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Shuttle program. Onorbit navigation integrator results for typical shuttle orbitsThree types of navigation onorbit numerical integrators were evaluated: (1) power integrators with no delta-V incorporation, just coasting (using Taylor series expansion integrators); (2) coasting integrators using the Cowell method of special perturbations; and (3) coasting integrator using the Pines variation of parameter perturbation method. Results show that the super G integrator is a very simple and effective for 2 and 4 second time steps. Since IMU delta-V data can be easily incorporated in the integration scheme, its use as the standard onorbit navigation propagator for the maintenance of the current state was implemented in the onboard navigation software. The Pines formulation method with a Runge-Kutta-Gill fourth-order integrator method produces excellent results up to 300 second time steps. On orbit prediction with this method was implemented in the onboard onorbit navigation scheme. The Runge-Kutta third order, using Cowell's method, is an excellent general purpose determination integrator for time steps up to a 60 second duration.
Document ID
19800018906
Document Type
Technical Memorandum (TM)
Authors
Olszewski, O. W. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1979
Subject Category
SPACE TRANSPORTATION
Report/Patent Number
JSC-16011
NASA-TM-81092
REPT-79-FM-25
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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