A quantitative assessment of how MRU misalignment affects

MBES patch test results with varying weather conditions

Oliver Maddock

Create an up to date Dimcon survey of the Falcon Spirit.

Calculate the MRU misalignment angle.

Run survey with, without and exaggerated corrections and survey with varying weather conditions.

Statistically analyse processed data and draw conclusion.

Objectives

CRP – Common Reference Point

DIMCON- Dimensional Control survey

DTM – Digital Terrain Model

MBES – Multibeam Echo Sounder

MRU – Motion Reference Unit

SBET – Single Best Estimate Trajectory

SRF – Ships reference frame

Abbreviations

DIMCON

MRU

[1]

Proposed Methodology

Two surveys sites

• MRU misalignment angles • Varying weather conditions

Proposed Sites

[2]

Misalignment angles

[2]

Varying Weather conditions

[2]

MRU misalignment angle

POSPac (SBET)

QINSy (MBES data + SBET)

Qimera (DTMs)

MBES Calibration values

Processing data

Processing MBES data

[3]

Final DTM

[4]

MRU Misalignment angle

Produce processed DTMs for comparison

Statistical analysis processed data

Predicted Conclusion

Thank you for listening

Any Questions?

[1]- Eisenberg, J., Davidson, M., Beaudoin, J. and Brodet, S., (2011), April.

Rethinking the patch test for phase measuring bathymetric sonars. InProceedings: US Hydrographic Conference, Tampa, FL (pp. 25-28).

[2] -Admiralty charts http://digimap.edina.ac.uk/roam/marine [date accessed: 7/4/2016]

[3]- QINSy http://www.qps.nl/display/qinsy/multibeam [date accessed: 7/4/2016]

[4]- Hare, R., (2015). Depth and Position Error Budgets for Mulitbeam

Echosounding. The International Hydrographic Review, 72(2).

References