cnotes11

D p d a o q n d m n q

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Unformatted text preview: y information from the strapdown inertial platform. Unsafe Behavior: At 36.75 seconds after H0, SRI detects an internal error and turns itself off (as it was designed to do) after putting diagnostic information on the bus (D). Control Algorithm: Calculates the Horizontal Bias (an internal alignment variable used as an indicator of alignment precision over time) using the horizontal velocity input from the strapdown inertial platform (C). Conversion from a 64−bit floating point value to a 16−bit signed integer leads to an unhandled overflow exception while calculating the horizontal bias. Algorithm reused from Ariane 4 where horizontal bias variable does not get large enough to cause an overflow. Process Model: Does not match Ariane 5 (based on Ariane 4 trajectory data); Assumes smaller horizontal velocity values than possible on Ariane 5. Backup SRI (Inertial Reference System): SRI Safety Constraint Violated: The backup SRI must continue to send guidance information as long as it can get the necessary information from the strapdown inertial platform. Unsafe Behavior: At 36.75 seconds after H0, backup SRI detects an internal error and turns itself off (as it was designed to do). Control Algorithm: Calculates the Horizontal Bias (an internal alignm...
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