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- W2000998825 abstract "A methodology is presented for distinguishing between propagation and sensor effects as the cause of loss of signal coherence over a line array of acoustic sensors. Using signal-to-noise ratio (S/N) as a measure of coherence auto- and cross-spectral properties of the data are combined into interesting relationships which form the basis of this methodology. It is shown that γlm2 = γlγm = ((S/N)(S/N) + 1)l ((S/N)(S/N) + 1)m, (1) and that ((S/N)(S/N) + 1)¯i2 = 1z(z − 3)/2 ∑ y > z ∑ z ≠ i γ2izγ2iyγ2zy, (2) where γlm2 is the magnitude squared coherence between points l and m along the array and γl is the signal coherence magnitude at point l along the array. The directly measured coherence matrix is compared with the matrix obtained from measured S/N via Eq. (1). The reverse process, Eq. (2), is not unambiguous and average values are therefore obtained." @default.
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- W2000998825 date "1983-05-01" @default.
- W2000998825 modified "2023-09-25" @default.
- W2000998825 title "A methodology for evaluating loss of array coherence" @default.
- W2000998825 doi "https://doi.org/10.1121/1.2020512" @default.
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