Results 251 to 260 of about 17,764,059 (293)
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High-Frequency Skywave Radar Measurements of Hurricane Anita
Science, 1980We tracked and monitored hurricane Anita over a 5-day period by using the SRI-operated Wide Aperture Research Facility (WARF) high-frequency skywave radar. The WARF-derived positions for Anita agreed to within ± 19 kilometers of the coincident temporal positions along the National Hurricane Center's smooth track.
J W, Maresca, C T, Carlson
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High-Frequency Radar Observations of Ocean Surface Currents
Annual Review of Marine Science, 2013This 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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High Frequency Over-the-Horizon Radar
2019 IEEE Radar Conference (RadarConf), 2019Presents 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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Observation Of Typhoon Meranti With High Frequency Radar System
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019The 2016 Meranti typhoon was observed with two land-based high frequency radars when it passed through the Taiwan Strait before landing. The HF radar works at 7.9MHz with Bragg wave frequency of 0.29 Hz higher than typical spectrum peak frequency of typhoon generated wave.
Heng Zhou 0005 +2 more
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National high frequency radar network: Update
OCEANS 2009, 2009One 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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The synthetic aperture radar in high frequency band
5th International Conference on Antenna Theory and Techniques, 2005., 2005The 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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Waveform analysis for high-frequency FMICW radar
IEE Proceedings F Radar and Signal Processing, 1991The paper describes the waveform analysis for an experimental long-range highfrequency radar system with a design capability for over-the-horizon detection of ocean surface targets up to 400 km from shore with a range resolution of 400 m. Motivated by the need to maximise the transmitter duty cycle in order to detect long-range targets, the radar is ...
R.H. Khan, D.K. Mitchell
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Seawater Antenna for High-Frequency Surface Wave Radar
2019Liquid 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, 1988Abstract 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, 2009Suffering 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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