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E-5. Attitude Analysis Control Flow Diagram

For attitude determination, data associated with configuration of onboard sensors is defined and stored for access during real-time, operational activities. The contents of this data store should not be altered unless a database change is requested due to observations recorded while on-orbit.

At the conclusion of an RGF contact, the sensor observation data is processed to estimate the inertial attitude of the spacecraft. Results of the attitude determination process can be recorded in many coordinate frames including right ascension and declination, Cartesian, and instantaneous roll/pitch/yaw.

On completion of the attitude determination process, the quality of the solution is assessed. If statistics associated with the attitude solution indicate a low measure of confidence, an evaluation of processed data can be performed. If the quality assessment meets operational requirements, products associated with the Attitude Ephemeris and Events data store (i.e., transmission angles, sensor predictions, sensor events, sensor intrusions etc.) may be generated.

The attitude ephemeris and events data will allow updates to the mission timeline and contact support plans, as well as prediction and diagnosis of any anomalies associated with the spacecraft's attitude state.

Figure E-5. Attitude Analysis control flow diagram.