Barbre, B. J.

Leahy, Frank

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SPACE LAUNCH SYSTEM
National Aeronautics and Space Administration 
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Time Correlated Wind/Atmosphere Profile 
Database for NASA DOL Assessments
Frank Leahy, MSFC/EV44, Natural Environments Branch
BJ Barbré, Jacobs Space Exploration Group, MSFC Natural Environments
Natural Environments Day of Launch Working Group
April 24, 2019
https://ntrs.nasa.gov/search.jsp?R=20190020099 2019-08-31T13:32:38+00:00Z
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Background
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• MSFC Natural Environments previously developed multiple databases 
for SLS and Orion MPCV ascent assessments:
– KSC Seasonal Atmospheric Profile Triplets
• Sumer, Transition, and Winter seasons
• 4000 triplets per season
• L-2, L-1, L-0
– KSC Seasonal Atmospheric Profile Quintuplets
• Summer, Transition, and Winter seasons
• 2000 triplets per season
• L-2, L-1, L-0, L+1, L+2
• The L-0, L+1, and L+2 profiles are a subset of the triplets
• DOLILU Integrated Ad Hoc Team (DOLIAHT) requested a more robust 
database, which could be used to assess multiple time lines, and to 
develop knockdowns for various time intervals
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KSC Seasonal Atmospheric Profile Duodecaplets
3
• Decision was made to develop a set of 12 profiles (duodecaplets)
• Profiles are separated by 30 minutes from L-3 to L+2
• An additional profile is added at L-6
• L-6, L-3, L-2.5, L-2, L-1.5, L-1, L-0.5, L-0, L+0.5, L+1, L+1.5, L+2
• MSFC has large database of spliced 915 MHz and 50 MHz Doppler Radar Wind Profiler 
(DRWP) wind profiles
• Select as many duodecaplets as possible for each season
– Summer: 5550
– Transition: 3799
– Winter: 3715
• All DRWP profiles reach at least 15 km, with a max of 18.45 km
• DRWP profiles are spliced into Earth GRAM generated wind profiles up to 250 km
– Wind value at the top of the L-6 profile is used to initialize Earth GRAM
– Correlated profile function within Earth GRAM used to generate subsequent profiles
– Ran the same process which was used to develop the triplets and quintuplets
• Thermodynamic profiles (temperature, pressure, and density) are generated from Earth 
GRAM
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KSC Seasonal Atmospheric Profile Duodecaplets
4
• Monthly distribution of the duodecaplets for each season (first profile, L-6)
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KSC Seasonal Atmospheric Profile Duodecaplets
5
• Hourly distribution of the duodecaplets for each season (first profile, L-6)
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KSC Seasonal Atmospheric Profile Duodecaplets
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• Summary
• Seasonal duodecaplets generated for use in DOL assessments
– Summer: 5550
– Transition: 3799
– Winter: 3715
• Number per season can be cut down if desired (e.g., 2000 per season)
• Minimum time between duodecaplets not considered
• Questions?


Time Correlated Wind/Atmosphere Profile Database for NASA DOL Assessments

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