals were measured by a right hand (
JIA, YAN +3 more
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On the Spatial Resolution of GNSS Reflectometry
IEEE Geoscience and Remote Sensing Letters, 2016A method for defining the spatial resolution of a Global Navigation Satellite System reflectometry delay–Doppler map (DDM) and of any derived geophysical product is proposed. An effective spatial resolution is derived as a function of measurement geometry and delay–Doppler (DD) interval, and as a more appropriate representation of resolution than the ...
Maria Paola Clarizia, Christopher S. Ruf
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Great Lake Surface Characterization with GNSS Reflectometry
ION GNSS+, The International Technical Meeting of the Satellite Division of The Institute of Navigation, 2016This effort presents the development of a multi-sensor suite to analyze GNSS reflected signal characteristics as a function of surface conditions of Lake Michigan. The purpose of this sensor system is ultimately to determine how to use GNSS-R to monitor and distinguish liquid freshwater from lake ice, paving the way for routine remote sensing of ...
Seebany Datta-Barua +6 more
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