Results 11 to 20 of about 1,405 (223)
IET Radar, Sonar & Navigation, 2023 Since solving the path of radio wave propagation by an analytic method in the process of coordinate registration (CR) for skywave over‐the‐horizon radar (OTHR) is difficult, a reference source‐aided CR method that uses ensemble learning is proposed ...
Zhenshuo Lei +5 more
doaj +3 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.
Gong, Y. H., Liu, T., Gong, Y.
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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 +6 more
doaj +2 more sources
Fuzzy Functional Dependencies as a Method of Choice for Fusion of AIS and OTHR Data [PDF]
, 2019 Maritime situational awareness at over-the-horizon (OTH) distances in exclusive economic zones can be achieved by deploying networks of high-frequency OTH radars (HF-OTHR) in coastal countries along with exploiting automatic identification system (AIS ...
Nikola Stojkovic +4 more
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Modeling the Impact of Sporadic-E on Over-the-Horizon Radar (OTHR) in the Polar Region [PDF]
Recent studies have highlighted the frequent occurrence of sporadic-E (Es) layers—thin, localized zones of enhanced electron density—especially in high-latitude and polar regions. To address this, a new statistical model for Es has been incorporated into
Chiu, Marana +2 more
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Ambiguity and area preserving linear transformations in over‐the‐horizon radar
IET Radar, Sonar & NavigationThe 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 WeatherPrior 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 +6 more
doaj +2 more sources
Hierarchical clustering for OTHR track fusion
Proceeding of 1st Australian Data Fusion Symposium, 2002 The Jindalee Operational Over-The-Horizon Radar Network has three radar stations. Targets may be detected by more than one radar. Associating multiple tracks that belong to one target presents a large operator workload. Several methods have been suggested to automate the association of tracks in pairs.
R.E. Bogner, M. Mohandes, A. Bouzerdoum
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Towards an Accuracy Bound for OTHR
2018 International Conference on Radar (RADAR), 2018 Skywave over-the-horizon radar is a sensor modality that uses refraction of radio waves through the Earth's ionosphere to observe at very long range. An OTHR system uses secondary sensors to probe the ionosphere in order to characterise propagation. The accuracy of estimated positions from OTHR depends on both the radar measurements and the system's ...
Robert Gardiner-Garden, Samuel J. Davey
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Terrain compensation for OTHR receive array
Proceedings of IEEE Antennas and Propagation Society International Symposium, 2002 The performance of an OTHR array situated on irregular terrain is presented, and the compensation of the effects of terrain irregularities is illustrated. The model used evaluates the effects of long correlation intervals on the received pattern by taking into account both the vertical terrain deformation and the effects of local ground tilt on the ...
F.H. Beltran, K. Chang
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