Results 111 to 120 of about 2,512 (168)

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   +1 more source

Backscatter-Modulation Semiconductor Laser Radar

SPIE Proceedings, 1989
When a non-cooperative target is at a distance within the coherence length of a laser, the backscattered light induces modulation signals in the laser power output that can be used for velocimetry and ranging. Backscatter modulation in semiconductor laser diodes has had little practical impact in laser radar because the coherence length of these ...
Peter J. de Groot, Francis X. D'Amato, Gregg M. Gallatin, Robert Dixon, Chandrasekhar Roychoudhuri   +4 more
openaire   +1 more source

Estimating splash pine biomass using radar backscatter

IEEE Transactions on Geoscience and Remote Sensing, 1991
L-band HV multiple-incidence-angle aircraft synthetic aperture radar (SAR) data were analyzed in relation to average stand biomass, basal area, and tree height for 55 slash pine plantations located in northern Florida. This information was used to develop a system of equations to predict average stand biomass as a function of L-band (24.5-cm) radar ...
Hussin, Y.A., Reich, R.M., Hoffer, R.M.
openaire   +2 more sources

Radar backscattering over agricultural bare soils

Journal of Electromagnetic Waves and Applications, 1996
Agricultural surfaces are complex non-isotropic surfaces presenting a main direction due to the rows in combination with various smaller spatial scales (the clods). The applicability of two recent electromagnetic models, able to take account of these anisotropic surfaces, was tested under a variety of roughness encountered on an agricultural watershed (
L. Rakotoarivony, O. Taconet, D. Vidal-Madjar, P. Bellemain, M. Benallegue   +4 more
openaire   +1 more source

HF-induced radar backscatter

Journal of Atmospheric and Terrestrial Physics, 1985
Abstract This paper provides an overview of six poster presentations contributed to the Open Symposium on Active Experiments in Space Plasmas at the XXIst General Assembly of URSI. The six poster presentations deal with HF ionospheric modification and are primarily experimental in nature.
openaire   +1 more source

Evaluating Roughness Models of Radar Backscatter

IEEE Transactions on Geoscience and Remote Sensing, 1987
A unique set of data collected for a soil moisture experiment has been used to evaluate three radar backscatter roughness models. The data were collected by the NASA Space Shuttle flight 41G (SIR-B) synthetic aperture radar (SAR) in an intensively farmed area near Fresno, California.
Edwin Engman, James Wang
openaire   +1 more source

A new radar auroral backscatter experiment

Nature, 1983
In 1982 a new radar auroral backscatter system, SABRE (Sweden and Britain Radar Experiment), commenced operation in northern Europe. Observations with this ground-based system allow estimates to be made of the electric fields in the auroral E-region. As an electric field probe, the coherent radar technique is unique in that measurements are made over a
Nielsen, E., Güttler, E., Thomas, E., Stewart, C., Jones, T., Hedberg, E.   +5 more
openaire   +2 more sources

Radar backscatter measurements over saline ice

International Journal of Remote Sensing, 1990
Abstract During the 1984 and 1985 winter seasons, radar backscatter measurements were performed on artificial sea ice at the U.S. Army Cold Regions Research and Engineering Laboratory (CRREL) at Hanover, New Hampshire. Radar data were collected at selected frequencies in the 4-17 GHz region for incidence angles from 0 to 60° with like and cross ...
S. GOGINENI, R. K. MOORE, Q. WANG, A. GOW, R. G. ONSTOTT   +4 more
openaire   +1 more source

Radar backscattering of forest stands

International Journal of Remote Sensing, 1985
Abstract Research on the potential applications of microwave remote sensing in agriculture is conducted in the Netherlands by the ROVE team. Since active microwave remote sensing, featuring its all-weather capability, also seems to be a promising tool for forest classification, especially on a global scale, the Wageningen Agricultural University ...
openaire   +3 more sources

Acoustic and radar sea surface backscatter

Journal of Geophysical Research: Oceans, 1982
Theoretical predictions of sea surface reverberation are compared with representative acoustic and radar data to determine those mechanisms responsible for backscatter. Predictions of the composite roughness scattering model are compared with data in three frequency ranges, 2–5 kHz acoustic (428‐and 1228‐MHz radar), 20–25 kHz acoustic (4455‐MHz radar),
Suzanne T. McDaniel, Arthur D. Gorman
openaire   +1 more source