Document Type

Conference Proceeding

Publication Date

2013

Department

Marine Science

Abstract

For shallow water surveys, accuracies achievable from phase differencing swath bathymetry systems are approaching those of multi-beam systems. Advantages of phase differencing systems include wider coverage, which increases efficiency, and simultaneous depth/side scan sonar imagery, making them ideal for very shallow water surveys. Before these systems can gain wider acceptance in the hydrographic surveying community, rigorous accuracy analysis must be performed and reasonable uncertainty models developed. The University of Southern Mississippi’s Hydrographic Science Research Center conducted an evaluation of their EdgeTech 4600™ 540 kHz phase differencing system in comparison with their Reson Seabat 7125™ beam forming system. The survey was designed specifically for this analysis where lines were run with very narrow spacing and both forwards and backwards. Data from both systems were collected simultaneously from the same survey platform. A reference surface was developed from the Reson data and used to evaluate the EdgeTech data.

This paper outlines the similarities and differences between phase differencing and beam forming systems. It discusses the data collection and analysis procedures and presents the results.

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