Sea wave spectrum and wave height inversion method based on analytic function theory

An analytical function, wave spectrum technology, applied in complex mathematical operations, height/level measurement, calculation models, etc., can solve the estimation of parameters affecting the peak value of waves, difficult to determine, and has a large impact, achieving simple implementation and high accuracy. Effect

Pending Publication Date: 2021-06-11
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0004] Although the methods based on Fourier transform and modulation transfer function have been widely used, their disadvantages are that only the numerical solution of the ocean wave spectrum can be obtained through Fourier transform, which is easily affected by noises such as instrument noise and sea surface targets. , especially in low sea state is greatly affected by noise
Generally, the influence of noise is reduced by setting a threshold, but this threshold is not easy to determine due to the resol

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  • Sea wave spectrum and wave height inversion method based on analytic function theory
  • Sea wave spectrum and wave height inversion method based on analytic function theory
  • Sea wave spectrum and wave height inversion method based on analytic function theory

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[0033] The ocean wave spectrum and wave height inversion method based on the analytical function theory of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 As shown, a wave spectrum and wave height inversion method based on analytic function theory includes the following steps:

[0035] Step 1. Obtain the two-dimensional ocean wave spectrum S(k x ,k y ), k x Indicates the wave number in the x-axis direction, k y Indicates the wave number in the y-axis direction; includes:

[0036] Step 101. Select an area with clear wave stripes from the sea surface image of remote sensing observation, and use the nearest neighbor interpolation method to interpolate it into a square area to obtain the grayscale image matrix I(x, y, t) of the research area, where x , y, t represent the abscissa, ordinate, and image acquisition time of the grayscale image respectively, see figure 2 ;

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Abstract

Disclosed is a sea wave spectrum and wave height inversion method based on an analytic function theory, the two-dimensional sea wave spectrum is obtained through sea surface image inversion, the extreme point and the energy value of the spectrum are obtained through the particle swarm optimization algorithm, the analytic expression of the sea wave spectrum is obtained through the analytic function theory, and therefore the sea wave energy and the wave height of the spectrum are accurately determined. The invention has the advantages of high accuracy and simple implementation. The invention solves the problems that the noise threshold is not easy to accurately determine and the spectrum peak search is inaccurate when the sea wave spectrum is inverted by using the remote sensing image at present, and can be used for inverting the sea wave spectrum and the height of the sea wave by using the sea surface image observed by a radar or an optical instrument.

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Application Information

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Owner NANJING UNIV OF INFORMATION SCI & TECH
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