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1.2 Purpose

The initial version of this architecture has been applied as a technical baseline in program office planning. Included in these planning efforts was the evaluation of several Government Furnished Equipment (GFE) TT&C systems being considered as the baseline for the development of a common core to be incorporated into the mission ground systems for all AFSPC programs. The architecture development team identified a set of architecture-related criteria that were applied in evaluation of the candidate systems.

The next application is the evaluation of the actual core system architecture. The Distributed Command and Control System (DCCS) is the TT&C system chosen as the initial baseline for development of the core. This reference architecture provides a baseline against which to compare the DCCS architecture, identify differences, and identify options that will allow DCCS to evolve to meet the more general requirements of the core TT&C system. In addition, this evolution should promote increased interoperability with the mission control segments developed by the SPOs. Obviously, problems may be found with this reference architecture, but it is hoped that the comparison activity will correct them as well. Additionally, this architecture will be used to facilitate discussions with satellite programs regarding the core and how it can be incorporated into their overall mission ground systems.

This reference architecture will provide a baseline for development of an Independent Cost Estimate (ICE) for the Engineering Change Proposal (ECP) to the Network Operations Upgrade Contract (NOUC) that will evolve DCCS into the core. This architecture and the results of DCCS comparison effort will allow us to fill in the implementation details and derive a fairly accurate ICE.

Finally, it is hoped that the experience gained from developing this architecture will permit us to contribute to an effort by the Advanced Research Project Agency (ARPA), the University of Southern California (USC), and The Aerospace Corporation to standardize ground systems architectures. This architecture represents a very good start toward standardization and the architecture development team has the TT&C domain expertise to continue development of a set of national standards for ground system processing of satellite command and control data.