Offshore wind speed inversion method based on SAR image and Bragg scattering model

A wind speed inversion and scattering model technology, applied in the direction of re-radiation, radio wave reflection/re-radiation, instruments, etc., can solve the problem of low accuracy and achieve the effect of improving reliability and accuracy

Pending Publication Date: 2022-02-18
SHANGHAI OCEAN UNIV
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Problems solved by technology

However, these GMFs are only suitable for smooth sea conditions, and are less accurate in unstable and complex sea conditions, especially in coastal waters

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  • Offshore wind speed inversion method based on SAR image and Bragg scattering model
  • Offshore wind speed inversion method based on SAR image and Bragg scattering model
  • Offshore wind speed inversion method based on SAR image and Bragg scattering model

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0028] Specifically, such as figure 1 as shown, figure 1 A block diagram of a wind speed retrieval method based on SAR images and a Bragg scattering model provided in an embodiment of the present invention, the method includes the following steps:

[0029] S1: Obtain spaceborne SAR images, based on the Bragg scattering theory, simulate the Bragg resonance roughness through HYCOM's ocean currents and discrete winds, and obtain the Bragg resonance NRCS;

[0030] Specifically, the original spaceborne SAR...

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Abstract

The invention provides an offshore wind speed inversion method based on an SAR image and a Bragg scattering model, and the method comprises the steps: obtaining a satellite-borne SAR image, simulating the Bragg resonance roughness through the sea surface ocean current and discrete wind of an HYCOM based on the Bragg scattering theory, and obtaining the Bragg resonance NRCS; performing non-Bragg roughness simulation by measuring an SAR image NRCS under polarization to obtain a non-Bragg NRCS, and combining the Bragg resonance NRCS and the non-Bragg NRCS to obtain a simulation NRCS corresponding to each discrete wind speed; taking the wind speed corresponding to the minimum difference between the simulated NRCS obtained by discrete wind simulation and the NRCS observed by the SAR as an inversion result, and obtaining an inversion wind field; and verifying the applicability of the wind speed inversion method. According to the method, the reliability and the accuracy of offshore SAR image wind field inversion are improved.

Description

technical field [0001] The invention relates to the technical field of marine numerical simulation, in particular to an offshore wind speed inversion method based on SAR images and a Bragg scattering model. Background technique [0002] In the past few decades, remote sensing technology has been greatly developed. A scatterometer is a non-imaging radar sensor. Generally speaking, satellite scatterometers are used for wind field observations, such as QuikSCA, Advanced Scatterometer, China Ocean-2B and Sino-French Ocean Satellite. The radar incidence angle of the scatterometer is between 20° and 60°, using Bragg resonance as the main microwave scattering mechanism, so the wind vector including wind speed and direction is directly related to the normalized backscatter cross section NRCS and the radar incidence angle related. Based on this principle, the empirical model Geophysical Model Equation (GMF) was developed. Since it is difficult to obtain both wind speed and wind di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01S13/90G01S13/95G06F113/08
CPCG06F30/20G01S13/9021G01S13/95G06F2113/08Y02A90/10
Inventor 邵伟增孙展凤胡宇逸
Owner SHANGHAI OCEAN UNIV
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