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

In this paper, results of measurements and analysis of the cross correlation function (CCF) of the ambient noise field in a low frequency band (10–200 Hz) are presented. Records of the noise were obtained by single hydrophones (SHRUs) in the Shallow Water 2006 (SW06) experiment on the New Jersey continental shelf during about a month. Five SHRUs were placed approximately along a straight line perpendicular to the coastal line, distances between adjacent hydrophones were 5–8 km, ocean depth was 80–100 m. Analysis of the experimental data was carried out by calculating time-frequency diagrams of CCFs for different pairs of SHRUs, with subsequent mode filtering on the basis of the warping transform. Theoretical calculations of mode parameters for comparison with the experiment were done using different waveguide models, including the geoacoustic models previously proposed for the area of SW06 by other authors based on active source data. [Work supported by BSF-NSF grant.]