Patch Test: A Theorical and Practical Review
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Abstract
The appearance of multibeam systems combined with the rapid development of the technology of the various sensors and auxiliary components had led to more robust and accurate surveys. However, the incorrect installation, alignment or synchronization of the bathymetric instrumentation can depreciate the bathymetric data overly. For multibeam systems, a widely used calibration procedure consists of the patch test. This procedure appoint relative residual angles between the angular measurement sensors and the transducer, in order to correct possible deviations from the vessel's dimensional control. Despite being quite widespread and widely used, theoretical and practical divergences are still observed. Therefore, the objetive of this study is to present a theoretical and practical review of the patch test methodology, assessing divergences in the final calibration product, as the processing sequence and form changes. For this, hydrographic data were collected in two different locations and the calibration process was carried out using two approaches, varying the processing sequence. In the first approach, residual offsets were determined using mathematical equations, evaluating the correspondence between bathymetric surfaces. The second approach consisted of a qualitative and graphical assessment, usually employed by hydrographic software.
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