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Time of arrival difference estimation for narrow band high frequency echolocation clicks

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Abstract

Algorithms are presented for the accurate time of arrival difference estimation of high frequency narrow band echolocation clicks from Harbor Porpoise. These clicks typically have a center frequency of around 130 kHz (wavelength ∼1.2 cm) and duration of <0.1 ms. When using hydrophones spaced centimeters apart, spatial aliasing can cause large errors on inter-hydrophone timing measurements due to the incorrect peak in the cross-correlation function of two signals being selected. It is shown that at sample rates of less than about 6 times the fundamental frequency, the incorrect correlation peak will be selected in 55% of measurements leading to large errors in time of arrival estimates. For clicks with a SNR > 10 dB these errors can be reduced by over two orders of magnitude through a combination of up-sampling the data and parabolic interpolation of peaks in the cross-correlation functions.
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Original languageEnglish
Pages (from-to)EL387-EL392
Number of pages7
JournalJournal of the Acoustical Society of America
Volume146
Issue number4
Early online date23 Oct 2019
DOIs
Publication statusPublished - Oct 2019

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