Real aperture radar imaging of ocean waves during SAXON-FPN: A case of azimuth-traveling waves
| Autor: | W. C. Keller, F. Askari |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Synthetic aperture radar
Atmospheric Science Aperture Soil Science Sea state Aquatic Science Oceanography Wind speed law.invention Optics Geochemistry and Petrology law Radar imaging Wind wave Earth and Planetary Sciences (miscellaneous) Radar Physics::Atmospheric and Oceanic Physics Earth-Surface Processes Water Science and Technology Remote sensing Physics Ecology business.industry Paleontology Forestry Azimuth Geophysics Space and Planetary Science business |
| Zdroj: | Journal of Geophysical Research. 99:9817 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/93jc01903 |
| Popis: | This paper investigates the radar imaging of ocean waves under two separate wind speed and sea state conditions using an X band real aperture radar (RAR). It is shown experimentally that for the case of higher sea state and wind speed (9.1 m/s), the RAR is capable of imaging the waves from all directions including the azimuth. The case for low sea state and wind speed (4.5 m/s), however, shows somewhat stronger imaging contrast in the range direction with reduced contrast for the azimuth-traveling waves. The results of the aircraft observations are compared with numerical simulations of a RAR imaging model. Simulations show that cross tilt is a viable mechanism for enhancing the azimuthal modulations, but the results are sensitive to the level of upwind/cross-wind anisotropy of the shortwave spectrum. Simulations also show that the variations in incidence angle create irregularities in the azimuthal angle distribution. |
| Databáze: | OpenAIRE |
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