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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, 2023, Vol. 20, No. 3, pp. 49-58

Pulsed sonar for sea wave parameters retrieval — Part 1: Theoretical models

K.A. Ponur 1 , Yu.A. Titchenko 1 , V.Yu. Karaev 1 , M.S. Ryabkova 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 03.05.2023
DOI: 10.21046/2070-7401-2023-20-3-49-58
Despite the fact that the experiment is the most important stage of scientific research when testing hypotheses and developed models, the possibility of conducting numerical experiments significantly speeds up the process of their verification. Even more popular is the use of numerical simulation at the stage of development, manufacture and testing of a new device. In this case, the numerical experiment makes it possible to evaluate the reliability of the theoretical models used, the accuracy of the processing algorithms, to determine the optimal measurement scheme and, in this case, the sonar parameters. To obtain new information about surface waves, it is proposed to use a multi-frequency underwater acoustic wave gauge and its efficiency can be estimated using numerical simulation (numerical experiment). To describe the shape of the reflected pulse, two analytical models were used: the Brown model and the Karaev model. For the first time, a comparison of the models showed their difference for sonar with a wide antenna pattern. Significant differences in the behavior of the trailing edge of the reflected pulse are because the slope variance of the scattering surface is not included in the Brown model. For the first time, the influence of the radiation wavelength on the shape of the reflected pulse is shown, which will make it possible to use multifrequency systems to measure the intensity of the short-wavelength part of the wave spectrum.
Keywords: quasi-specular scattering, Kirchhoff approximation, scattering of waves on a rough surface, shape of the reflected pulse, sonar, significant wave height, slope variance of large-scale waves, processing algorithm
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