Publications [#66708] of Jeffrey L. Krolik

Papers Published

1. Krolik, Jeffrey L. and Hodgkiss, William S., Matched field source localization in an uncertain environment using constraints based on sound-speed perturbations, Oceans (New York), vol. 2 (1991), pp. 771 - 778, Honolulu, HI, USA
   (last updated on 2007/04/16)

   Abstract:
   Matched field source localization methods can be seriously degraded due to errors in modeling the propagation characteristics of the ocean channel. A maximum likelihood (ML) matched field beamformer is presented which achieves greater robustness to model mismatch caused bay uncertainty in the sound-speed profile between the source and receiver. The proposed modification of the standard ML beamformer consists of using multiple linear constraints derived from predicted pressure fields obtained using a set of perturbed sound-speed profiles. To investigate the nature of wavefront variations due to random sound-speed perturbations, a normal mode model based on adiabatic and first-order perturbation approximations is examined. This model suggests that the dimension of the new beamformer's signal constraint space can be small for moderate source ranges and sound-speed variations. Simulation results in a realistic deep-water Pacific ocean environment are reported which suggest that unambiguous source location estimates can be achieved at low frequencies with a sound-speed profile mismatch as large as 5 meters/second.

   Keywords:
   Sound;