Title

Application of high-resolution beamforming to multibeam swath bathymetry

Abstract

n the context of swath bathymetry with multibeam echo-sounders, seafloor echoes received at regularly spaced elements of a hydrophone array are summed coherently to form a number of directional beams from which athwartships depth measurements are derived. This process can be implemented as a conventional beamformer leading to estimates of the direction of arrival of the echoes for each time sample. The process is inadequate in resolving closely spaced synchronous returns and the accuracy of these estimates is proportional to the number of acoustic data samples used in the process. To improve the angular resolution we have considered a number of high-resolution algorithms well known in power spectral estimation applications: autoregressive techniques (i.e. Yule-Walker , and unconstrained least squares), minimum variance methods (i.e. Capon's method), and eigenanalysis algorithms (i.e. MUSIC). Comparisous of results obtained with realistic multibeam sonar siinulations show that these algorithms have higher accuracy and better potential for high-resolution bathymetry thau the conventional beamformer under nominal SNR levels.

Publication Date

10-1993

Journal or Conference Title

IEEE Oceans

Volume

1993, volume 2

Pages

77-82

Conference Date

Oct 18 - Oct 21

Publisher Place

Victoria, British Columbia, Canada

Publisher

IEEE

Digital Object Identifier (DOI)

10.1109/OCEANS.1993.326070

Document Type

Conference Proceeding