Abstract
The detection and classification capability of animal sonar systems may depend on relatively invariant target-echo characteristics compared to reverberation interference. A numerical calculation of the effect of frequency-dependent absorption of sound on target coefficients [R. A. Altes, J. Acoust. Soc. Am. 59, 97–105 (1976)] has been made for several classical targets. The variation of target coefficients have been calculated as a function of range, ocean temperature, and center frequency for several bionic signal wave-forms. It was found that the target coefficients change without any simple recognizable pattern. However, when the cross-correlation coefficient of two sets of normalized energy-weighted target coefficients corresponding to different ranges and ocean temperatures at the same center frequency is calculated, it is found to be less sensitive to absorption than the individual target coefficients. [Work supported by the Naval Sea Systems Command.]
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