منابع مشابه
Measurement of ocean wave height and direction by means of HF radar: an empirical approach
High-frequency (HF) radars have been used since 20 years for remotely sensing ocean surface currents and ocean waves. Backscattered Doppler spectra contain two discrete lines, the frequencies of which (Bragg frequency) determine the current speed, and four continuous side bands, which allow to apply inversion techniques for retrieving ocean wave spectra. Recently, a new HF radar has been develo...
متن کاملA Model for Wind Speed and Wave Height Retrieval from Radar Altimeter Measurements
A numerical algorithm is here proposed to simulate the measurement of ocean wave height and wind speed by radar altimeter. The algorithm takes into account a realistic ocean wave spectrum and employs a parametric sub-model to simulate the electromagnetic waves scattering from the surface, thus providing greater flexibility and realism than the analytical models currently used. The model is show...
متن کاملWave Height Estimation from Shipborne X-Band Nautical Radar Images
A shadowing-analysis-based algorithm is modified to estimate significant wave height from shipborne X-band nautical radar images. Shadowed areas are first extracted from the image through edge detection. Smith’s function fit is then applied to illumination ratios to derive the root mean square (RMS) surface slope. From the RMS surface slope and the mean wave period, the significant wave height ...
متن کاملUse of ‘velocity projection’ to estimate the variation of sea-surface height from HF Doppler radar current measurements
The technique of ‘velocity projection’ (J. Geophys. Res. 106 (2001) 6973) is used to estimate the sea-surface height field and its change over time from measurements of surface velocity made using a shore-based HF Doppler radar over a 30 30-km region of the continental shelf located near the mouth of the Chesapeake Bay (USA). Projected current profiles are compared with measured currents from a...
متن کاملHistory, Present Status, and Fu HF Surface-Wave Radar
HF surface-wave radars (HFSWRs) offer two distinct advantages when used over the sea: with vertical polarization, they see beyond the horizon, and the interaction of their signals with ocean waves is simple and well understood. As a result, many HFSWR research test programs were conducted in the U.S., beginning 35 years ago. This author was fortunate to have been immersed in these programs from...
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ژورنال
عنوان ژورنال: Oceanography
سال: 1997
ISSN: 1042-8275
DOI: 10.5670/oceanog.1997.32