Verification of the Space Shuttle entry GN&C systemThe certification procedures for the initial Shuttle flight are discussed. Particular attention is paid to the entry guidance, navigation, and control (GNC) verification, comprising tests, analysis, demonstration, inspection, and simulation. Flow diagrams for the verification and operational flight sequences are provided, along with a block diagram of the GNC circuitry interfaces. The development of the test matrix software for the GNC is outlined, noting the constant interplay between software verification and spacecraft reconfiguration to meet simulated performance requirements. Comparison of GNC performance predictions with actual entry flight data showed a good match in all performance areas except for sideslip excursions, bank overshoots, an area of transonic buffet, and an increased lift/drag ratio in the preflare to landing flight phase.
Document ID
19820030348
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Van Hoften, J. D. A. (NASA Johnson Space Center Houston, TX, United States)
Moyles, J. A. (Rockwell International Corp. Downey, CA, United States)