Haro Strait geometry from time-domain data

Abstract

This paper presents results which relate to the geometry of various Haro Strait scenarios. In particular, from the time-domain data we can estimate the source range, source depth, individual phone ranges, individual phone depths, and water depths at the source and at the array. These parameters are optimally estimated based on the time-domain signals alone. We assume that the bottom is sloping, consider up to four reflections (surface, bottom, surface-bottom, and bottom-surface), and allow for up to 16 phones of data. We see that nonuniqueness can still be an issue even using a great deal of time-domain data. However, these parameters are nearly uniquely estimated if additional constraints are considered, particularly on the arrays. Some of the optimal parameters are ‘‘confirmed’’ by simulating the signals for the predicted geometries by means of a pulse PE (RAMGEO) propagation code (courtesy of M. Collins) and then comparing those simulated signals with the observed data.