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Flight data results of estimate fusion for spacecraft rendezvous navigation from shuttle mission STS-69A recently developed rendezvous navigation fusion filter that optimally exploits existing distributed filters for rendezvous and GPS navigation to achieve the relative and inertial state accuracies of both in a global solution is utilized here to process actual flight data. Space Shuttle Mission STS-69 was the first mission to date which gathered data from both the rendezvous and Global Positioning System filters allowing, for the first time, a test of the fusion algorithm with real flight data. Furthermore, a precise best estimate of trajectory is available for portions of STS-69, making possible a check on the performance of the fusion filter. In order to successfully carry out this experiment with flight data, two extensions to the existing scheme were necessary: a fusion edit test based on differences between the filter state vectors, and an underweighting scheme to accommodate the suboptimal perfect target assumption made by the Shuttle rendezvous filter. With these innovations, the flight data was successfully fused from playbacks of downlinked and/or recorded measurement data through ground analysis versions of the Shuttle rendezvous filter and a GPS filter developed for another experiment. The fusion results agree with the best estimate of trajectory at approximately the levels of uncertainty expected from the fusion filter's covariance matrix.
Document ID
19960041500
Acquisition Source
Johnson Space Center
Document Type
Technical Memorandum (TM)
Authors
Carpenter, J. Russell (NASA Johnson Space Center Houston, TX United States)
Bishop, Robert H. (Texas Univ. Austin, TX United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1996
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
NASA-TM-111666
NAS 1.15:111666
Report Number: NASA-TM-111666
Report Number: NAS 1.15:111666
Accession Number
96N31437
Funding Number(s)
CONTRACT_GRANT: NCC9-547-90
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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