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Abstract

Software in the Systems Engineering Simulator at NASA's Johnson Space Center must be updated frequently to insure reliability and accuracy of the simulation. The Attitude Control System of the Space Station Freedom is one large component of the station simulation which must likewise undergo upgrades and maintenance. The baseline McDonnell Douglas Space Systems Co. (MDSSC)/Honeywell Attitude Control System has been integrated into the laboratory as a new system rather than modifying the older, existing version. Because this was replacing the older version, testing and verification were simplified as the existing task interfaces could be retained. This prevented many errors while at the same time provided a realistic capability for the laboratory.

Keywords

Space Station control system pilot-in-the-loop spacecraft control

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References

Caldwell, B., et al. , "Space Station Simulation User's Guide: Dynamic Simulation Revision 1.2" Honeywell, 15 January 1991.

Kennel, H.F. , "Double-Gimbaled Control Moment Gyro (DGCMG) Steering Law Update," Marshall Space Flight Center (MSFC) MSFC letter ED12-86-52, 12 May 1986.

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Yeicher, J.A. , et al. , "Detailed Description and Implementation of Baseline Space Station CMG/MM/RCS Attitude Controllers," Honeywell, HSP SDRL- 108, 22 September 1989.

Real-Time Simulation of the Space Station Freedom Attitude Control System

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