Design of Acoustic Signals for a Seal Deterrent Device

Arturs Aboltins; Juris Grizans; Dmitrijs Pikulins; Maris Terauds; Maris Zeltins

doi:10.2478/ecce-2020-0011

Design of Acoustic Signals for a Seal Deterrent Device

Authors

Arturs Aboltins Senior Researcher, Institute of Radioelectronics https://orcid.org/0000-0001-6901-9787
Juris Grizans Researcher, Institute of Radioelectronics
Dmitrijs Pikulins Senior Researcher, Institute of Radioelectronics https://orcid.org/0000-0002-6768-6989
Maris Terauds Senior Researcher, Institute of Radioelectronics https://orcid.org/0000-0001-6934-0036
Maris Zeltins Researcher, Institute of Radioelectronics

DOI:

https://doi.org/10.2478/ecce-2020-0011

Keywords:

Acoustic applications, Acoustic measurements, Acoustic wave, Seals, Signal synthesis, Underwater acoustics, Underwater communication

Abstract

During the past decade, attacks by grey seals on fishing nets in the Baltic Sea have caused considerable loss of fish catch and damage to fishing gears. One of the approaches to reduce the number of seal attacks on fishing nets is to use acoustic deterrent devices (ADDs). Unfortunately, most of the commercially available ADDs are not well suited to the deployment in the sea and require considerable additional investments. The objective of the present research is to develop a compact and cost-efficient ADD for deployment in the sea environment. This paper is devoted to the design of acoustic signals for a prototype ADD. Signals from other experimental and commercially available ADDs are studied and compared. Moreover, limitations imposed by the underwater environment, transducers, battery power, and fish hearing are analysed and considered during the development of signal patterns. The results of tests conducted in an artificial reservoir and in the sea are presented.

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