Abstract
The cross-correlation of the underwater acoustic noise field at two locations is related to the time-domain Green’s function (TDGF) between the two locations. The propagation conditions, the distribution of noise sources, and the hydrophone locations have a significant influence on the part of the TDGF that can be reliably reconstructed through the cross-correlation procedure. In the low-frequency part of the acoustic spectrum the dominating noise source is shipping, and for that case the effect of propagation conditions on the result of the cross-correlation procedure is studied by considering typical sound velocity profiles and hydrophone setups. The aim is to understand the effect that propagation conditions have on the cross-correlation procedure and point to the potential advantages of certain areas for the conduct of passive tomography experiments. Further, the effect of mooring motion on the cross-correlation result is addressed and ways to remove this effect, e.g., with the help of long-baseline navigation systems will be discussed. [Work supported by ONR.]
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