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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[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 resolution of observation instruments, sea conditions, meteorological parameters (wind speed, wind direction, rainfall) and other factors
In addition, when there are targets such as mixed waves or ships on the sea surface, multiple peaks appear in the two-dimensional numerical spectrum. The traditional method based on gradient search for extremum is easily affected by local extremum, and cannot accurately determine the peak of the spectrum, which affects the influence of sea waves. Estimation of peak parameters
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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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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.
Description
technical field [0001] The invention belongs to the technical field of ocean wave observation, and in particular relates to an ocean wave spectrum and wave height inversion method based on analytic function theory. Background technique [0002] Waves are an important part of physical oceanography research and an important parameter in the fields of ocean forecasting, disaster prevention and mitigation, ocean engineering, and navigation safety. Wave observation is one of the main contents of marine observation, and there are many observation methods, mainly including artificial wave measurement, on-site instrument wave measurement and remote sensing inversion wave measurement. [0003] Ocean wave spectrum is an important parameter reflecting the energy distribution of ocean waves. At present, remote sensing observation of ocean wave spectrum is generally based on Fourier transform. For example, two-dimensional Fourier transform is commonly used to obtain image spectrum for a ...
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Login to View More IPC IPC(8): G06F30/27G06F17/15G06F17/14G06N3/00G01C5/00
CPCG06F30/27G06F17/15G06F17/14G06N3/006G01C5/00Y02A90/10
Inventor 王铮陈忠彪戴子玥田飞魏婧雅姚玉雯何宜军于思源朱睿君
Owner NANJING UNIV OF INFORMATION SCI & TECH