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.
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