Move a position reference frame to the work deck. Presentation by Nicolàs de Hilster (Starmountain Survey and Consultancy) en Erich Gaickhorst (GeoVisie).
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Inverted heading calibration
1. N. de Hilster
E. Gaikhorst
HSB Workshop Vessel Geometry and Calibrations
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The Inverted Heading Calibration:
a field case
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2. Project Outline
Create a copy of the reference
marble on the aft weather deck.
Required heading accuracy: 3'
(0.05°)
While being afloat!
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4. Or direct?
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5. Project Solution
No direct line of sight
Traversing not possible
Solution: the inverted
heading calibration
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7. Autocollimation Set
Tilting base for T2
Groove for FOG pins
Alignment accuracy: 0.002°
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8. Autocollimation Set
2D prism target
Alignment accuracy: 0.002°
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17. Quality Control
Post Alignment Check with dFOG
Independent survey of all six markers
Calculation of parallelism (target: 3')
Vessel
dHeading
dRoll
1
2.5' (0.72mm/m)
1.0' (0.29mm/m)
2
0.1' (0.02mm/m)
1.5' (0.44mm/m)
3
0.9' (0.25mm/m)
2.1' (0.61mm/m)
Average
1.1' (0.33mm/m)
1.5' (0.45mm/m)
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18. Conclusion
Accurate gyro's (FOGs) can be used
to transfer heading on dynamic
objects
Sensors of the highest accuracy are
required
Achievable accuracy approximately a
third of the FOG specification
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