A Microwave Scattering Remote Sensing Method for Ocean Wave Slope Distribution

Abstract

The invention discloses a microwave scattering remote sensing method of sea wave slope distribution. The method includes the following steps that: (1) a small-incident angle 360-degree-rotation spectrometer is utilized to emit electromagnetic waves so as to detect the surface of the ocean, a backscattering coefficient sigma 0 (theta, Phi) which varies with an incident angle theta and an azimuth angle Phi; (2) sea wave slope is represented by a four-order Gram-Charlier series, a simulation value (theta, Phi) is calculated through utilizing a quasi mirror image scattering principle and based on the sea wave slope; (3) two-dimensional fitting is performed on the incident angle theta and the azimuth angle Phi through utilizing the actual measurement data sigma 0 (theta, Phi) which are obtained in the step (1) and the simulation value (theta, Phi) which is obtained in the step (2), so that seven parameters in Gram-Charlier can be obtained, and the parameters are substituted into the four-order Gram-Charlier series, and therefore, the sea wave slope distribution of a certain measurement point can be completely described. According to the microwave scattering remote sensing method of the invention, a microwave scattering method is used for the first time, and the quasi-Gaussian sea wave slope probability density distribution of a certain measurement point can be obtained through inversion. The microwave scattering remote sensing method of the invention is of great importance in researches on the generation, growth, decline and transmission mechanisms of sea waves, turbulent exchange processes of an air-sea interface, and quantitative extraction of sea surface roughness.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing, and more specifically relates to a microwave scattering remote sensing method for the slope distribution of ocean waves. Background technique [0002] Wave slope is an important physical parameter of ocean waves. Many physical processes at the air-sea interface are closely related to the wave slope, such as the internal kinetic energy of the wave field, including wave breaking and nonlinear energy transfer, which is a strongly correlated function of energetic waves and high-frequency wave steepness. The drag induced by the wave slope affects the aerodynamic roughness of the sea surface and the turbulent exchange characteristics of the surface layer. Obtaining the wave slope is of great significance for studying the generation, growth, attenuation and propagation mechanism of waves, the turbulent exchange process at the air-sea interface, and quantitatively extracting the roughne...

AI Technical Summary

Problems solved by technology

[0015] The invention provides a microwave scattering remote sensing method for ocean wave slope distribution, which is a two-dimensional inversion method with higher efficiency, smaller error, and the ability to invert the slope of a certain time-space point, and its purpose is to solve the current one-dimensional slope The inversion method cannot obtain slope skewness information, and the existing two-dimensional inversion method cannot perform slope inversion for a single wind speed, and an approximation is introduced in the inversion process, and there are still problems such as incomplete slope variance

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