Near-shore nonlinear sinusoidal microwave scattering characteristic analysis method

Abstract

The invention belongs to the technical field of ocean scattering echo analysis, and discloses a near-shore nonlinear sinusoidal wave microwave scattering characteristic analysis method, which comprises the following steps of: firstly, modeling near-shore environment nonlinear sea waves by adopting a simple and representative sinusoidal function based on a fluid dynamics Boussinesq model; and calculating the scattering coefficient of the near-shore nonlinear sinusoidal sea wave by using an analytical progressive model-second-order small slope approximation method; and finally analyzing the seawave scattering coefficient under different near-shore environment water depth change conditions. According to the method, nonlinear sea waves under the condition of near-shore water depth change, which cannot be simulated by a traditional linear sea wave modeling theory, are effectively assessed and analyzed, and compared with existing related researches under the condition of constant water depth for modeling of the traditional linear sea wave modeling theory, the method better meets the requirements of actual near-shore sea wave scattering mechanism analysis. Compared with existing linear sea wave modeling, the method better conforms to the actual near-shore marine environment.

Description

technical field [0001] The invention belongs to the technical field of ocean scattering echo analysis, in particular to a method for analyzing the microwave scattering characteristics of near-shore nonlinear sinusoidal waves. Background technique [0002] At present, the closest existing technology: the scattered echoes under the interaction between the electromagnetic wave emitted by the radar and the ocean surface can reflect a variety of hydrological information in the ocean environment, and can be effectively applied to the inversion of ocean wind speed and water depth, and the extraction of sea spectrum and many other fields. In addition, in the complex ocean environment, the scattered echo also carries the electromagnetic scattering characteristics of the ocean surface and the targets on it. Through data processing, it can effectively retrieve rich information such as sea conditions, target size, and motion status. Remote sensing of the marine environment, maritime ta...

AI Technical Summary

Problems solved by technology

However, the above-mentioned traditional methods often do not consider the influence of gradual changes in water depth on waves, and thus do not conform to the characteristics of waves in the actual nearshore environment.

Therefore, the electromagnetic scattering modeling based on this often cannot accurately reflect the scattering characteristics of ocean waves, which will lead to the distortion of the corresponding sea clutter characteristics, and cannot effectively serve specific applications such as ocean remote sensing and target recognition.

[0004] To sum up, the problems existing in the existing technology are: the waves obtained by the existing wave modeling methods are linear waves or simplified and approximate nonlinear waves, which cannot accurately describe the waves involved in the movement process of the nearshore shallow water environment. The impact of the nonlinear interaction between waves cannot accurately reflect the scattering characteristics of waves in the case of gradual changes in near-shore water depth.

[0006] The significance of solving the above technical problems: Based on the Boussinesq equation model in the theory of fluid mechanics, the accurate simulation of wave motion in the nearshore shallow water environment fundamentally solves the problem that the existing traditional wave simulation methods cannot effectively consider the variation of different water depths near the shore The problem of the nonlinear characteristics of the lower waves makes the simulation effect of the waves consistent with the actual near-shore shallow water waves, and lays a solid foundation for the accurate analysis of the near-shore nonlinear wave scattering characteristics

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