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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
IWAKEinstrumentation systems for on-board wake vortex
and other hazards detection, warning, and avoidanceS. Rahm, DLR
Thales Avionics (F, coordinator) data unit
Airbus Deutschland GmbH (D) simulator
DLR (D) lidar (CTI) + long range data unit
NLR (NL) aircraft + simulation
University of Hamburg (D) 2 m laser development
LISA Laser (D) 2 m laser development
Université catholique de Louvain signal processing
Fraunhofer IOF of Jena (D) scanner
start : 01/05/02; end : 31/04/05; Contract no.: G4RD-CT-2002-007788
nstrumentation systemsfor on-board
vortexand other hazards detection,
warning and avoidance
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
IWAKE: NLR Cessna with “Bubble” and scan geometry
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Scanning range: 3° vertical x 12° horizontal; 75 horizontal linesCenter of scan : 9° to the right und 9° to the ground with respect to aircraft axisDuration of one scan: 5 s / pattern + 1 s flyback=> 66 ms / line with approx. 33 shots @ 500 Hz PRF
Scan Pattern
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
IWAKE instrument (DLR part with IOF scanner)
lidar + cooling data rack
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Installation in NLR Cessna
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Inside Cessna Citation
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
“Scanner Bubble”
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Flights in the area of Toulouse:
June, 22: LTA wake vortex flight
June, 23: long range wind
June, 25: LTA wake vortex flight
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
LTA wake vortex measurements 25/06/2004
The wake vortex is moving from the right to the left side blue at the LOS plot and green/yellow at the spectral width
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
LOS detection field
2120
2000
1880
1760
1640
1520
1400
1280
1160
1040
920
800
Range [m]
LTA wake vortex measurements 25/06/2004preliminary results from UCL TELE (Belgium)
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Long range measurements 23/06/2004LOS wind speed (top)+ difference between range gates (bottom)
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Long range measurements 23/06/2004 (zoom)
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Long range measurements 23/06/2004correlation at different range gates
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Working Group on Space-Based Lidar Winds; Sedona Feb. 2005
Conclusion
- IWAKE demonstrated axial detectability of wake vortices- Clear air turbulence: Correlation between turbulence and acceleration needs exact LOS along flight track
Groundbased + airborne A380 wake vortex measurements planned at DLR for this year (other project).
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