Results 11 to 20 of about 1,166 (180)

Transient Interference Excision and Spectrum Reconstruction with Partial Samples Using Modified Alternating Direction Method of Multipliers-Net for the Over-the-Horizon Radar [PDF]

Sensors
Transient interference often submerges the actual targets when employing over-the-horizon radar (OTHR) to detect targets. In addition, modern OTHR needs to carry out multi-target detection from sea to air, resulting in the sparse sampling of echo data ...
Zhang Man, Quan Huang, Jia Duan
doaj   +3 more sources

Experimental Study on Shortwave Communication and OTHR Integrated System Based on OFDM Waveform

Leida xuebao, 2012
Based on the recently developed active-passive multifunctional all-digital HF surface wave radar hardware platform of Wuhan University, an experiment study of integrated technology for shortwave communication and Over-The-Horizon Radar (OTHR) application
Shao Qi-hong, Wan Xian-rong, Zhang De-lei, Zhao Zhi-xin, Ke Heng-yu   +4 more
doaj   +2 more sources

OTHR Spectrum Reconstruction of Maneuvering Target with Compressive Sensing [PDF]

International Journal of Antennas and Propagation, 2014
High-frequency (HF) over-the-horizon radar (OTHR) works in a very complicated electromagnetic environment. It usually suffers performance degradation caused by transient interference.
Yinghui Quan, Lei Zhang, Yachao Li, Hongxian Wang, Mengdao Xing   +4 more
doaj   +2 more sources

OTHR Impulsive Interference Suppression in Strong Clutter Background

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2009
External interferences can severely degrade the performance of an Over-the-horizon radar (OTHR), so suppression of external interferences in strong clutter environment is the prerequisite for the target detection. The traditional suppression solutions usually began with clutter suppression in either time or frequency domain, followed by the ...
LIU, Tao, GONG, Yu, GONG, Yaohuan
openaire   +2 more sources

Two‐Way Assessment of Ionospheric Maps Performance Over the Brazilian Region: Global Versus Regional Products

Space Weather, 2023
Vertical total electron content (VTEC) has great importance in describing the ionosphere. VTEC values are commonly distributed in regular grids by means of so‐called global ionospheric maps (GIMs) and regional ionospheric maps (RIMs).
Gabriel O. Jerez, Manuel Hernández‐Pajares, Andreas Goss, Fabricio S. Prol, Daniele B. M. Alves, João F. G. Monico, Michael Schmidt   +6 more
doaj   +2 more sources

Ambiguity and area preserving linear transformations in over‐the‐horizon radar

IET Radar, Sonar & Navigation
The use of recurrent waveforms in over‐the‐horizon radar (OTHR) necessitates techniques for ambiguity resolution and manipulation. This paper provides a number of techniques for manipulating the shape of radar ambiguity functions.
Stephen D. Howard, Van Khanh Nguyen
doaj   +2 more sources

On the Use of SuperDARN Ground Backscatter Measurements for Ionospheric Propagation Model Validation

Space Weather
Prior to use in operational systems, it is essential to validate ionospheric models in a manner relevant to their intended application to ensure satisfactory performance.
Joshua J. Ruck, David R. Themens, Pasha Ponomarenko, Angeline G. Burrell, Bharat Kunduri, J. Michael Ruohoniemi, Sean Elvidge   +6 more
doaj   +2 more sources

OTHR-09 EPIDEMIOLOGY OF BRAIN TUMORS IN ZIMBABWE [PDF]

Neuro-Oncology Advances
Abstract OBJECTIVE Brain tumors, while rare, cause significant morbidity and mortality across all ages. This study was done to help understand the age and sex distribution of the common brain cancers diagnosed in Zimbabwe.
Chingonzo, Kuzivakwashe, Kalangu, Kazadi, Zimani, Nathaniel, Dzowa, Maximilian   +3 more
openaire   +2 more sources

Effect of Frequency Monitoring System for Over-The-Horizon Radar due to the presence of patches and arcs within the polar cap ionosphere

, 2020
High frequency Over-the-Horizon Radar (OTHR)provides an economical means to track non-cooperative airtargets over large expanses of land and ocean.
Alan Stocker, David Siddle, Alan J Stocker (9875672), Michael Warrington, David R Siddle (9875675), Thayananthan Thayaparan, E Michael Warrington (9875669), Thayananthan Thayaparan (9875666)   +7 more
core   +7 more sources

Simulation of the effect of convecting patches of enhanced electron density on HF Over-The-Horizon Radars (OTHRs) in the polar regions

, 2021
High frequency Over-the-Horizon Radars (OTHR)provide an economical means to detect and track non-cooperativeair targets over large expanses of land and sea.
Alan J Stocker (9875672), David R Siddle (9875675), E Michael Warrington (9875669), Thayananthan Thayaparan (9875666)   +3 more
core   +6 more sources