Results 221 to 230 of about 3,815 (246)

Mobile GNSS reflectometry measurements

2020
<p>A major benefit of ground-based GNSS reflectometry (GNSS-R) over e.g. traditional tide gauge installations is the lower cost and basically maintenance-free operations. Still, a geodetic GNSS antenna is not exactly free of charge, so using cheaper equipment can make the technology available to even more people ...
Joakim Strandberg, Rüdiger Haas
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Theory of GNSS Reflectometry

2013
The GNSS-reflectometry works as a bi-static radar system in which the transmitter and the receiver are separated by a significant distance. This Chapter compiles different theoretical aspects to understand the GNSS signals after their reflection of the Earth surface, including multi-static system, specular and diffuse scattering, delay and doppler ...
Shuanggen Jin, Estel Cardellach, Feiqin Xie   +2 more
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Soil moisture content estimation using GNSS reflectometry (GNSS-R)

2017 Fifth International Conference on Aerospace Science & Engineering (ICASE), 2017
Global Navigation Satellite System-Reflectometry (GNSS-R) is defined as a bistatic radar system. GNSS-R has a unique potential in microwave remote sensing application. The focus of this paper is the feasibility of estimating soil moisture content using GPS-L1 scattered or reflected signals from the earth's surface.
Jabir Shabbir Malik, Zhang Jingrui, Najam Abbas Naqvi   +2 more
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Theoretical Fundamentals of GNSS Reflectometry

2021
GNSS 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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Ship detection using GNSS-reflectometry in backscattering configuration

2018 IEEE Radar Conference (RadarConf18), 2018
The chance of exploiting the Global Navigation Satellite Systems-Reflectometry (GNSS-R) remote sensing technology in the field of maritime surveillance and ship traffic monitoring has been explored in the very recent past. The conventional bistatic GNSS-R is based on the acquisition of GNSS navigation messages in a forward-scattering geometry, where ...
DI Simone A., Braca P., Millefiori L. M., Willett P.   +3 more
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TDS-1 GNSS Reflectometry

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.), Wickert, Jens (Prof. Dr.), Reich, Sebastian (Prof.)   +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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FORMOSAT-7R Mission for GNSS Reflectometry

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
The 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, Yung-Fu Tsai, Chen-Tsung Lin   +2 more
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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, 2002
Loss 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, J. Douglas Liddle, Susan J. Jason   +2 more
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Expanding the Scope of GNSS Reflectometry

2023
Another 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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