Geoacoustic inversion using cross correlation function of low-frequency ambient noise in the Shallow Water 2006 Experiment

2018 ◽  
Vol 144 (3) ◽  
pp. 1973-1973
Author(s):  
Marina Yarina ◽  
Boris Katsnelson ◽  
Jixing Qin ◽  
Oleg A. Godin ◽  
Tsu Wei Tan
Keyword(s):  
Correlation Function ◽  
Shallow Water ◽  
Ambient Noise ◽  
Cross Correlation ◽  
Low Frequency ◽  
Cross Correlation Function ◽  
Geoacoustic Inversion

A Waveguide-Invariant-Based Warping Operator and Its Application to Passive Source Range Estimation

2015 ◽  
Vol 23 (01) ◽  
pp. 1550003 ◽  
Author(s):  
Yu Bo Qi ◽  
Shi Hong Zhou ◽  
Ren He Zhang ◽  
Yun Ren
Keyword(s):  
Correlation Function ◽  
Cross Correlation ◽  
Low Frequency ◽  
Cross Correlation Function ◽  
Range Estimation ◽  
Waveguide Invariant ◽  
Correlation Component ◽  
The Cross ◽  
The Relationship ◽  
Warping Operator

A formula for the instantaneous phase of the cross-correlation function of two different modes using the relationship between the horizontal wavenumber difference and frequency described by the waveguide invariant is deduced in this paper. Based on the formula, a waveguide-invariant-based warping operator suitable for both reflected and refracted modes in shallow water at low frequency is presented, providing an effective tool to filter the cross-correlation function of modes from the signal autocorrelation function. Using the phase of the filtered cross-correlation component in the frequency domain, a passive source ranging method on a single hydrophone is proposed. Simulated and experimental data using impulsive signals verify the validity of the derived warping operator and source ranging method.

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