One of the primary differences between FDOs and other MCC Flight Controllers is the intensive computational processing we perform as opposed to monitoring Orbiter systems and functions
FDOs use two primary computer systems
Mission Operations Computer (MOC)
"Stand-alone" and integrated applications on the DEC Alpha
Future plans have us transitioning (finally) from the MOC to a truly workstation-based, distributed architecture.
MOC Trajectory Processors
The Mission Operations Computer (MOC) is a mainframe-class computer.
Legacy code still remains from Gemini and Apollo programs
MOC trajectory processors can be categorized as:
State Vector and Ephemeris Maintenance
Maneuver Planning
Mass Properties Planning
Deorbit/Entry Planning
Acquisition Planning
Off-line Computing Capability
Trajectory Software Applications (TSA)
TSA resides on CCC DEC Alpha workstations
TSA provides the FDO with trajectory processors both available and not available on the MOC and is used for both pre-mission data generation and real-time support
Some of the additional capabilities provided are: deorbit opportunities, runway and surface wind evaluation, enhanced rendezvous maneuver targeting, etc.
Other off-line computational capability exists utilizing the MCC PCs.
The FDOs make extensive use of ROSS and other CCC-provided functionality.
Orbit/Rendezvous
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