Results 81 to 90 of about 19,915 (242)

Landfall Reorganizes Eyewall Boundary Layer Transport and Scale Coupling in Typhoon Hato (2017)

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Landfall reorganizes the tropical cyclone eyewall boundary layer (BL) through elevated surface roughness and reduced enthalpy fluxes. Using a 100‐m resolution nested large‐eddy simulation of Typhoon Hato (2017), we compare eyewall BL structures before and during landfall.
Ping Zhou, Zhongming Gao, Yulong Ma, Zikai Lin, Yongwei He, Jiagui Huang, Muxian Chen, Lei Li   +7 more
wiley   +1 more source

Micro-Doppler Based Detection and Tracking of UAVs with Multistatic Radar [PDF]

, 2016
This paper presents an approach for detection and tracking a micro-UAV using the multistatic radar NetRAD. Experimental trials were performed using NetRAD allowing for analysis of real data to assess the difficulty of detection and tracking of a micro ...
Griffiths, H, Ritchie, Matthew, Francesco Fioranelli, Alexander Charlish, Hoffman, F, Griffiths, Hugh, Fioranelli, Francesco, Charlish, A, Folker Hoffmann, Charlish, Alexander, Ritchie, MA, Fioranelli, F, Hugh Griffiths, Matthew Ritchie, Hoffmann, Folker   +14 more
core   +1 more source

Observations of Electric Fields Sounding in the Mature Stage of a Thunderstorm

Geoscience Data Journal, Volume 13, Issue 3, July 2026.
Successive electric field soundings separated by only 6 min provided a rare view of charge structure of a mature thunderstorm. The observations reveal horizontally inhomogeneous charge regions, an unusually deep upper negative layer, and charge features that cannot be readily explained by current thunderstorm electrification mechanisms. ABSTRACT In the
Xinglu Jiang, Tinglong Zhang, Zhe Li, Yunfeng Liu, Ying Wen, Lingjie Kong, Junming Gong   +6 more
wiley   +1 more source

Aspect angle dependence of the E region irregularity velocity at large flow angles [PDF]

, 2007
We present the Doppler velocity observations of 1-m plasma waves in the auroral E region by the Scandinavian Twin Auroral Radar Experiment (STARE) Norway VHF coherent radar in the context of simultaneous and coincident measurements of electron and ion ...
Senior, Andrew, Uspensky, M., Makarevich, R. A., Koustov, A. V., Honary, Farideh, Dyson, P. L.   +5 more
core  

Meridional motions of the afternoon radar aurora, auroral electrojets, and absorption patches under variable IMF conditions [PDF]

, 2004
International audienceThe meridional motions of the CUTLASS HF and STARE VHF coherent echoes, IMAGE equivalent electrojet currents, and IRIS absorption patches during the postnoon/early-evening event of 14 February 2000 are presented.
Uspensky, M. V., M. V. Uspensky, Koustov, A. V., Makarevitch, R. A., F. Honary, Honary, F., R. A. Makarevitch, A. V. Koustov   +7 more
core   +1 more source

Estimating Rain‐Specific Attenuation at Extremely High Frequencies From Disdrometer Measurements at Various Climate Zones in the US

International Journal of Satellite Communications and Networking, Volume 44, Issue 4, Page 357-367, July/August 2026.
ABSTRACT The raindrop size distribution (DSD) plays an essential role in understanding rain attenuation effects at extremely high frequencies (EHFs). Over 1 year of DSD measurements was taken at different Köppen–Geiger climate classifications within the United States. Optical disdrometers from Thies Clima were used to measure both the size and velocity
Eugene S. Hong, George Brost, Nicholas Tarasenko, Steven A. Lane   +3 more
wiley   +1 more source

Material Property Sensitivity of Light Curve Attitude Estimation for the Lunar Trailblazer

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract The Lunar Trailblazer (LTB) spacecraft launched on 27 February 2025, toward a planned low‐lunar orbit. Eleven hours into its mission, contact with Trailblazer was lost, and recovery efforts began. Estimating the orientation and angular velocity state of Trailblazer was central for recovery to determine whether and when the vehicle could be ...
Liam Robinson, Amanda Steckel, Carolin Frueh, Bethany Ehlmann   +3 more
wiley   +1 more source

Application of S-Transform Random Consistency in Inverse Synthetic Aperture Imaging Laser Radar Imaging

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, Mingzhe Zhu, Xianda Zhou, Lu Zhong, Zijiao Tian   +4 more
doaj   +1 more source

A polarimetric Doppler radar time‐series simulator for biological applications [PDF]

, 2018
The high mobility of airborne organisms makes them inherently difficult to study, motivating the use of radars and radar networks as biological surveillance tools.
Phillip M. Stepanian, Phillip B. Chilson, Chilson, P. B., Djordje Mirkovic, Stepanian, P. M., Mirkovic, D.   +5 more
core   +1 more source

Target separation detection and motion parameter estimation method based on time-varying autoregressive model

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, Yuhao Yang, Qiang Cheng, Yanjun Hao   +3 more
doaj   +1 more source