A Method for Extracting Wave Breaking Rate Based on Coherent X-band Radar Image

A radar image and X-band technology, applied in radio wave reflection/reradiation, radio wave measurement system, utilization of reradiation, etc., can solve problems such as small sea surface area, limitation, and uneven spatial ratio, and reduce the amount of calculation , the effect of increasing speed
CN104133208BInactive Publication Date: 2016-06-01OCEAN UNIV OF CHINA
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
OCEAN UNIV OF CHINA
Publication Date
2016-06-01
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

Disclosed is an ocean-wave broken-rate extraction method based on coherent X-waveband radar images. The method includes the following steps: obtaining the coherent X-waveband radar complex images; solving a multiple correlation function of the complex image in a time domain; solving a phase difference of the radar complex images based on the multiple correlation function and obtaining a phase difference image; carrying out Radon transformation on the phase difference image so that an ocean-wave phase speed is obtained; carrying out short-time FFT transformation on the multiple correlation function so that a short-time Doppler frequency spectrum of the multiple correlation function is obtained; calculating an orbital speed of ocean waves based on the short-time Doppler frequency spectrum; and obtaining the ocean-wave broken rate of the whole measured sea area. The method significantly reduces a calculation quantity in an ocean-wave broken-rate extraction process and improves the speed; a coherent X-waveband radar is free from restriction of complex ocean environment conditions; and the effective action distance of the coherent X-waveband radar is far larger than a camera and the obtained ocean-wave broken rate can better reflect a true statistical characteristic.
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Description

technical field

[0001] The invention relates to the marine application field of coherent X-band radar, in particular to a method for extracting wave breaking rate based on coherent X-band radar images. Background technique

[0002] Wave breaking is an important marine phenomenon that occurs in ocean waves. Wave breaking is a main physical mechanism of wave energy attenuation. At the same time, wave breaking also significantly strengthens the exchange of momentum, energy and gas between the ocean and the atmosphere; The destructive power of offshore or coastal engineering is large, so this phenomenon has also attracted much attention in the field of marine engineering. The wave breaking rate is the basic statistical characteristic parameter to describe the important sea area phenomenon of wave breaking. The wave breaking rate is the basic parameter for calculating statistical parameters such as wave breaking intensity, breaking time, and bubble distribution in the sea. Ther...

Claims

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