ASA 125th Meeting Ottawa 1993 May

2aAO9. Source localization based on coherent scattering from a rough seafloor in an uncertain underwater environment.

George Haralabus

Dimitri Alexandrou

Loren W. Nolte

Duke Univ., Dept. of Elec. Eng., Box 90291, Durham, NC 27708-0291

In the present localization scenario, direct propagation from the source to the receiver is not permitted. The received field is comprised only by acoustic waves scattered from an infinitely hard seafloor and it is calculated using the Kirchhoff approximation. The performance of the optimum uncertain field processor is successfully tested in two mismatch situations, where either the location of the receiver array or the dimensions of bottom features are imperfectly known. The degradation of the localization performance due to discrepancies between the actual and the assumed scattering surface is demonstrated. This surface difference is expressed as a nondeterministic microroughness layer characterized by its root-mean-square height and its correlation length. Sensitivity study results are presented as a function of these two parameters. [Work supported by the Office of Naval Research, Code 1125GG, through contract No. ONR-N00014-93-I-0049 and Code 11250A, through contract No. ONR-N00014-91-J-1448.]