Results 31 to 40 of about 14,281,997 (294)
The Use of SMAP-Reflectometry in Science Applications: Calibration and Capabilities
Remote Sensing, 2019 The Soil Moisture Active Passive (SMAP) mission became one of the newest spaceborne Global Navigation Satellite System−Reflectometry (GNSS-R) missions collecting Global Positioning System (GPS) bistatic radar measurements when the band-pass center ...
Nereida Rodriguez-Alvarez +4 more
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Retrieval of Ocean Surface Wind Speed Using Reflected BPSK/BOC Signals
Remote Sensing, 2020 The Global Navigation Satellite System (GNSS) has become a valuable resource as a remote sensing technique. In the past decade, the use of reflected GNSS signals for sensing the Earth, also known as GNSS reflectometry (GNSS-R), has grown rapidly.
Hao-Yu Wang, Jyh-Ching Juang
doaj +1 more source
Numerical Computation of the Electromagnetic Bias in GNSS-R Altimetry [PDF]
IEEE Transactions on Geoscience and Remote Sensing, 2016 In radar altimetry, the electromagnetic (EM) bias is originated by the smaller reflectivity of wave crests than troughs; thus, the average sea surface height is underestimated. Bias uncertainty is currently the largest factor in altimetry error budgets.
Ghavidel, Ali +2 more
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Spatial Resolution in GNSS-R Under Coherent Scattering [PDF]
IEEE Geoscience and Remote Sensing Letters, 2020 Global Navigation Satellite Systems Reflectometry can be understood as a multistatic radar using satellite navigation signals as signals of opportunity. The scattered signals over sea ice, flooded areas, even under dense vegetation, and in some cases, over land show a significant coherent component.
openaire +4 more sources
On the synergy of airborne GNSS-R and landsat 8 for soil moisture estimation [PDF]
, 2015 While the synergy between thermal, optical, and passive microwave observations is well known for the estimation of soil moisture and vegetation parameters, the use of remote sensing sources based on the Global Navigation Satellite Systems (GNSS) remains ...
Martinez Fernandez, Jose +6 more
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Advanced Robotics Research, EarlyView.Visual teach‐and‐repeat (VTR) navigation allows robots to learn and follow routes without building a full metric map. We show that navigation accuracy for VTR can be improved by integrating a topological map with error‐drift correction based on stereo vision.
Fuhai Ling, Ze Huang, Tony J. Prescott
wiley +1 more source
Remote SensingGlobal Navigation Satellite System (GNSS) Radio Occultation (RO) and GNSS Reflectometry (GNSS-R) are the two major spaceborne GNSS remote sensing (GNSS-RS) techniques, providing observations of atmospheric profiles and the Earth’s surface. With the rapid
Weihua Bai +11 more
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Modeling and Simulation of GNSS-R Observables With Effects of Swell
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020 Global navigation satellite system-reflectometry (GNSS-R) has attracted much attention in remote sensing, such as sea wind speed detection, soil moisture, and sea ice.
Bowen Li +4 more
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Study of Delay Drift in GNSS-R Altimetry
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014 Differently to the case of a conventional spaceborne nadir-looking mono-static radar altimeter, where the fly-around time of the pulses remains basically constant (assuming an almost circular orbit around an almost spherical Earth), the bistatic geometry of GNSS-R with the transmitter and the receiver embarked on different satellites imprints a ...
Manuel Martín-Neira +2 more
openaire +2 more sources
GNSS signal acquisition in the presence of sign transitions [PDF]
, 2009 The next generation of Global Navigation Satellite Systems (GNSS), such as Galileo [1] and GPS modernization [2], will use signals with equal code and bit periods, which will introduce a potential sign transition in each segment of the signal processed ...
Kewen Sun +3 more
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