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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, 2021, Vol. 18, No. 3, pp. 229-241

Backscattering of microwave radar signal by first year sea ice at small incidence angles

V.Yu. Karaev 1 , M.A. Panfilova 1 , L.M. Mitnik 1, 2 , M.S. Ryabkova 1 , Yu.A. Titchenko 1 , E.M. Meshkov 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 V.I. Il'ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia
Accepted: 06.04.2021
DOI: 10.21046/2070-7401-2021-18-3-229-241
The complexity of developing a theoretical model for microwave scattering is due to the fact that sea ice is a multicomponent medium with special electrophysical and physicochemical properties. At small incidence angles, the problem is further complicated by the fact that there are very few experimental data, which complicates the verification of the models. Launching the GPM (Global Precipitation Measurement) satellite with a Dual-frequency Precipitation radar (Ku and Ka bands), which performs measurements at small incidence angles (0–18), opens up opportunities for verifying existing models and building new ones. The Sea of Okhotsk was chosen as a test object, which falls within the observed area of the Dual-frequency Precipitation Radar. We studied the dependence of backscattering radar cross section on the incidence angle for the first year ice cover at negative air temperatures (dry ice). Comparison of experimental dependences with three scattering models showed that the best agreement with measurements is obtained by the perturbation method for a flat rough surface. For the spectrum of effective roughness used in the model, it is proposed to use a power function, and the exponent –1.3 turned out to be optimal for both radar wavelengths. However, the question of the amplitude of the spectrum requires additional research.
Keywords: Dual-frequency precipitation radar, small incidence angles, backscatter radar cross section, ice cover, processing algorithms
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