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Ares I-X Best Estimated Trajectory and Comparison with Pre-Flight PredictionsThe Ares I-X trajectory reconstruction produced best estimated trajectories of the flight test vehicle ascent through stage separation, and of the first and upper stage entries after separation. The trajectory reconstruction process combines on-board, ground-based, and atmospheric measurements to produce the trajectory estimates. The Ares I-X vehicle had a number of on-board and ground based sensors that were available, including inertial measurement units, radar, air- data, and weather balloons. However, due to problems with calibrations and/or data, not all of the sensor data were used. The trajectory estimate was generated using an Iterative Extended Kalman Filter algorithm, which is an industry standard processing algorithm for filtering and estimation applications. This paper describes the methodology and results of the trajectory reconstruction process, including flight data preprocessing and input uncertainties, trajectory estimation algorithms, output transformations, and comparisons with preflight predictions.
Document ID
20110014643
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Karlgaard, Christopher D. (Analytical Mechanics Associates, Inc. Hampton, VA, United States)
Beck, Roger E. (Analytical Mechanics Associates, Inc. Huntsville, AL, United States)
Derry, Stephen D. (NASA Langley Research Center Hampton, VA, United States)
Brandon, Jay M. (NASA Langley Research Center Hampton, VA, United States)
Starr, Brett R. (NASA Langley Research Center Hampton, VA, United States)
Tartabini, Paul V. (NASA Langley Research Center Hampton, VA, United States)
Olds, Aaron D. (Analytical Mechanics Associates, Inc. Hampton, VA, United States)
Date Acquired
August 25, 2013
Publication Date
August 8, 2011
Subject Category
Avionics And Aircraft Instrumentation
Report/Patent Number
NF1676L-11960
Meeting Information
Meeting: AIAA Atmospheric Flight Mechanics Conference
Location: Portland, OR
Country: United States
Start Date: August 8, 2011
End Date: August 11, 2011
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 206518.02.50.02
Distribution Limits
Public
Copyright
Public Use Permitted.

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