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Ocean-wave broken-rate extraction method based on coherent X-waveband radar images

A technology of radar image and extraction method, applied in the direction of reflection/re-radiation of radio waves, radio wave measurement system, utilization of re-radiation, etc., can solve the problems of small sea surface area, limitation, uneven spatial ratio, etc. , the effect of increasing the speed

Inactive Publication Date: 2014-11-05
OCEAN UNIV OF CHINA
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Problems solved by technology

The main problems in the current method of obtaining the wave breaking rate by taking pictures of the sea surface with a camera include: first, the area of ​​the sea surface to be photographed is small; Thirdly, when the wind and waves are strong, the method of using the camera to capture the wave breaking rate will also be limited by the platform; in addition, the effect of the camera is not good when working at night

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  • Ocean-wave broken-rate extraction method based on coherent X-waveband radar images
  • Ocean-wave broken-rate extraction method based on coherent X-waveband radar images
  • Ocean-wave broken-rate extraction method based on coherent X-waveband radar images

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Embodiment Construction

[0044] see figure 1 , this embodiment includes the following steps:

[0045] 1) Obtain the coherent X-band radar complex image of the sea area to be measured;

[0046] Set the coherent X-band radar on the ship or on the coast, and obtain the time-domain radar complex image with fixed antenna beam pointing by transmitting coherent radar pulses to the sea surface, or obtain the sea surface sector echo radar complex image under the antenna beam scanning mode;

[0047] It is characterized in that it also includes the following steps:

[0048] 2) seek the complex correlation function of the above-mentioned X-band radar complex image in the time domain;

[0049] 3) solving the phase difference of the above-mentioned radar complex image based on the complex correlation function, and obtaining the phase difference image;

[0050] 4) Radon transformation is carried out to the phase difference image to obtain the wave phase velocity;

[0051] 5) Carry out short-term FFT transformati...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/02G01S13/88
CPCG01S7/41G01S13/89
Inventor 王运华李慧敏张彦敏
Owner OCEAN UNIV OF CHINA
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