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EXIMU

EXIMU is an Abacus expert system used to monitor the set of three IMU's during the countdown process on launch day.  The Inertial Measurement Unit (IMU) is the principal sensor for inertial navigation on the Space Shuttle Orbiter.  Its performance level is critical to vehicle safety and to the successful accomplishment of mission objectives.  EXIMU implements a portion of the IMU surveillance tasks which are now standard procedure, and provides significant additional capabilities for detailed evaluation of IMU health and performance in real time.

EXIMU utilizes a data base of IMU calibration parameters and a stream of IMU telemetry data to verify IMU performance, alignment, and conditions at liftoff.  It reports these results to Shuttle launch control authority together with diagnostic conclusions and recommendations.



Arrangement of IMU's in the Space Shuttle Orbiter
EXIMU is an Abacus expert system used to monitor the set of three IMU's during the countdown process on launch day.
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16. EXIMU
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