ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 1, pp. 58-68

Evaluation of the boundary wave number for the two-scale model of the sea surface in Ka- and Ku-bands using the dual-frequency precipitation radar data

M.A. Panfilova 1 , V.Yu. Karaev 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 14.12.2016
DOI: 10.21046/2070-7401-2017-14-1-58-68
The boundary wave number which separates large-scale (compared to the probing wave length) part of sea spectrum from the small-scale is important in the analysis of microwaves backscatter from the sea surface and comparison with theoretical calculations. An approximate evaluation of the boundary wave number is usually made and it does not depend on the sea state and wind speed. The dual-frequency precipitation radar (DPR) scans the sea surface at low incidence angles in Ka- and Ku-bands and has a wide swath which allows one to obtain the slope variance of large-scale waves along the scanning direction. Database containing radar and sea buoys data on wind speed and parameters of waves was formed. The dependencies of slope variance of large-scale waves for Ka- and Ku-band on wind speed were obtained. This result was used to calculate the dependence of the boundary wave number on the wind speed in case of fully developed sea wave.
Keywords: radar sensing of the sea surface, slope variance of sea waves, spectrum, boundary wave number
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