SAR sea surface wind field and sea wave joint inversion method and system based on spectrum model

Abstract

The invention provides an SAR sea surface wind field and sea wave joint inversion method and system based on a spectrum model, and the method comprises the steps: obtaining a sea surface SAR image, and obtaining SAR cross spectrum and intensity data based on the SAR image; acquiring a sea wave propagation direction based on an imaginary part spectrum of the SAR cross spectrum, and performing radiometric calibration on the intensity data to obtain a backscattering coefficient; taking the sea wave propagation direction as a reference wind direction, combining a backscattering coefficient and a radar incident angle, and utilizing a geophysical model to obtain an inverted wind field parameter; generating an initial guessing wave spectrum E spectrum based on the wave propagation direction and the inverted wind field parameters, and generating an observed SAR image spectrum by using the intensity data; based on the observed SAR image spectrum and the initial guessing wave spectrum E spectrum, obtaining an optimal wave spectrum through inversion by means of an MPI algorithm, and obtaining inverted wave parameters through a spectrum integration method.

Description

technical field [0001] The disclosure belongs to the technical field of wind field and sea wave observation, and in particular relates to a method and system for joint inversion of SAR sea surface wind field and sea wave based on a spectrum model. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The ocean plays a certain role in regulating the global climate, and it contains abundant resources, such as ocean wind fields and waves. The ocean wind field is the main source of power for the movement of the upper ocean, and it is closely related to the generation of waves. Ocean wave is an important ocean dynamic process, which is a small-scale wind-induced gravity wave that occurs on the ocean surface. The monitoring of wind field and sea waves is of great significance to the construction and safety of shipping, ports and offshore oil platfo...

AI Technical Summary

Problems solved by technology

Both wind direction and preliminary guess spectrum information are provided by external data sources, which will cause SAR to be unable to independently detect wind field and sea waves. The inversion accuracy of SAR wind field and sea wave parameters will be affected by the accuracy of external data, and the SAR wind field The timeliness and flexibility of wave parameter inversion are also limited by the timeliness of third-party data

Images