Results 181 to 190 of about 7,805 (237)

Study on the spatiotemporal variation mechanisms of soil moisture in maize fields. [PDF]

Sci Rep
Lan L, Zhang T, Wang B, He F, Wu X, Bao J.   +5 more
europepmc   +1 more source

Sea ice and snow characteristics shape polar bear habitat selection in Hudson Bay

Nab C, Cross L, Northrup J, Landy J, Stroeve J, Johnson T, Mallett R, Derocher A, McGeachy D, Richardson E.   +9 more
europepmc   +1 more source

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Dependence of radar backscatter on coniferous forest biomass

IEEE Transactions on Geoscience and Remote Sensing, 1992
Two independent experimental efforts have examined the dependence of radar backscatter on above-ground biomass of monospecie conifer forests using polarimetric airborne SAR data at P-, L- and C-bands. Plantations of maritime pines near Landes, France, range in age from 8 to 46 years with above-ground biomass between 5 and 105 tons/ha.
M C Dobson, F T Ulaby, A Beaudoin
exaly   +2 more sources

Radar Backscatter Mapping Using TerraSAR-X

IEEE Transactions on Geoscience and Remote Sensing, 2011
Global backscatter data can be used for accurate synthetic aperture radar (SAR) performance estimation and optimizing instrument settings for SAR systems, e.g. the TerraSAR-X mission (TSM) and the TanDEM-X mission (TDM). The goal of this work is the generation of X-band backscatter maps by mosaicking images acquired by the TSM. An algorithm that allows
Paola RIZZOLI, Benjamin Bräutigam, Steffen Wollstadt   +2 more
exaly   +3 more sources

Radar-enabled backscatter communication

2022 56th Asilomar Conference on Signals, Systems, and Computers, 2022
In this work, we propose to use the echoes generated by a radar as a carrier waveform to establish and sustain a communication link between an ambient backscatter transmitter (tag) and a destination node (reader): we refer to this novel architecture as radar-enabled backscatter communication.
Johnston J., Venturino L., Grossi E., Lops M., Wang X.   +4 more
openaire   +2 more sources

On the effects of vegetation on radar backscattering

2016 2nd International Conference on Advanced Technologies for Signal and Image Processing (ATSIP), 2016
Studying the hydrological cycle has always aroused great interest that the stakes are as significant as varied. The understanding of the phenomena of droughts and floods has become essential in the selection and distribution of agricultural crops. In addition, the water and energy fluxes at the soil / atmosphere interface are strongly dependent on soil
Ibtissem Hosni, Lilia Bennaceur Farah, Saber Mohamed Naceur, Imed Riadh Farah   +3 more
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Multichannel radar backscatter communication and localization

2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014
This paper concerns the use of wideband RF backscatter from semi-passive RF tags for energy-efficient wireless telemetry. Using LFM (Linear Frequency Modulated) signals from a radar base station, we present a method for joint ranging and communications with a distributed set of sensor nodes. Backscatter signaling from each node results in modulation on
Itay Cnaan-On, Stewart J. Thomas, Matthew S. Reynolds, Jeffrey L. Krolik   +3 more
openaire   +1 more source

Experiments on the Radar Backscatter of Snow

IEEE Transactions on Geoscience Electronics, 1977
The 1-8-GHz microwave active spectrometer (MAS) system was used to measure the backscatter response from ground covered with a relatively thin layer of snow (up to 15 cm) in the 1975 winter. Except for one dry snow data set, the results of this experiment pertain to wet snow conditions.
Fawwaz T. Ulaby, W. H. Stiles, L. F. Dellwig, B. C. Hanson   +3 more
openaire   +1 more source

Variability in the measurement of radar backscatter

IEEE Transactions on Antennas and Propagation, 1976
A variety of systems and platforms have been used over the past three decades to acquire radar backscatter data of terrain. The variability in the reported data was evaluated for agricultural crops under "similar" phenological conditions and for approximately the same sensor parameters (frequency, polarization, and angle of incidence).
T. Bush, F. Ulaby
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A comparative study of RADAR Ka-band backscatter

SPIE Proceedings, 2014
Ka-band RADAR frequency range has not yet been used for Synthetic Aperture Radar (SAR) from space so far, although this technology may lead to important applications for the next generation of SAR space sensors. Therefore, feasibility studies regarding a Ka-band SAR instrument have been started [1][2], for the next generation of SAR space sensors.
Daniele Mapelli, Nazzareno Pierdicca, Leila Guerriero, Paolo Ferrazzoli, Eduardo Calleja, Björn Rommen, Davide Giudici, Andrea Monti-Guarnieri   +7 more
openaire   +1 more source