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Seine object fish shoal tracking method based on horizontal fishgraph images

A horizontal fish finder and target technology, which is applied in the direction of instruments, sound wave re-radiation, and utilization of re-radiation, can solve the problem of lack of three-dimensional image for three-dimensional estimation of fish quantity and lack of prediction for fish school to effectively track fish movement trajectory. Judgment and other problems to achieve the effect of improving detection probability and tracking performance, improving development efficiency, and improving success rate

Inactive Publication Date: 2016-05-11
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

Due to the fast swimming speed and agile movements of tuna, when the fish school is found and then rounded up, it will lead to high-altitude net rate, and there will be no good harvest
Existing horizontal fish finders can only detect the size and distribution of underwater fish schools, lack of effective tracking of fish schools and prediction of fish school trajectory, and lack of three-dimensional images to estimate the number of fish schools

Method used

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  • Seine object fish shoal tracking method based on horizontal fishgraph images
  • Seine object fish shoal tracking method based on horizontal fishgraph images
  • Seine object fish shoal tracking method based on horizontal fishgraph images

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Embodiment Construction

[0032] figure 1 It is the hardware circuit block diagram of the whole system of the present invention, and the hardware system of the present invention comprises the sonar head 1 that underwater acoustic transducer is housed, and described sonar head 1 is connected with data acquisition card 2, and the analog signal that data acquisition card 2 obtains passes through analog signal. The digital conversion module 3 is passed to the PC 4; the sensors 6 such as the gyroscope 5, GPS and tidal current gauge obtain the ocean current and navigation information, and pass the information to the PC 4. At the same time, the sonar head 1 of the present invention can change the inclination angle of beam emission and can rotate 360 ​​degrees.

[0033] The workflow of the system is as follows:

[0034] Step 1: Obtain the original signal through the sonar head equipped with the underwater acoustic transducer, use the data acquisition card to condition the original signal, and then convert the...

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Abstract

The invention discloses a seine object fish shoal tracking method based on horizontal fishgraph images. Through obtaining echo signals of a fishgraph, a seine object fish shoal is tracked, a movement locus is predetermined, and thus the success rate of seine fishing is improved. According to the invention, through adjusting the inclination angle of a sonar, changing the emission direction of sound waves and performing 360-degree rotation, underwater three-dimensional space can be scanned, three-dimensional images are drafted, the quantity of fish shoals is estimated in a stereo mode, and effective help is provided for development of fish resources.

Description

technical field [0001] The invention relates to a method for tracking fish schools, in particular to a method for tracking and predicting target fish schools in purse seines based on images of horizontal fish finders, and for estimating the number of fish schools based on three-dimensional images. Background technique [0002] The fishing methods of pelagic fisheries mainly include trawling, purse seine, longline fishing, squid fishing and other forms. For tuna fishing, purse seine is the most important method. Due to the fast swimming speed and agile movements of tuna, when a school of fish is found and then rounded up, it will lead to a high-altitude net rate, and there will be no good harvest. Existing horizontal fish finders can only detect the size and distribution of underwater fish schools, lack effective tracking of fish schools and prediction of fish school trajectory, and lack the three-dimensional image to estimate the number of fish schools. Contents of the ...

Claims

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Application Information

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IPC IPC(8): G01S15/96
CPCG01S15/96
Inventor 荆丹翔王晓丁武建勇陈桂辉应义星韩军
Owner ZHEJIANG UNIV
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