| Abstract: | Given that the edge beam of the multibeam bathymetric strip is affected by various errors like motion errors and sound velocity profile bias and its data quality is poorer than that of the central beam, we have proposed a model to correct the rolling motion residual of the edge beam of multibeam bathymetry using the overlapping area of adjacent survey lines to improve data quality of them. Specifically, we employed the matching interpolation model of the bathymetry points along the heading to match the bathymetry points of the central beam with those of the edge beam, and obtained the bathymetric error value of the edge beam. Then, we adopted the residual correction model of the rolling motion to compensate for the beam incidence angle that considers the attitude angle. Finally, based on calculating the residuals of rolling motion, we analyzed and inverted the relationship between the residuals of rolling motion and the rolling data. The calculation results indicate that the proposed model can accurately extract the bathymetric error values of the edge beam, and the corrected seabed topography eliminates the undulation caused by errors, thus effectively weakening the impacts of various errors on the edge beam and providing valuable application references for practical engineering. |
