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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. 6, pp. 73-84

A new algorithm for determining mean square slopes of sea waves: a theoretical approach

V.Yu. Karaev 1 , M.A. Panfilvoa 1 , M.S. Ryabkova 1 , Yu.A. Titchenko 1 , X. Li 2 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, China
Accepted: 07.12.2021
DOI: 10.21046/2070-7401-2021-18-6-73-84
At present, there are radars in near-Earth orbit that measure the backscatter radar cross section at small incidence angles, when the quasi-speqular backscatter mechanism is dominant. It is known that from the dependence of the backscattering radar cross section on the incidence angle measured by precipitation radars installed on the TRMM and GPM satellites, the mean square slopes of large-scale, in comparison with the radar wavelength, waves along the sounding direction is determined. In 2018, the France-China satellite CFOSAT was launched into orbit on board of which the Chinese scatterometer RFSCAT and the French spectrometer SWIM were placed. Due to the features of the measurement scheme, SWIM for the first time performs measurements of the backscatter radar cross section at small incidence angles at different azimuthal angles. In this study, a new approach to measuring the mean square slopes (mss) of large-scale waves is considered, which for the first time uses the azimuthal dependence of the backscatter radar cross section at one incidence angle. In the developed retrieval algorithm, the input parameters are the backscattering radar cross sections at different azimuthal angles, but at the same incidence angle, and the backscattering radar cross section at zero incidence angle. The processing procedure consists of two stages. At the first stage, the coefficients of the model are calculated, which describe the azimuthal dependence of the backscattering radar cross section. At the second stage of processing, the model is used to calculate the backscatter radar cross section for azimuthal angles of 0 and 90°, which makes it possible to determine the total variance of large-scale wave slopes using analytical formulas. Test processing of SWIM data has confirmed the efficiency of the proposed approach.
Keywords: : mean square slopes of large-scale in comparison with radar wavelength, sea wave, backscattering radar cross section, small incidence angles, spectrometer SWIM, retrieval algorithms
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