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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 6, pp. 110-115

Field studies of non-Bragg component variations of X-band radar return in the presence of surfactant films and intense long waves

I.A. Sergievskaya 1 , S.A. Ermakov 1 , A.V. Ermoshkin 1 , I.A. Kapustin 1 , O.V. Shomina 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 15.09.2020
DOI: 10.21046/2070-7401-2020-17-6-110-115
Microwave dual-polarized radars are of great interest for remote sensing of the sea surface. According to modern point of view the microwave radar return at moderate incidence angles can be considered as a combination of a Bragg component due to scattering by resonant cm-scale wind waves and a non-Bragg (nonpolarized) scattering component which is usually associated with wave breaking. At present, however, due to the lack of experimental data our understanding of the non-Bragg scattering is still insufficient to develop a quantitative model which could satisfactorily describe results of microwave probing of the sea surface. This paper presents new results of field observations of wind waves in the up- and cross-wind directions ­using a dual co-polarized X-band Doppler scatterometer at moderate incidence angles. It is found that non-Bragg scattering can be characterized by a “background” level and rare spikes, the period of which is several times larger than the period of dominant wind waves. Modification of the “background” level and the spikes in film slicks are analyzed.
Keywords: X-band radar, non-Bragg backscattering, field studies, surfactant films
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