Results 31 to 40 of about 134,102,892 (221)

An evaluation of range accuracy in the Super Dual Auroral Radar Network over-the-horizon HF radar systems

, 2001
The Super Dual Auroral Radar Network (SuperDARN) of over-the-horizon HF radars forms a powerful diagnostic of large-scale ionospheric and magnetospheric dynamics in the Northern and Southern Hemispheres.
Tim K. Yeoman (7583066), D. M. Wright (7583069), A. J. Stocker (7583006), T. B. Jones (2721313)   +3 more
core   +6 more sources

A Cognitive Beamforming Method via Range-Doppler Map Features for Skywave Radar

Remote Sensing, 2022
For skywave over-the-horizon radar, beamforming techniques are often used to suppress airspace radio frequency interference because the high-frequency band is shared by many devices.
Zhenshuo Lei, Hui Chen, Zhaojian Zhang, Gaoqi Dou, Yongliang Wang   +4 more
doaj   +1 more source

Initial results from an experimental skew-fire Mode-Selective over-the-horizon-radar

, 2014
The use of skywave over-the-horizon radar for the detection and tracking of ships is significantly more challenging than the equivalent task for aircraft.
Frazer, G.J., Y. I. Abramovich, Abramovich, Y., Heitmann, A., G. J. Frazer, A. J. Heitmann   +5 more
core   +1 more source

Performance Comparison between Deep Learning and Optical Flow-Based Techniques for Nowcast Precipitation from Radar Images

Forecasting, 2020
In this article, a nowcasting technique for meteorological radar images based on a generative neural network is presented. This technique’s performance is compared with state-of-the-art optical flow procedures.
Marino Marrocu, Luca Massidda
doaj   +1 more source

The structure of the construction of a radar receiver for over-the-horizon detection [PDF]

EPJ Web of Conferences
The article provides information on the tasks of the over-thehorizon detection system, provides brief information on over-the-horizon radars of Russia. The foreign experience of building over-the-horizon detection systems is analyzed.
Litvinov Svyatsolav, Khamkin Nikita, Nanay Farida   +2 more
doaj   +1 more source

OVER –THE - HORIZON RADAR (OTHR) UNTUK MENJAGA WILAYAH UDARA DAN LAUT INDONESIA [PDF]

, 2018
Menjaga kedaulatan NKRI merupakan salah satu tugas pokok TNI seperti tercantum dalam Undang-Undang Nomor 3 tahun 2002 tentang Pertahanan Negara dan Undang-Undang Nomor 34 tahun 2004 tentang TNI.  Untuk menjadi tentara profesional seperti tercantum dalam
Yudhistira, Andi
core   +1 more source

A Global Methane Observation System to Reduce Uncertainty for Anthropogenic and Natural Sources and Sinks for Detecting and Attributing Climate Feedbacks

Advanced Science, EarlyView.
Conceptual illustration of a Global Ecosystem Methane Observing System (GEM‐OS) integrating satellites, aircraft, atmospheric networks, and ecosystem measurements to quantify methane emissions from anthropogenic and natural sources. The multi‐scale observing framework improves source attribution, reduces uncertainty in regional methane budgets, and ...
P. Ciais, S. Peng, J. Chang, F. Li, Q. Zhu, K. Yuan, G. Hugelius, H. Li, Y. Cai, F. Chevallier, K. Tibrewal, E. A. Kort, K. Arndt, J. Watts, B. Buma, N. Besic, P. I. Palmer, H. Cadillo‐Quiroz, E. Euskirchen, M. J. Gondwe, A. Hoyt, R. Jackson, S. Malone, D. Monteverde, S. Natali, M. Ramonet, C. Rey‐Sanchez, L. B. Sagang, E. A. G. Schuur, R. Vargas, R. Varner, Z. Zhang, B. Poulter   +32 more
wiley   +1 more source

Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective

Advanced Electronic Materials, EarlyView.
Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Vincenzo Galdi   +4 more
wiley   +1 more source

A CFAR Detector Based on a Robust Combined Method With Spatial Information and Sparsity Regularization in Non-Homogeneous Weibull Clutter

IEEE Access, 2018
In over-the-horizon radar (OTHR), atmospheric noise and sea clutter exist in different regions of Range-Doppler map. To improve the detection performance, a combined method is proposed to identify the cell-under-test (CUT) and estimate the parameters of ...
Yang Li, Longshan Wu, Ning Zhang
doaj   +1 more source

A Modified Sequential Multiplexed Method for Detecting Airborne and Sea Targets With Over-the-Horizon Radar

IEEE Access, 2020
Phased array over-the-horizon (OTH) radar usually needs to detect sea target and airborne target in different directions. Conventionally, the sea target and airborne target are detected sequentially with the coherent integration completely accomplished ...
Zhaoyi Wang, Shengnan Shi, Ziyang Cheng, Zishu He   +3 more
doaj   +1 more source