Elements • Flight Systems/Subsystems - Power Transmission - Solar Collection & Conversion - Energy Storage - Attitude & Orbit Maintenance - Thermal Control - Telecommunications & C/DH - Structure & Hamess • Orbit Geometry • Manufacturing • Input/Output - Input Worksheet - Output Summary - IAAM Interface • Databases - SSP Concept Configurations - Market Segment/City Locations Functions • Flight Systems/Subsystems Computes mass and cost of each system or subsystem based on user selected technologies, performance requirements, and production pricing where applicable. • Orbit Geometry Computes daily contact times and distances between satellites, relays and selected ground sites. • Manufacturing Computes production adjusted prices and related manufacturing investment cost. • Input/Output Provides interaces with user and IAAM model as well as hard copy summary. • Databases Provides configuration default values for each SSP concept; latitude and longitude for cities in each market segment. Figure 4-1 Space Segment Model Elements Selection of up to 25 ground sites can be performed directly on the Summary worksheet by simply entering the site name, latitude and longitude in the appropriate cells of the worksheet table. Alternatively, the sites can be copied, either individually or as a group, from a database of site locations organized by market sector on the following five SSM worksheets: Mega-City, Chy, Mega-Town, Town, and Remote. Other inputs to the model must be entered by way of the Input worksheet, which is the primary user interfree for performing analyses and evaluating options. The Input worksheet will be described in greater detail when discussing model operation, but in general it should be noted that h employs a quasi menu-driven approach to the selection of key system and configuration parameters for both solar power satellites and relays, as well as for the power reception equipment at the ground sites. Many of the input options reflect choices the user can make pertaining to devices, technologies, orbital specifications and other parameters culled from trade space investigations conducted in the Phase I study. To avoid the necessity of entering a full set of input data each time a run is made, a worksheet containing a Configuration Option Database is used to provide default values for each input parameter once a particular SSP concept is selected. Of the remaining SSM worksheets, most are directed to the evaluation of the required mass and cost of various subsystems that comprise the solar power satellite and/or relay satellite concepts being addressed. These include separate worksheets for Power Transmission; Energy Storage; Solar Collection/Conversion; Guidance, Navigation and Control; Thermal Control; and worksheets combming Communications and Command/Data Handling; and Structure and Hamess. The key subsystem characteristics and options addressed by the model are indicated in Figure 4-2, below their corresponding worksheet block. Two additional worksheets, overarching those above, are Orbital Geometry and Manufrcturing/Production. All of these worksheets are described and discussed in detail below.
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