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《Lect_26_paper_ihr03》.pdf
International Hydrographic Review Hughes Clarke
Dynamic Motion Residuals in Swath Sonar Data :
Ironing out the Creases
John E. Hughes Clarke
Ocean Mapping Group
Dept. Geodesy and Geomatics Engineering
University of New Brunswick
Canada
jhc@om g.unb.ca
Abstract
As the component sensors in swath sonar systems have improved, the focus on total
system performance has turned increasingly to the remaining imperfections in the system
integration. Of particular concern is that faint but systematic across track ribbing often
remains in otherwise high-quality data.
Traditional field calibration procedures primarily look for the signature of static
systematic error contributions. These procedures (the conventional patch test) only
examine a subset of the possible systematic biases in the configuration of an integrated
swath sonar system. Other systematic biases can cause dynamic rather than static
signatures in the resulting bathymetric data.
These dynamic errors can be separated into those that produce errors that vary with
periods in the ocean wave spectrum (most commonly referred to as the “wobbles”) and
those whose period is dictated by the long period accelerations of the vessels (turns and
other course changes, obstacle avoidance and speed changes).
Herein the theory behind the cause for a number of common wobble sources is examined.
For the case of shallow water surveys, where the ping period is short with respect to the
typical wave period, the wobble signatures can be easily discerned. The differences in the
signatures of each of the wobbles are highlighted allowing rapid classification and thus a
means of removal of the underlying systematic bias.
Introduction
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