Detection method of freak wave in across-track interference SAR images

A detection method and deformed wave technology, applied in image analysis, image data processing, radio wave measurement system, etc., to achieve high-precision results

Inactive Publication Date: 2012-09-12
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

[0007] In order to overcome the deficiencies of the existing SAR image deformity wave detection methods, the technical problem to be solved by the present invention is to provide a cross-track interference SAR image that can detect the local features of the deformity wave peak and has higher precision Detection Method of Freak Wave

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  • Detection method of freak wave in across-track interference SAR images
  • Detection method of freak wave in across-track interference SAR images
  • Detection method of freak wave in across-track interference SAR images

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Embodiment Construction

[0025] Now, the present invention will be described in detail in conjunction with the accompanying drawings. figure 1 It is a flowchart of the present invention. A detection method for deformed waves in cross-track interferometric SAR images. Include the following steps:

[0026] 1. Read in the cross-track interferometric SAR complex image i 1 (x, y) and i 2 (x, y), using the interferometric phase of the complex image , find the sea surface wave height z(x, y);

[0027] Find the complex image i first 1 (x, y) and i 2 Interferometric phase of (x, y) The method is: complex image i 1 (x, y) and i 2 After the conjugate of (x, y) is multiplied, it is converted into the form of amplitude and phase, and the interference phase is taken out and perform phase unwrapping;

[0028] Interferometric phase The relationship with the sea surface wave height z(x, y) is,

[0029]

[0030] Among them, (x, y) are the coordinates of the azimuth direction and the distance directi...

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Abstract

The invention belongs to the filed of ocean microwave remote sensing technology, and relates to a detection method of freak wave in across-track interference SAR images. The detection method comprises the following steps of a. reading in across-track interference SAR complex images i1(x, y) and i2(x, y), and working out sea surface wave lifting height z(x, y) utilizing the interference phase Delta<phi> of the complex images; b. working out a propagation direction of ocean wave utilizing an imaginary part of a cross spectrum of the interference SAR complex images i1(x, y) and i2(x, y); c. working out the height Hs of an effective wave according to the sea surface wave lifting height z(x, y); d. determining a big wave position and height z<freak> (a, r, eta) of the sea surface wave lifting height using the height z(x, y) of the effective wave as a reference standard; and e. calculating a kurtosis coefficient of the big wave along the propagation direction of the ocean wave, and determining whether the big wave is freak wave or not. The detection method overcomes the shortage of the conventional freak wave detection method of the SAR images. The method is able to detect the local feature of the freak wave crest and has relatively high precision.

Description

technical field [0001] The invention belongs to the technical field of marine microwave remote sensing, and relates to a method for detecting deformed waves in cross-track interference SAR images. Background technique [0002] Freak wave is a special wave with extremely high wave height and steep crest, which can appear instantaneously and last for a short time in calm deep sea or shallow sea. Therefore, deformed waves can pose a serious threat to coastal buildings, offshore oil platforms and ship navigation. Synthetic aperture radar (SAR, synthetic aperture radar) is a high-resolution imaging radar, which has been widely used in the study of ocean dynamics, such as internal waves, wave spectrum and sea surface currents. [0003] Due to the uncertainty of the occurrence of deformed waves, the data of deformed waves obtained by buoy measurement is relatively small; however, a large amount of global ocean observation data can be obtained by using SAR microwave ocean observati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G01S13/90
Inventor 杨永红林明张贞凯奚彩萍凌霖
Owner JIANGSU UNIV OF SCI & TECH
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