Results 91 to 100 of about 779,702 (326)
Radar High Resolution Range & Micro-Doppler Analysis of Human Motions [PDF]
, 2009 In radar imaging it is well known that relative motion or deformation of parts of illuminated objects induce additional features in the Doppler frequency spectra.
Ghaleb, A. +3 more
core
Impacts of Atmospheric Rivers in Central Greenland: Snowfall, Clouds, and Atmospheric State
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 2, 28 January 2026.Abstract Atmospheric rivers (ARs) are long bands of strong horizontal water vapor transport responsible for over 90% of total integrated vapor transport (IVT) in extratropical and polar regions. Using a 12‐year record (2010–2022) of ground‐based remote sensing, radiosonde, snow stake, and reanalysis data from Summit Station, Greenland, we quantify the ...
A. E. Wedum +5 more
wiley +1 more source
Applied Sciences, 2019 Under the same principle, laser radar could be more sensitive to the micro-Doppler (m-D) effect due to its wave length, as the characteristic of multi-resolution, S transform could reduce the influence of the micro-Doppler component and enhance the ...
Bo Zang +4 more
doaj +1 more source
A Network of Portable, Low-Cost, X-Band Radars [PDF]
, 2012 Radar is a unique tool to get an overview on the weather situation, given its high spatio- temporal resolution. Over 60 years, researchers have been investigating ways for obtaining the best use of radar.
Allegretti, Marco +7 more
core +2 more sources
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 2, 28 January 2026.Abstract The characteristics of Pekeris modes as well as Lamb modes are investigated using the new reanalysis data set JAWARA, which spans over 19 years and covers the entire middle atmosphere. Pekeris modes are a class of global normal modes whose energy is trapped in two height regions that is, around the stratopause and the surface, while the energy
Hiroto Sekido, Kaoru Sato
wiley +1 more source
The Journal of Engineering, 2019 The authors report a target separation detection and motion parameter estimation method based on the time-varying autoregressive (TVAR) model. The TVAR model is used to extract the instantaneous Doppler frequencies of multiple targets or scattering ...
Yaolin Zhang +3 more
doaj +1 more source
Distribution and size of elements of Saturn's rings as inferred from 12-cm radar observations [PDF]
A 64m radar antenna was used to observe Saturn's rings at 12.6 cm wavelength, with reduced Doppler spread. The results show a positive radar return corresponding to about a 60 percent return from an isotropic scatterer with the projected area of the ...
Morris, G. A., Jr.
core +1 more source
In Situ Observations of Ice Crystal Chain Aggregates in Winter Storms
Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.Abstract Ice crystal chain aggregates—linear structures of conjoined monomer crystals—have previously been observed in strongly electrified deep convection, likely forming via electric‐field‐enhanced aggregation. The NASA Investigation of Microphysics and Precipitation for Atlantic Coast‐Threatening Snowstorms field campaign conducted aircraft‐based ...
Christian M. Nairy +9 more
wiley +1 more source
Radar detectability of light aircraft micro‐Doppler modulation
IET Radar, Sonar & NavigationThe critical role of specifying micro‐Doppler mode performance in the modelling and development of modern radar systems is investigated. The authors focus on the detection of micro‐Doppler modulation from light aircraft, analysing data from eight ...
Robert John Berndt +3 more
doaj +1 more source
Theory and observations of ice particle evolution in cirrus using Doppler radar: evidence for aggregation [PDF]
, 2006 Vertically pointing Doppler radar has been used to study the evolution of ice particles as they sediment through a cirrus cloud. The measured Doppler fall speeds, together with radar-derived estimates for the altitude of cloud top, are used to estimate a
A. J. Illingworth +27 more
core +2 more sources