Numerical simulation method for radar backscattering section of wave-current coupling sea surface

Abstract

The invention discloses a numerical simulation method for a radar backscattering section of a wave-current coupling sea surface. The method comprises the following steps: setting sea surface simulation parameters and radar parameters to establish a wave-current coupling electromagnetic scattering model according to a sea surface state to be simulated by a user and an adopted radar sensor type; acquiring a wave-current coupling sea surface evolution process and a representative transient sea surface; further inversing a radar backscattering coefficient gamma and deducing a normalized radar backscattering section sigma 0 according to the wave-current coupling electromagnetic scattering model by virtue of the Huygens principle, Kirchhoff approximation and a Dirac green function. According to the method, a wave-current coupling sea surface and electromagnetic wave interaction mechanism can be acquired, researches on wave-current coupling electromagnetic scattering characteristics can be promoted, and the method can be adopted as a technical means for research and development of sea current radar retrieval.

Description

technical field [0001] The invention belongs to the technical field of marine technology, and in particular relates to a wave-current coupled sea surface radar backscatter cross section numerical simulation method. Background technique [0002] Ocean currents have a decisive impact on the ocean environment. It is the transport link of energy and nutrients. At the same time, it can also disperse marine garbage and various polluted water bodies to all corners of the global ocean, thereby affecting global water bodies and air-sea exchanges. Therefore, all-weather and large-scale monitoring of ocean surface currents is very important. Although people can use Acoustic Doppler Current Profiler (ADCP) to accurately measure sea surface and underwater current profiles, similar direct measurement methods are far from satisfying quasi-real-time, Satellite remote sensing has become the only means to meet the demand of large-area synchronous measurement. Unfortunately, so far, although ...

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Problems solved by technology

Therefore, all-weather and large-scale monitoring of ocean surface currents is very important. Although people can use Acoustic Doppler Current Profiler (ADCP) to accurately measure sea surface and underwater current profiles, similar direct measurement methods are far from satisfying quasi-real-time, The demand for large-area simultaneous measurement, satellite remote sensing has become the only means to meet this demand

Unfortunately, so far, although there are sporadic and limited algorithms for inversion of sea surface current velocity, for example, some people have tried to use Synthetic Aperture Radar (SAR) Doppler centroid shift and along-track interferometry (ATI) technology for ocean current inversion, However, there is no direct monitoring of ocean currents on the satellite, the main reason is that the interaction mechanism of ocean wave-ocean current coupling between the sea surface and electromagnetic waves is not fully understood, which leads to the lack of remote sensing inversion methods for ocean currents

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