An empirical radar backscatter model at co-polarized and cross-polarized x-band under high‐wind conditions

Yuliya I. Troitskaya; Viktor I. Abramov; Georgy A. Baidakov; Olga S. Ermakova; Daniil A. Sergeev; Alexey V. Ermoshkin; Alexander A. Kandaurov; Nikita S. Rusakov; Evgeny I. Poplavsky; Maxim I. Vdovin

doi:10.1117/12.2599885

12 September 2021 An empirical radar backscatter model at co-polarized and cross-polarized x-band under high‐wind conditions

Yuliya I. Troitskaya, Viktor I. Abramov, Georgy A. Baidakov, Olga S. Ermakova, Daniil A. Sergeev, Alexey V. Ermoshkin, Alexander A. Kandaurov, Nikita S. Rusakov, Evgeny I. Poplavsky, Maxim I. Vdovin

Author Affiliations +

Proceedings Volume 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021; 118570Q (2021) https://doi.org/10.1117/12.2599885
Event: SPIE Remote Sensing, 2021, Online Only

Conference Poster

Abstract

On the base of laboratory experiments on co- and cross-polarized microwave signal scattering on a wavy water surface, the dependences of NRCS on wind speed and friction velocity at high wind speeds were obtained. It is shown that the cross-polarized NRCS demonstrates sensitivity to the wind speed when its value is more than 20 m/s, in contrast to the co-polarized NRCS. Based on the analysis of the Doppler spectra, it was suggested that the backscattered signal is formed mainly on wave breakers. This assumption was verified by analyzing the dependence of the scattered signal power at both polarizations on the area of the white-cap coverage, which revealed their direct dependence. Based on the phenomenological approach used in statistical physics, a parametrization of the dependence of the white-cap coverage fraction on the wind friction velocity was proposed. This parametrization was based on the use of the universal Gibbs method, the central concept of which is a canonical ensemble or an ensemble of a thermodynamic system states which are in a weak thermal contact with a "thermostat". In this case, the atmospheric boundary layer acts as a thermostat, and the entire ensemble of states of the sea surface, including breakers, is the canonical ensemble. Based on this parametrization, the GMF was proposed to retrieve the wind speed and wind friction velocity for wind speeds above 40 m/s, which also considering the angular dependence of the NRCS.

Citation Download Citation

Yuliya I. Troitskaya, Viktor I. Abramov, Georgy A. Baidakov, Olga S. Ermakova, Daniil A. Sergeev, Alexey V. Ermoshkin, Alexander A. Kandaurov, Nikita S. Rusakov, Evgeny I. Poplavsky, and Maxim I. Vdovin "An empirical radar backscatter model at co-polarized and cross-polarized x-band under high‐wind conditions", Proc. SPIE 11857, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021, 118570Q (12 September 2021); https://doi.org/10.1117/12.2599885

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available