Concept 2: The "TRUSS" SPS configuration constructed and assembled primarily in GEO. Chemical COTV transportation from LEO to GEO. Concept 3; The "TRUSS" SPS configuration constructed and partially assembled in LEO with final assembly in GEO. Self-powered transportation from LEO to GEO. Program models have been developed for each of the preceding concepts to identify the following program requirements for each year. 1. SPS units constructed 2. Total SPS units on line 3. Mass to GEO and LEO 4. Operational base units implemented and total on line 5. Personnel in GEO and LEO for production and maintenance 6. New POTV, COTV, PLV, and HLLV units required 7. Personnel and cargo launch vehicle total flights and flight rate to LEO 8. Personnel and cargo orbital transfer vehicle total flight and flight rate to GEO 9. Personnel and cargo launch and orbital transfer vehicles fleet size The program models utilize the results of the systems analysis of the basic SPS elements conducted during this study. The guidelines and assumptions are listed in table VII-1. For each construction and configuration concept, a "nominal" weight and size SPS (sec. IV) was used in the calculations. The resulting program models are listed in tables VII-2 to VII-4. C. Mission Management Concept In developing a philosophy for an overall mission management concept that can satisfy the basic system requirements and conduct the program model as presented above, the following guidelines have been identified and assumed. 1. Personnel-operated and automated machines for manufacturing and construction tasks in space 2. Operations and control authority delegated throughout the ground- and space-based facilities 3. Program and overall operations and control authority maintained on ground 4. Dedicated synchronous satellite communications relay system In general, all past space programs and the approaching Shuttle Orbiter, Spacelab, and IUS Space Transportation System (STS) missions can be regarded as ground-based space operations; that is, the complement of
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