Method for extracting ocean wave parameter in radar image

A radar image and image data technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem of not obtaining waves and achieve the effect of accurate wave parameters

Inactive Publication Date: 2013-02-27
OCEAN UNIV OF CHINA
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Therefore, the research on the wave direction spectrum has more important significance, and the wave

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  • Method for extracting ocean wave parameter in radar image
  • Method for extracting ocean wave parameter in radar image
  • Method for extracting ocean wave parameter in radar image

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[0033] Preferred embodiments of the present invention will be described in detail below. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0034] In order to use the wave parameter information obtained from the SAR image, it is necessary to use the nonlinear transformation relationship between the SAR image spectrum and the wave spectrum. Since the transformation is nonlinear, it cannot be directly inversed. In addition, due to the 180° direction ambiguity in the SAR image spectrum and the loss of high wavenumber information outside the stage wavenumber, a cost function needs to be introduced. This cost function uses the additional information from the so-called first guess spectrum. The first guess spectrum is based on the first Three generations of wave mode-Wave Model (WAM) acquisition.

[0035] Define F(k) when the following value function J takes th...

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Abstract

The invention relates to the technical field of radar signal processing, and in particular relates to a method for extracting an ocean wave parameter in a radar image. The method comprises the following steps of acquiring SAR (Synthetic Aperture Radar) image data; extracting an SAR thick spectrum from the SAR image data; smoothing the SAR thick spectrum to acquire an SAR spectrum; separating a signal in the SAR image spectrum to be a stormy wave generating part and a surge generating part to acquire a stormy wave SAR spectrum and a surge SAR image spectrum; treating the stormy wave generating part to acquire an optimal ocean wave spectrum parameter, so that the acquired optimal ocean wave spectrum parameter is best fitted with the corresponding SAR spectrum and the stormy wave SAR image spectrum; using a linear relation to inverse the surge generating part; synthesizing the stormy wave SAR spectrum corresponding to the optimal ocean wave spectrum parameter and the surge SAR image spectrum which is inversed by the linear relation to be an ocean wave spectrum; and acquiring the ocean wave parameter from the ocean wave spectrum. The method can be used to acquire an accurate ocean wave parameter under complicated geographic wave field conditions such as the diffraction of pure surges, high waves and giant waves, and waves, and islands, and the like.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a method for extracting sea wave parameters in radar images. Background technique [0002] Ocean waves are the ocean phenomenon that is most directly and closely related to human beings, intuitively showing us the magnificence of the sea. Similarly, waves will also cause huge disasters to human beings. In fact, ocean waves are small-scale wind-induced gravity waves that occur on the ocean surface, including wind waves and swells. Ocean waves are an important research field of physical oceanography. Studying the generation, growth, decay and propagation mechanism of ocean waves and revealing their internal structure and external characteristics are of great importance to the construction of national defense, shipping, shipbuilding, ports and offshore oil platforms. significance. [0003] Due to the randomness of ocean waves, it can be regarded as a random proces...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/90
Inventor 孙建张庆君李延齐亚琳刘久利赵良波
Owner OCEAN UNIV OF CHINA
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