Results 31 to 40 of about 15,182,981 (294)
Precision Bounds in GNSS-R Ocean Altimetry
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014 Peer ...
Pascual Biosca, Daniel +5 more
openaire +3 more sources
Space Weather, 2022 The Global Navigation Satellite System (GNSS) has significantly facilitated the detection of ionospheric irregularities. Nevertheless, the ground‐based GNSS stations are inhomogeneously distributed around the world with large gaps, especially in the vast
Xiaodong Ren +6 more
doaj +1 more source
A new multipath mitigation method for GNSS receivers based on antenna array [PDF]
, 2012 the potential of small antenna array for multipath mitigation in GNSS systems is considered in this paper. To discriminate the different incoming signals (Line of sight and multipaths), a new implementation of the well known SAGE algorithm is proposed ...
Rougerie, Sébastien +4 more
core +1 more source
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
doaj +1 more source
, 2023 peer reviewedSatellite altimetry has been employed since the Skylab mission in 1973, and subsequent satellite launches have aimed to gather altimetric data.
Buendía, Raquel Navarro +2 more
core
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
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
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
openaire +3 more sources
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
Advanced Robotics Research, EarlyView.Autonomous field robots equipped with ISFET‐based sensors enable rapid, spatially resolved soil nutrient analysis directly in the field. An automated system based on the BoniRob platform is presented for standardized on‐site extraction and measurement of key macronutrients and soil pH.
Vadim Riedel +3 more
wiley +1 more source