Population size estimation of chirp and grunt generating fish and mammals using cross-correlation based technique with three acoustic sensors

Impact of unequal distances among acoustic sensors on cross-correlation based fisheries stock assessment technique

“…This type of array can be either ASL form or AST form as in Ref. 10 . In this section, first, we will describe the methodology of ASL scheme and then AST scheme.…”

“…R of CCF is defined as the ratio of standard deviation (σ) to the mean (µ) is chosen as the estimation parameter of this process, as it requires no prior knowledge of the signal strength 16 . Two estimation parameters, R 12 and R 23 are derived from two CCFs, C 12 (τ) and C 23 (τ), respectively (where, τ is the time delay), to calculate the final estimation parameter of ASL scheme 10 . Then, the final estimation parameter, R 2CCF…”

“…In the AST scheme, three CCFs, C 12 (τ), C 23 (τ), and C 31 (τ) are used for estimation 10 . The estimation parameters, R 12 , R 23 , and R 31 are derived from three CCFs, i.e., C 12 (τ), C 23 (τ), and C 31 (τ), respectively, to calculate the ultimate estimation parameter of the AST scheme.…”

“…Hossain and Hossen have investigated the impact of increasing number of acoustic sensors, i.e., increasing number of cross-correlation function (CCF) in Ref. 10 . Hossain and Hossen also have shown the effect of underwater bandwidth and SNR on this technique in Ref.…”

“…In this section, the methodology of cross-correlation based population estimation technique 9 , 10 , 15 is deliberated. We have considered three acoustic sensors array in this study.…”