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| Titel: |
Non-linear features related to the dual-frequency technique in maritime applications |
| Auteur: |
Jacobsen, S. Eltoft, T. |
| Verschenen in: |
International journal of remote sensing |
| Paginering: | Jaargang 13 (1992) nr. 17 pagina's 3329-3348 |
| Jaar: |
1992-11-01 |
| Inhoud: |
Field measurements of non-linear characteristics, related to the dual-frequency technique applied to the ocean surface, were carried out in the North Sea. The data observations were made with a CW multi-frequency C-band radar onboard the offshore research platform 'Forschungsplattform Nordsee'. It is verified that the cross-product spectrum contains additional information on distinct non-linear features, when compared to existing theories previously published in the literature. In particular, a relatively sharp second order Bragg resonance line is found on the right-hand side of the pronounced first order peak. This Doppler line occurs, within error bars, in the spectrum at √2 times the first order resonance frequency To substantiate this observational feature two alternative models are presented which separately describe non-linear hydrodynamical and scattering mechanisms. Both models are based on a locally homogeneous and stationary ripple wave field. The results from the field experiment have been examined and found to provide firm evidence supporting both proposed models. Furthermore, for longer matched wavelengths (typically > 17 m) energetic lines with very small Doppler shift (<0·1 Hz) were observed. This slowly propagating phenomenon is empirically deduced to be associated with wave group structures. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 170 van 268 gevonden artikelen
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