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D-5. Orbit Analysis Control Flow Diagram

Figure D-6. Orbit Analysis control flow diagram.

Figure D-6 indicates the time ordering of processes in Orbit Analysis. During the configuration of the system, databases are filled with mission- and vehicle-specific data.

Before a satellite contact, antenna tasking data is generated using the most recent ephemeris prediction and this data is sent to the RGF before or during contact.

Once new tracking data is available, this data is processed in preparation for orbit determination processing. The processed data are then used to update the vehicle state and any estimated parameters, After a quality assessment process is complete and any problems with the orbit determination process are identified and rectified, the process of generating ephemeris and associated events begins. During this process, another check is made to determine if any anomalous situations will arise.