Multibeam Echo Sounders-IMU Automatic Boresight Calibration on Natural Surfaces. Issue 2 (4th May 2017)

• Record Type: Journal Article
• Authors: Seube, Nicolas; Keyetieu, Rabine
• Is Part Of: Marine geodesy. Volume 40:Issue 2/3(2017)
• Page Start: 172
• Page End: 186
• Publication Date: 2017-05-04
• Subjects: Boresight -- calibration -- inertial measurement system -- multibeam echo sounder; Marine geodesy -- Periodicals; Hydrographic surveying -- Periodicals; 526.99
• DOI: 10.1080/01490419.2017.1310156
• Languages: English
• ISSNs: 0149-0419

Abstract

ABSTRACT: This paper details a new boresight calibration method for multibeam echo sounder systems This method is based on an automatic data selection algorithm, followed by a boresight least squares adjustment This method, called MIBAC (MultiBeam-IMU Boresight Automatic Calibration), takes in input overlapping survey strips following a simple line pattern over a regular slope. We first construct a boresight error observability criterion, used to select automatically the most sensitive soundings to boresight errors. From these soundings, we perform a 3D adjustment of the boresight angle, thus taking into account the coupling between angles. From a statistical analysis of the adjustment results, we derive the boresight angle precision. Numerical results obtained with four different multibeam echo sounder systems are presented and compared to those of a patch test calibration method. Finally, we demonstrate the performances of MIBAC through a standard deviation along the surface normal approach computed by principal component analysis.