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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, 2024, Vol. 21, No. 6, pp. 309-319

Field studies of the third Stokes parameter angular dependences of sea surface radiation at a frequency of 37 GHz

D.S. Sazonov 1 , I.N. Sadovsky 1 , А.V. Kuzmin 1 , E.V. Pashinov 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 18.11.2024
DOI: 10.21046/2070-7401-2024-21-6-309-319
In this paper, we analyze new experimental measurements of azimuthal variations in microwave radiation from a rough water surface. The experimental data were obtained using microwave radiometers with operating frequency of ~37 GHz (wavelength ~8 mm) at the oceanographic platform in the Black Sea (Hydrophysical Polygon RAS) from September 19 to October 6, 2023. Measurements of azimuthal dependences (in the range from 73 to 251°) were carried out at angles of 10, 25, 40, 55, 65° from nadir. From the entire set of experimental data, only those that corresponded to a stable wind direction at speeds greater than 10 m/s were selected. The value of the third Stokes parameter was calculated as the difference in brightness temperatures obtained at polarizations rotated by +45 and –45° relative to the vertical. An external calibration operation was preliminarily performed for the radiation of the black body and the radiation of the sky. The anisotropy angle was calculated as the difference between the wind direction (measured by the meteorological complex) and the viewing direction. The obtained angular dependences were compared with the radiation transfer model used in the analysis of satellite measurements. It is shown that the measured azimuthal dependences of the third Stokes parameter are described within the framework of the model approximation only partially. As the main reason for the observed discrepancies one should indicate significant limitations of the specified model under conditions of undeveloped waves. The results of the experiment will enrich the database used to modernize the two-scale radiation formation model developed at the IKI RAS.
Keywords: azimuthal anisotropy, experiment, remote sensing, radio brightness temperature, microwave radiation, modeling, MTVZA-GYa
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