Adaptive Noise Canceling Applied to Sea Beam Sidelobe Interference Rejection

Abstract

Sidelobe interference has been a source of difficulty in the study of seafloor acoustic backscattering properties based on Sea Beam acoustic records. The filtering scheme used in Sea Beam adversely affects the underlying acoustic return and may also lead to bathymetric artifacts. Adaptive noise canceling (ANC) offers the potential for sidelobe interference cancellation coupled with signal preservation, provided both amplitude and phase information are available. The joint-process deterministic least-squares lattice is the adaptive filter of choice because of its superior transient response in the presence of power discontinuities. A REVGEN simulation of the Sea Beam system provided support for the proposed filtering technique. A complex data acquisition system was designed and built to record the in-phase and quadrature component of Sea Beam returns. Initial ANC processing of these recorded Sea Beam data provided satisfactory sidelobe interference cancellation with no noticeable degradation of the actual bottom returns.

Department

Center for Coastal and Ocean Mapping

Publication Date

4-1988

Volume

13, issue 2

Journal Title

IEEE Journal of Oceanic Engineering

Pages

70-76

Publisher Place

Washington DC, USA

Publisher

IEEE

Digital Object Identifier (DOI)

10.1109/48.556

Document Type

Journal Article

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