R.M. Calazan, a53956(at)ualg.pt
O.C. Rodríguez, orodrig(at)ualg.pt
LARSyS, University of Algarve, Campus de Gambelas, PT-8005-139 Faro, Portugal.
Comments: download pdf.
Ref.: UACE2017 Proceeedings
2017.
Abstract:
Eigenray search in a two-dimensional waveguide is a feasible task, that can be
solved efficiently through optimization of an ad hoc defined function (like, for instance, final
ray depth deviation from hydrophone depth) over original ray elevations; in the worst case
even when rays can be reflected backwards to the source an exhaustive search over the ray
trajectory can be able to identify eigenrays by testing the proximity of each ray to the
hydrophone. In three-dimensional waveguides the situation is far more complicated: the
proximity method can be found to be very inefficient due to out-of-plane propagation and
optimization needs to be developed over the plane of ray elevations and azimuths. The work
presented here addresses the three-dimensional search of eigenrays based on the simplex
method, implemented in a recent ray model; the performance of the method is discussed
through comparisons with experimental data for a vertical line array.