Variable Bandwidth Filter for Multibeam Echo-sounding Bottom Detection

Authors

Barbara J. Kraft, University of New Hampshire, Durham
Christian de Moustier, University of California - San Diego

Abstract

The accuracy of a seafloor map derived from multibeam swath bathymetry depends first and foremost on the quality of the bottom detection process that yields estimates of the arrival time and angle of bottom echoes received in each beam. Filtering of each beam with a fixed bandwidth filter, with the bandwidth based on the length of the transmitted pulse, reduces the error associated with the time-angle estimates. However, filters of this type can not be optimal over the wide range of operational environments encountered. Better results are obtained with a processing scheme that varies the filter bandwidth across the swath width using detected time and angle information from the previous ping. This method is evaluated using sonar data obtained with a Reson SeaBat 8111ER and the results compared with those obtained using a fixed bandwidth filter.

Department

Center for Coastal and Ocean Mapping

Publication Date

11-2004

Volume

2

Journal Title

IEEE Oceans

Pages

1154-1158

Conference Date

Nov 9 - Nov 12, 2004

Publisher Place

Kobe, Japan

Publisher

IEEE

Digital Object Identifier (DOI)

10.1109/OCEANS.2004.1405672

Document Type

Conference Proceeding

Recommended Citation

B. J. Kraft and C. P. de Moustier, "Variable bandwidth filter for multibeam echo-sounding bottom detection," Oceans ’04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600).