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Rapid sea wave simulation method based on Chirp Z transform

A simulation method and wave technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of large amount of calculation of linear superposition method, and achieve the effect of saving simulation time and reducing the amount of calculation

Inactive Publication Date: 2012-11-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] The purpose of the present invention is in order to overcome the defective of prior art, solve the problem that the calculation amount of linear superposition method is huge in the algorithm research of ocean wave simulation, propose a kind of fast ocean wave simulation method based on Chirp Z transform

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  • Rapid sea wave simulation method based on Chirp Z transform
  • Rapid sea wave simulation method based on Chirp Z transform
  • Rapid sea wave simulation method based on Chirp Z transform

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Embodiment

[0032] A fast ocean wave simulation method based on Chirp Z transform, its steps are as follows:

[0033] 1) Calculate the one-dimensional wave spectrum S(ω) by wind speed, the expression of the one-dimensional wave spectrum is:

[0034] S ( ω ) = α g 2 ω 5 exp [ - 1.25 ( ω 0 ω ) 4 ] γ exp [ - ( ω - ω 0 ) 2 2 σ 2 ω 0 2 ] - - - ( 7 )

[0035] Where α is the spectral parameter, and

[0036] α = 0.006 ( U 10 c 0 ) 0.55 - - - ( 8 )

[0037] U 10 Is the average wind speed at a height of 10 meters above the sea surface, c 0 Main wave phase velocity, g is the acceleration of gravity, ω is the angular frequency, ω 0 =g / c 0 Is the spectral peak angular frequency, γ is the peak elevation factor, and σ is the peak shape parameter;

[0038] 2) Convert the one-dimensional wave spectrum obtained in step 1) into the wave frequency direction spectrum S(ω, Φ)...

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Abstract

The invention belongs to the technical field of ocean remote sensing and relates to a rapid sea wave simulation method based on Chirp Z transform. The method comprises the following steps: calculating a one-dimensional sea wave frequency spectrum by virtue of wind speed; converting the one-dimensional sea wave frequency spectrum into a sea wave frequency direction spectrum; converting the sea wave frequency direction spectrum into a two-dimensional sea wave number spectrum; and simulating fluctuation of sea wave by carrying out Chirp Z conversion on the two-dimensional sea wave number spectrum for twice. Compared with the prior art, the method provided by the invention has the advantages that the computation amount can be effectively reduced, and the simulation time is saved.

Description

Technical field [0001] The invention belongs to the technical field of ocean remote sensing, and relates to a fast ocean wave simulation method based on Chirp Z transform. technical background [0002] SAR (Synthetic Aperture Radar) is an all-weather, all-weather high-resolution microwave remote sensing imaging radar. It is playing an increasingly important role in the fields of land surveying, topographic surveying and mapping, ocean and hydrological observation, battlefield reconnaissance, and missile guidance. SAR ocean remote sensing can realize the monitoring of ocean waves, wind fields, shallow sea underwater terrain, sea ice, ships, offshore structures, and oil spills. [0003] Ocean waves are wind-induced gravity waves, which are familiar ocean phenomena. The causes of ocean waves are complex, and ocean waves are also a very complex phenomenon. The study of waves is of great significance to marine engineering construction, marine development, transportation and shipping,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41G06F19/00
Inventor 丁泽刚曾涛杨文付王建平孙晗伟董锡超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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