Results 181 to 190 of about 34,527 (227)
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7th International Conference on High Frequency Radio Systems and Techniques, 1997
HF radar groups working within separate organisations are likely to use different versions of the HF radar equation. When it is necessary to collaborate, or otherwise share know-how, there are fresh opportunities for misunderstanding. In this paper some alternative definitions of transmission loss, antenna gain and target backscattering cross-section ...
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HF radar groups working within separate organisations are likely to use different versions of the HF radar equation. When it is necessary to collaborate, or otherwise share know-how, there are fresh opportunities for misunderstanding. In this paper some alternative definitions of transmission loss, antenna gain and target backscattering cross-section ...
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1985
The development of a 26MHz pulsed Doppler radar system for remote sensing of ocean surface conditions is described. This radar obtains Doppler spectra of echoes from ocean waves within the range 10-40 km from the shore. From these Doppler spectra it is possible to estimate oceanographic parameters such as sea state, wind speed, wind direction, radial ...
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The development of a 26MHz pulsed Doppler radar system for remote sensing of ocean surface conditions is described. This radar obtains Doppler spectra of echoes from ocean waves within the range 10-40 km from the shore. From these Doppler spectra it is possible to estimate oceanographic parameters such as sea state, wind speed, wind direction, radial ...
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HF surface wave radar simulation
IEE Colloquium on Radar System Modelling, 1998One of the aims of radar performance modelling is to assess a radar's capability to fulfil its intended mission. This may be achieved by the simulation of all aspects of the radar's operation including target behaviour, environmental conditions, radar characteristics, and the radar/operator interface.
J.C. Revell, D.J. Emery
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Lagrangian coherent structures deduced from HF radar measurements
OCEANS 2015 - Genova, 2015In the present paper Lagrangian Coherent Structures are detected in the Gulf of Trieste, i.e., a Gulf located in the north-eastern part of the Adriatic Sea. Lagrangian Coherent Structures are usually detected through Lyapunov exponent diagnostic tools. However, such diagnostics lack of a rigorous mathematical background and try to associate well-known ...
ENRILE, FRANCESCO +6 more
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HF radar receiver designed for surface current radar system
10th IET International Conference on Ionospheric Radio Systems and Techniques (IRST 2006), 2006The paper presents the design methods of the HF radar receiver for the short-range Ocean State Measuring and Analyzing. The radar system adopts Frequency Modulated Interrupted Continuous Waveform (FMICW) and operates at 12∼14MHz. The receiver has only once mixing and band-pass sampling structure.
null Shen Wei +5 more
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Surface wave HF radar simulator
Radar Systems (RADAR 97), 1997A computer code is described which has been developed for the simulation of surface wave high frequency (SW-HF) radar. The aim is to investigate the problems related to the detection and tracking of surface targets at beyond the horizon ranges. In SW-HF radar target detection involves stochastic features such as target RCS fluctuations, atmospheric ...
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Ionospheric probing with an HF radar
Electronics & Communication Engineering Journal, 1989The Jindalee over-the-horizon (OTH) radar is designed primarily for extended air defence surveillance of Australia's northern coastline. It achieves its long-range capability by employing ionospheric reflection. This use of the ionosphere allows the radar to have a powerful secondary role in remote sensing because information about the ionosphere can ...
M.L. Lees, R.M. Thomas
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2011 IEEE/OES 10th Current, Waves and Turbulence Measurements (CWTM), 2011
This paper briefly reviews the theory behind wave measurement with HF radar. Data from a number of different deployments with different radars, at different frequencies, in different oceanographic conditions are used to demonstrate the wave mapping capability and to illustrate some of the problems that have arisen and solutions that have been ...
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This paper briefly reviews the theory behind wave measurement with HF radar. Data from a number of different deployments with different radars, at different frequencies, in different oceanographic conditions are used to demonstrate the wave mapping capability and to illustrate some of the problems that have arisen and solutions that have been ...
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HF radar optimised for tsunami monitoring
OCEANS 2015 - Genova, 2015Recent reports have shown high-frequency (HF) radar measurements of tsunami signatures as the disturbance propagates from deep water to shallow water across the edge of the continental shelf. Most HF radars are optimised in various ways to measure seasonal circulation, tidal currents or sub-tidal structures.
Mal Heron +2 more
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HF Radar and Auroral Absorption
Radio Science, 1970A description is given of a method, based on riometer observations, for the calculation of auroral absorption of HF radio waves propagating over high‐latitude paths. Emphasis is on HF radar, but the method is appropriate for use in predicting circuit performance of high‐latitude HF communications.
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