Underwater acoustic signal design and feedback regulation method for large yellow croaker sound trapping

Abstract

The invention discloses an underwater acoustic signal design and feedback regulation method for large yellow croaker sound trapping, and relates to underwater acoustic signal design and parameter feedback regulation of large yellow croaker sound trapping. According to the signal design, linear frequency modulation signals are adopted according to the auditory threshold curve of the large yellow croaker and are processed through a designed reverse filter, so that emitted sound signals cover the auditory threshold range of the large yellow croaker, the sound power at the frequency band with thehighest auditory sensitivity of the large yellow croaker reaches the maximum, and the sound trapping effect of the large yellow croaker can be enhanced; in the implementation process, the transmittingtransducer is a cylindrical transducer, sound wave radiation in the horizontal all-direction is facilitated, and a uniform sound field is constructed. A feedback adjusting mechanism is added in the sound wave emission process; the amplitude adjustment coefficient and the passband proportion adjustment coefficient of the filter are calculated according to the larimichthys crocea ingestion sound received by the spherical hydrophone, and the waveform of the trapping sound wave can be flexibly changed according to a sea area background noise field through feedback adjustment, so that the reduction of the induction degree of the larimichthys crocea to the sound wave is prevented, and meanwhile, the emission power consumption can be reduced.

Description

technical field [0001] The present invention relates to the underwater acoustic signal design and parameter feedback adjustment of large yellow croaker sound trapping, in particular to clever design of the anti-acoustic signal by using the iterative reweighted least squares algorithm (IRLS) under the minimum Lp norm criterion according to the hearing threshold curve of large yellow croaker. The digital filter is used to enhance the effective frequency of the acoustic trapping signal and use the feedback mechanism to design the appropriate strength of the acoustic trapping signal, so as to trap the large yellow croaker more effectively, achieve fixed-point feeding and control the activity space of the large yellow croaker. Continuous feedback adjustment of the filter amplitude and passband ratio so that the trapping sound waves of different waveforms can adapt to different background noise environments in different sea areas and save power consumption is an underwater acoustic s...

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Problems solved by technology

([2] Yin Leiming. Research on the behavioral response and mechanism of large yellow croaker acoustic trapping [D]. Shanghai: School of Marine Science, Shanghai Ocean University, 2017.) At the same time, because large yellow croaker has otoliths in the inner ear, it is very sensitive to noise. Knocking, which was popular in China in the 1950s and 1960s, took advantage of the sensitivity of large yellow croakers to noise, leading to overfishing and almost extinction of large yellow croakers.

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