Abstract
Computer simulations of single-target echo waveforms have been useful for fisheries acoustics. In previous studies, the use of conventional scientific echosounders has been assumed, and therefore a narrowband tone-burst wave has been used as the transmit signal. However, computer simulation methods for recently developed broadband echosounders have not been fully established. In this paper, a method for the computer simulation of broadband single-target echo waveforms using a linear frequency-modulated signal is presented. This simulation method takes into account not only the backscattering amplitude of a target, but also transducer directivities and transmission losses. The simulated broadband single-target echo waveforms will be applicable to various studies. In this study, the broadband signal processing procedure for volume backscattering strength was verified using broadband multiple-target echo waveforms, which were generated by summing a large number of simulated single-target echo waveforms.
