Results 121 to 130 of about 30,701 (161)

High Frequency Over-the-Horizon Radar

2019 IEEE Radar Conference (RadarConf), 2019
Presents a collection of slides covering the following topics: high frequency over-the-horizon radar; HF channel model; time-varying adaptive beamforming; space-time adaptive processing; GLRT detection schemes; HF passive radar; blind signal separation; multipath-driven geolocation and MIMO OTHR concept.
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High-Frequency Radar Observations of Ocean Surface Currents

Annual Review of Marine Science, 2013
This article reviews the discovery, development, and use of high-frequency (HF) radio wave backscatter in oceanography. HF radars, as the instruments are commonly called, remotely measure ocean surface currents by exploiting a Bragg resonant backscatter phenomenon.
Jeffrey D, Paduan, Libe, Washburn
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The synthetic aperture radar in high frequency band

5th International Conference on Antenna Theory and Techniques, 2005., 2005
The possibilities of the synthetic aperture radar construction in high frequency (HF) band are analyzed. The fields of application of such radar are considered.
A.V. Polyarus, D.V. Karlov
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Perspectives of the use of high frequency radars on buoys

Europe Oceans 2005, 2005
High Frequency Surface Wave Radar (HFSWR) is an alternative to conventional microwave radar. It allows to detect boats at long distance, far beyond the horizon. As this type of radar, which works typically at 3 to 30 MHz, have long wavelength (>10m), their antennas take up a very large room.
A. Bourges, R. Guinvarc'h
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Aircraft detection and tracking with high frequency radar

Proceedings International Radar Conference, 2002
Northern Radar Systems Limited has built a high frequency ground wave radar at Cape Race, Newfoundland, for over-the-horizon (OTH) detection of targets. Operational experience with the radar has demonstrated that this technology has significant potential for all weather, cost-effective surveillance of large coastal areas.
R.H. Khan, D. Power
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National high frequency radar network: Update

OCEANS 2009, 2009
One of the primary efforts for the NOAA Integrated Ocean Observing System (IOOS®) Program office is the development of a national high frequency radar (HFR) network for measuring ocean surface currents throughout the coastal United States. After experiencing rapid growth for several years, the number of HF radars deployed in the United States is now ...
Jack Harlan, Eric Terrill, Bill Burnett
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Seawater Antenna for High-Frequency Surface Wave Radar

2019
Liquid antennas can be easily reconfigured, which means that the antennas can work at different frequency by adjusting the height of liquid surface. This paper presents that seawater antennas can be used in high-frequency surface wave radar. First, performance of seawater antennas is analyzed using Ansys HFSS.
Linwei Wang, Changjun Yu, Haorong Wang
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Response of high frequency radar to meteor backscatter

Journal of Atmospheric and Terrestrial Physics, 1988
Abstract The response of a High Frequency (HF) Radar System to echoes backscattered from underdense meteor trails is calculated. Three propagation modes are identified according to whether the echo is received along the direct (line-of-slight) path, or along two possible paths from beyond the horizon involving ionospheric reflection.
R.M. Thomas, P.S. Whitham, W.G. Elford
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Detection scene analysis for high frequency radar

2009 IEEE Youth Conference on Information, Computing and Telecommunication, 2009
Suffering from multiform time-variant and fluctuant clutter in High Frequency Radar(HFR), uniform target detection, tracking and clutter mitigation methods will result in false alarm or missing alarm. To select optimized detection and clutter mitigation method in the region of interesting, a method maximizing the separability of the resultant classes ...
Yang Li, Ning Zhang, Qiang Yang
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Evaluation of high frequency radar wave measurement

Coastal Engineering, 1999
Abstract The spatial coverage, temporal availability and spectral and parameter accuracy of wave measurements using radars operating at the upper end of the high frequency (HF) radio band are discussed. The two radars used are the Ocean Surface Current Radar (OSCR) developed in the UK and the Wellen Radar (WERA) developed in Germany. The measurements
L.R Wyatt, S.P Thompson, R.R Burton
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