VI. F. Summary of Projected Transportation System Characteristics (C. Mac Jones, Future Programs Office) 1. Introduction To understand the space transportation fleet traffic and implications thereof, a space transportation scenario was developed as associated with the SPS implementation scenario. The baseline SPS implementation scenario (Scenario "B") indicates one or more satellites will be brought on-line yearly over a 30-year period such that by the end of 2024, 112 SPS units will be operational at GEO. Figure VI-F-1 presents this baseline SPS implementation schedule. In addition, annual repair of the on-orbit operational SPS units represents a space transportation requirement above the construction-related requirement. The annual repair payload mass has been estimated as 1% of the on-orbit operational SPS mass. The operational requirements of the transportation system were considered for the three SPS systems options (column-cable/GEO, truss/GEO, and truss/LEO) in order to scope the transportation costs and other parameters for the baseline scenario. Maximum, nominal and minimum estimates of characteristics were made for each option by using all worst case estimates for minimum and characteristics judged "most likely" for nominal. The space transportation fleet has been characterized by four vehicles: (a) Heavy Lift Launch Vehicle (HLLV) - unmanned launches of al 1 cargo to LEO. (b) Cargo Orbital Transfer Vehicle (COTV) - LEO to GEO transfer of all cargo. (c) Personnel Orbital Transfer Vehicle (POTV) - LEO to GEO and return transfer of all personnel and optional high priority cargo to LEO. (d) Personnel and Priority Cargo Launch Vehicle (PLV) - manned launches of all personnel and optional high priority cargo to LEO. These vehicles have been described in detail in earlier sections in discussions of candidate configurations. Detail characteristics of the vehicles used in the scenario are outlined later in this section. The space transportation scenario logic involving operational aspects of the SPS and characteristics of the space transportation fleet was developed by the Future Programs Office in an illustrative example of the year 2014 of the SPS scenario. This basic logic was evolved into a
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