on both a power and areal basis and the maximum of these two values is selected to produce a conservative estimate. It should also be noted that the non-recurring cost estimate for the photovoltaic technologies represent the cost of technology development solely and do not represent the non-recurring cost for the whole subsystem Outputs of this worksheet passed to the Summary worksheet include subsystem mass, non-recurring cost, and a production-adjusted recurring cost. Only the Power Satellite table receives these results, since the Relay Satellites, by definition, do not include a Solar Collection or Conversion function. Computational results for subsystem mass and area are passed to the worksheet covering the Guidance, Navigation and Control subsystem, since they play an important role in defining those requirements 4.3.4. Guidance, Navigation & Control This subsystem model includes mass and cost estimates of the attitude (pointing) and orbit control functional requirements for each of the candidate SSP system concepts and architectures. Subsystem components include a suite of sensors (sun/star/horizon trackers, IMU, GPS), data processors, and control effectors (momentum wheels, CMGs, and thrusters). Propellant mass for chemical or electric
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