Split-beam sonars: a backscatter model and prototype data analysis

Belgarde, Axel (2024) Split-beam sonars: a backscatter model and prototype data analysis. Masters thesis, Memorial University of Newfoundland.

[English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (56MB)

Abstract

Split-beam echosounders provide estimation of fish size by directly measuring their target strength. A model that can be used to evaluate and optimize split-beam sonar performance is presented. The model has been used to generate beam patterns to match prototype instruments and to simulate acoustic signals based on the scattering of sound from particles in a three-dimensional domain. The sum of the contribution of the scatterers is sampled at the transducer locations, resulting in simulated signals used for data processing and sonar performance prediction. The model’s capabilities were evaluated through comparisons with ASL Environmental Sciences’ AZFP-Split prototype system. The field trials were conducted in Saanichton, BC, by lowering a calibration target sphere to a range of 220 m in the acoustic beam. Both model prediction and prototype system performance show accuracy of σ = 0.2 dB at 25 m range. Potential future applications of the model include exploring methods of target separation and improving accuracy when presented with complex target structures.

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