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National Aeronautics and Space Administration

Goddard Space Flight Center

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Engineering Flight Summary




TWiLiTE was integrated in the ER-2 Q-Bay in February. All mechanical, electrical and thermal interfaces were checked and initial flights revealed several issues requiring some rework. In September, more than 20 hours of engineering flight data were collected and all functions of the lidar including autonomous data collection, etalon calibration, auto-boresight and alignment of the laser and telescope were tested.



The previous image depicts an example flight track from Feb 15, 2011 This was a 6 hour flight from Palmdale , CA to Boulder, CO with ER-2 flying at 20 km. Approximately 3 hours were spent flying a diamond pattern with North, South crossing legs centered on sounding site just North of Denver. Ground validation iavailable ncludes multiple radiosonde launches, Vaisala and NOAA profilers.

TWiLiTE LOS wind profiles from Feb 14, 2011


Winds, February 14

TWiLiTE LOS wind profiles from Feb 14, 2011 ER2 test flight. A 10 minute segment taken over Fresno, CA is shown. Inset is a single TWiLiTE profile compared with wind profile data from the 00Z, Feb 15 NWS radiosonde launched from Oakland, CA.


February 14, 2011 flight over Calfornia Central Valley


February 14 Flight

Flight Test Modes: Fast Steering Mirror Alignment


Fast Steering Mirror

Flight Test Modes: Etalon Calibration


Etalon Calibration

Flight Test Modes: Science Data Acquisition


Science Data Acquisition

Feb 14, 2011 ER-2 Flight Track-Oakland NWS sonde comparison


Winds comparison

Feb 14, 2011 ER-2 Flight Track. The red sections represent the science collection flight mode.


Winds comparison

TRACK S1, February 14, 2011 flight over California Central Valley


Flight Track Winds s1
Flight Track Winds s1

TRACK S1, February 14, 2011 flight over California Central Valley


Flight Track s1
Flight Track Winds s1

TRACK S2, February 14, 2011 flight over California Central Valley


Flight Track s2
Flight Track Winds s2

TRACK S3, February 14, 2011 flight over California Central Valley


Flight Track S3
Flight Track Winds S3

TRACK S4, February 14, 2011 flight over California Central Valley


Flight Track S4
Flight Track Winds S4

Mission Status

The TWiLiTE Team is back from field work at Palmadale, California. Several engineering flights and a successful science flight were conducted aboard an ER-2.