Analytical Techniques for the Doppler Signature of Sea Surfaces in the Microwave Regime-II: Nonlinear Surfaces

Type Article
Date 2011-12
Language English
Author(s) Nouguier FredericORCID1, Guerin Charles-Antoine3, Soriano Gabriel2
Affiliation(s) 1 : IFREMER, Lab Oceanog Spatiale, F-29280 Plouzane, France.
2 : Univ Aix Marseille 3, Inst Fresnel, Ctr Natl Rech Sci, Unite Mixte Rech 6133, F-13013 Marseille, France.
3 : Univ Sud Toulon Var, Lab Sondages Electromagnet Environm Terr, Geosci & Remote Sensing Dept, Ctr Natl Rech Sci,Unite Mixte Rech 6017, F-83957 La Garde, France.
Source Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Ieee-inst Electrical Electronics Engineers Inc), 2011-12 , Vol. 49 , N. 12 , P. 4920-4927
DOI 10.1109/TGRS.2011.2153207
WOS© Times Cited 32
Keyword(s) Doppler spectrum, microwave, nonlinear gravity waves, remote sensing, rough surfaces, scattering, sea surface
Abstract This paper extends the results of a previous work by combining hydrodynamic and electromagnetic analytical models for the simulation of the ocean Doppler spectrum at microwave frequencies. We consider weakly nonlinear sea surfaces after the choppy wave model and incorporate them in classical and unified scattering models, namely, the Kirchhoff and weighted curvature approximations. We show that statistical expressions can be obtained for the Doppler spectrum in a way similar to the case of linear surfaces. As expected, the nonlinear nature of the sea surface dramatically impacts the Doppler spectrum at moderate to large incidence angles, with a shift of the central frequency and a broadening of the spectrum. Monte Carlo comparisons are performed with the Creamer model, which is frequently used to describe weakly nonlinear sea surfaces but does not enjoy a statistical formulation for the Doppler characteristics. The same qualitative behavior is found but some quantitative differences are found and discussed.
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