présentation powerpoint - ensta bretagne › moqesm2018 › speech_adam.pdf · • ins performance...
TRANSCRIPT
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INS, Inertial Navigation Systems
LBL, Long BaseLine acoustic positioning systems
USBL, Ultra Short BaseLine positioning systems
LBL USBL
INS
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• INS performance depends on:
• Inertial sensor class
• Aiding sensor nature (USBL, LBL, DVL…)
• Travelled distance / trajectory (DVL, sparse)
• INS-DVL position accuracy is specified in percent of the travelled distance (% TD) Pure
inertial mode
0.15deg
0.05deg
0,3% DT
Heading (rms)
Roll & Pitch (rms)
Position With DVL
(CEP50)
Pure inertial mode
0.01deg
0.01deg
0,1% DT
Pure inertial mode
0.05deg
0.01deg
0,2% DT
PHINS COMPACT C3
PHINS COMPACT C5
PHINS COMPACT C7
8
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• In LBL mode…
Ranging measurement to fixed transponders
Algorithm calculates the resulting position
Possible combination with inertial navigation system:
• Robustness
• Sparse array navigation
• Increase positioning accuracy
• L Require to deploy fixed transponders on the seabed
• L Require to box-in the fixed transponders
• J Decimetric positioning accuracy whatever the water depth
• J Autonomous positioning method
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• In USBL mode …
Slant range + bearing estimation
Estimation of the position of the transponder
Possible combination with inertial navigation system:
• Robustness
• Increase positioning accuracy
• J Does not require to deploy fixed transponders on the seabed
• J Does not require to box-in the fixed transponders
• L Positioning accuracy is a % of slant range (typically 1m at 1,000m WD)
• L Position of the transponder is known remotely
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• Master each technology individually
• Combine them and provide a robust system
• Reach simplicity and performance
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Full range INS for all applications
Long range USBL positioning system
The fully integrated, portable and pre-calibrated USBL for universal applications
An Acoustic Synthetic BaseLine positioning system, a complementary approach to LBL
Low or medium frequency transponders to operate with iXblue acoustic systems
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Ranging and communication capability (telemetry : 500bits/s interlaced with positioning
cycle ; modem : 10kbits/s apart from positioning cycle)
4,000 m water depth, deeper optional, corrosion resistant
Extremely low-power consuming for extended deployments (2-year listening life or in
excess of 1,000,000 acoustic pings)
Compatible with iXblue products range (GAPS, RAMSES)
Internal / external environment sensors and embedded data logger
Configuration through WiFi communication / embedded Web_MMI software
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Positioning system: full LBL or sparse LBL (INS interfacing)
Decimeter accuracy
4,000 m water depth, deeper optional, corrosion resistant
Acoustic telemetry
Embedded data logger
Battery backup
Internal / external environment sensors included in base configuration + optional sensors
User interface (Web_MMI software) through WiFi communication
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Real time picture
Post processed picture
Based on DelphIns short term and long term replay
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• Reduction of the number of transponders on
the seabed without compromise on
performance
• Robust and efficient acoustic data link
between subsea devices and from subsea to
surface
• Performant and field proven hardware
Picture on the right : Drix
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Principle
• Transponder fitted with docking interface
• Coupling with IMU 50
• Deployment on the structure
• Gathering of data (immersion, HRP,…)
• Recovery of the transponder
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Context
• The FPSO collect the oil channelled by the
riser
• The FPSO is anchored to the sea floor
• The riser is subject to movements of FPSO
and current drag
Purpose
• Monitoring of riser movements
FPSO – Floating production storage and offloading
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Principle
• Instrumentation of Riser (integration of
ADCP)
• USBL positioning
• Data recovery :
• Depth
• Roll, Pitch
• Current
USBL
Riser
*ADCP
*ADCP – Acoustic Doppler Current Profiler
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• Network made of 5 transponders
• Ranges measured between transponders every hour
• Data recovery : 1 to 3 times per year
• Measuring campaign : 3 to 4 years long
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Principle
• Deployment of the transponders
• Network calibration
• Ranges measurement
• Data recovery
• Data processing
• Recovery of the transponders
Purpose
• Monitoring of tectonic shifts (a few mm per
year)
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