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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. 4, pp. 69-80

Pulsed sonar for sea wave parameters retrieval — Part 2: Numerical simulation and retrieval algorithm

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: 20.07.2023
DOI: 10.21046/2070-7401-2023-20-4-69-80
Even though the experiment is the most important stage of scientific research in testing the hypotheses and the developed models, the possibility of carrying out 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, a numerical experiment makes it possible to assess the reliability of the theoretical models used, the accuracy of processing algorithms, to determine the optimal measurement scheme and the parameters of the sonar. 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). For the theoretical description of the shape of the reflected pulse in the previous part of the work, two analytical models were used: the Brown model and the Karaev model. This part of the work is devoted to the numerical modeling of the reflection of acoustic waves of the water surface in the quasi-specular reflection region. The operation of an underwater acoustic wave gauge with wide antenna patterns in two ranges of radiated wavelengths of 8 mm and 23 cm is simulated. Comparison of the impulses “measured” in the experiment with those obtained using the theoretical formula confirmed the efficiency of the developed retracking algorithm using the theoretical model of the Karaev impulse.
Keywords: quasi-specular scattering, numerical simulation, reflected pulse shape, sonar, significant wave height, variance of large-scale slopes, processing algorithms, retracking
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