Results 71 to 80 of about 9,489 (235)

The Turbulence Properties of 150‐km Echoes in the Lower Ionosphere

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The valley region ionosphere spans from approximately 120–200 km in altitude, and hosts a wide range of plasma, neutral, and solar interactions that create and maintain the ionosphere. In this region a ubiquitous and mysterious source of radar echoes called “150‐km echoes” has been observed since the 1960s.
William J. Longley, Lindsay V. Goodwin, Chirag R. Skolar, Nicholas M. Pedatella   +3 more
wiley   +1 more source

Detection Capability Improvement of High PRF FM Ranging Airborne Radar with Clutter Rejection [PDF]

Journal of Electromagnetic Engineering and Science
In this paper, the clutter rejection threshold corresponding to the maximum Doppler frequency of mainlobe clutter in high pulse repetition frequency airborne radar with frequency modulation (FM) ranging is proposed.
Ji Hwan Yoon, Jin Ju Won, Ji Eun Roh
doaj   +1 more source

Analysis of Clutter for Passive Radar on Moving Platforms Using Tunable Q-factor Wavelet Transforms

, 2022
S.855-863Passive radar systems on moving platforms suffer from Doppler-spread clutter that can mask moving targets of interest. Moreover, platform size restrictions further limit the number of antenna channels, which are needed to ameliorate the impacts ...
Wojaczek, Philipp, Duk, Vichet, O'Hagan, Daniel W., Cristallini, Diego   +3 more
core   +1 more source

Multi‐LiDAR Observations of Coastal Atmospheric Duct Evolution in Hampton Roads

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.
Abstract To better understand the influence of atmospheric ducts on radio frequency (RF) operations, continuous high‐resolution observations of temperature and water vapor are essential. Hampton University's (HU) 48‐inch Raman‐Mie LiDAR provides such measurements through rotational and vibrational Raman techniques, enabling detailed monitoring of ...
Jia Su, Melvin A. Felton Jr., Ruben Delgado, David A. Ligon, Deryk James   +4 more
wiley   +1 more source

A Weather Radar Ground Clutter Suppression Method Using Adaptive Coherent Pulse Integration

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Ground clutter poses a significant challenge to the accuracy of weather radar products, especially for aeroecology monitoring. Operational weather radar commonly employs a fixed coherent pulse integration (CPI) for clutter suppression.
Rui Wang, Huafeng Mao, Kai Cui, Zujing Yan, Yunlong Li, Dongli Wu, Cheng Hu   +6 more
doaj   +1 more source

Radar Clutter Backscattering Simulation for Specific Sites

, 2007
The state of development of the surface clutter prediction model DORTE is presented. This simulation program utilizes Digital Elevation Models and land use information to calculate reflectivity maps for specific sites with optional statistical variation ...
Rode, Gerald
core  

Numerical study on signatures of atmospheric convective cells in radar images of the ocean

, 1999
Current and wind variations at the ocean surface can give rise to a modulation of the sea surface roughness and thus become visible in radar images. The discrimination between radar signatures of oceanic and atmospheric phenomena can be quite difficult ...
Susanne Ufermann, Ufermann, S., Roland Romeiser, Romeiser, Roland, Ufermann, Susanne, Romeiser, R.   +5 more
core   +1 more source

Performance Evaluation of Two Multistatic Radar Detectors on Real and Simulated Sea-Clutter Data [PDF]

, 2018
In this paper we evaluate the performance of two multistatic radar detection schemes on real and synthetically-generated sea clutter data. The analysis utilizes both monostatic and bistatic radar data, simultaneously collected by the nodes of the N etRAD
Rosenberg, L, Palamá, R, Griffiths, H, Luke Rosenberg, Riccardo Palama, Hugh Griffiths   +5 more
core   +1 more source

Infrared‐Microwave Compatible Stealth Transparent Metasurface With Digital Camouflage and Hybrid Absorption‐Scattering

Nanophotonics, Volume 15, Issue 12, 25 June 2026.
Traditional metasurfaces suffer from the drawbacks of pure microwave absorption and low IR emissivity stealth, namely failing to match complex ambient backgrounds with varying IR emissivity and generating excess heat accumulation (enhanced IR thermal radiation).
Dan Liu, Yanzhao Wang, Kefeng Ji, Huanhuan Gao, Sihong Zhou, Tong Liu, He‐Xiu Xu   +6 more
wiley   +1 more source

Evaluation of Surface Clutter for Future Geostationary Spaceborne Weather Radar

Atmosphere, 2017
Surface clutter interference will be one of the important problems for the future of geostationary spaceborne weather radar (GSWR). The aim of this work is to provide some numerical analyses on surface clutter interference and part of the performance ...
Xuehua Li, Jianxin He, Chuanzhi Wang, Shunxian Tang, Xiaoyu Hou   +4 more
doaj   +1 more source