한국수산과학회

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  • 0374-8111
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  • 2287-8815

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kfas, vol. 54, no. 5, pp.798-807, October, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0798

Performance Characteristics of a 50-kHz Split-beam Data Acquisition
and Processing System
50 kHz Split Beam 데이터 수록 및 처리 시스템의 성능특성

이대재*
부경대학교 해양생산시스템관리학부

The directivity characteristics of acoustic transducers for conventional single-beam echo sounders considerably limit
the detection of fish-size information in acoustic field surveys. To overcome this limitation, using the split-aperture
technique to estimate the direction of arrival of single-echo signals from individual fish distributed within the sound
beam represents the most reliable method for fish-size classification. For this purpose, we design and develop a
split-beam data acquisition and processing system to obtain fish-size information in conjunction with a 50-kHz single-
beam echo sounder. This split-beam data acquisition and processing system consists of a notebook PC, a fieldprogrammable
gate array board, an external single-transmitter module with a matching network, and four-channel
receiver modules operating at a frequency of 50-kHz. The functionality of the developed split-beam data processor is
tested and evaluated. Acoustic measurements in an experimental water tank showed that the developed data acquisition
and processing system can be used as a fish-sizing echo sounder to estimate the size distribution of individual
fish, although an external single-transmitter module with a matching network is required.

Keyword : Split-beam processor, Data acquisition and processing system, Direction of arrival (DOA), PC-based echo-sounder system, Fish size estimation

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