Method for forecasting echo characteristics of underwater lactating organisms

An echo characteristic and biological technology, applied in the field of acoustics, can solve the problems of inability to meet defense needs, high experimental costs, and inability to measure the echo characteristics of dolphins.

Pending Publication Date: 2022-07-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign studies on the propagation of sound waves in human tissues and other mammalian organisms are mostly concentrated in the ultrasonic frequency band, and most of them are for the purpose of medical research, and there are few studies on sound scattering of frogmen and marine mammals; Or there is less research on the echo characteristics of frogmen, which cannot meet the needs of modern defense
[0003] Scholars at home and abroad have mainly focused on measuring the target strength through experiments on the echo characteristics of dolphins. However, because there are many types of dolphins and their sizes are different, the cost of experiments is high. In addition, dolphins have been listed as protected animals, so it is no longer possible to measure the intensity of real dolphins. Dolphins conduct echo characteristic measurement experiments

Method used

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  • Method for forecasting echo characteristics of underwater lactating organisms
  • Method for forecasting echo characteristics of underwater lactating organisms
  • Method for forecasting echo characteristics of underwater lactating organisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1: The time domain echo simulation calculation is carried out for dolphins with a length of 2.2 meters in a horizontal attitude of 0o to 180o. The acoustic wave transmitting and receiving points are 90 meters away from the center of the dolphin's lungs. FM signal, Image 6 is the distance-angle time domain echo of the dolphin, the abscissa in the figure corresponds to the incident angle of the sound wave, and the ordinate corresponds to the distance. Depend on Image 6 The bright lines of the dolphin's head, flippers, dorsal and caudal fins can be clearly seen, and they make important contributions to the dolphin's target strength, of which the broadside contributes significantly at 90o.

Embodiment 2

[0082] Example 2: the incident sound wave frequency f=67kHz, at this time, the attenuation coefficient is a=4.45neper / m. Calculate the target intensity for the next week in the dolphin's horizontal stance, and the results are as follows Figure 7 shown.

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Abstract

The invention relates to the technical field of acoustics, and discloses an underwater lactating organism echo characteristic forecasting method, which comprises the following steps of: establishing a geometric model of a dolphin by utilizing a three-dimensional scanner and model software; establishing a dolphin acoustic reflection coefficient model, namely a water-fat layer-air reflection coefficient model suitable for the dolphin; through a plate element method considering material attributes, target echo characteristics of lactating organisms are calculated. According to the method, the omni-directional time domain echoes and the target intensity of the dolphin and the whale can be quickly and theoretically forecasted. And data support is provided for verifying echo characteristics of the dolphin and the whale and improving the recognition capability of the underwater monitoring sonar on the dolphin and the whale.

Description

technical field [0001] The invention relates to the technical field of acoustics, in particular to a method for predicting echo characteristics of underwater mammals. Background technique [0002] Active sonar is one of the effective means to detect frogs and underwater mammals. In recent years, the acoustic detection and identification of frogmen is one of the key development trends of underwater security and special operations. However, the echo characteristics of large mammals in the ocean, such as dolphins, have a certain similarity with the echo characteristics of frogmen, which will affect the ability of sonar to detect and identify frogmen. In order to improve the accuracy and detection efficiency of the anti-frogman sonar detection system, it is necessary to have a certain understanding of the echo characteristics of marine mammals (dolphins, etc.) in order to identify dolphins and underwater frogmen targets. Foreign studies on the propagation of sound waves in hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06F30/10G06F30/23G06F111/10
CPCG06T17/20G06F30/10G06F30/23G06T2200/08G06F2111/10
Inventor 王斌范军王文欢周富霖赵开琦黎洁
Owner SHANGHAI JIAO TONG UNIV
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