2.0 SYSTEM DEFINITION The breakdown of SPS into system and subsystem elements presented below differs somewhat from other SPS documentation. We have, however, used the NASA Reference System Report for basic information on the Reference Design whenever possible. The Reference Design SPS was divided into seven major systems: (1) transportation system; (2) low Earth orbit (LEO) base; (3) geosynchronous Earth orbit (GEO) base; (4) power satellites themselves; (5) receiver antenna arrays (rectennas) and associated facilities on the ground; (6) command and control system; and (7) communications system. In general, whenever we refer to "SPS" or "Satellite Power System" in this report, we mean the entire system including all of the above elements. If we refer to just the power satellites themselves, we use the term "power satellite." As discussed in Section 1.4 before, it is necessary to consider two extreme cases: a SPS with enhanced military capabilities, and a SPS with minimized military support capabilities.(The Reference Design SPS represents the latter case.) To enhance the military usefulness of SPS, various adapters or modules would be added to, or incorporated into, SPS elements in order to carry out any of the three major missions of military organizations: (1) force delivery; (2) command, con- trol, communications, and intelligence (C3I); and (3) military support. A Satellite Power System with fully enhanced military capabilities would then have ten major systems, namely, the seven listed above for the Reference Design, plus adapters for each of the three major military missions just mentioned. These ten systems and their refinements into subsystem elements are shown in Table 2-1. Each of the system elements of the Reference Design in Table 2-1 will be described briefly in this section. We defer discussion of military systems and subsystems which might be added to SPS until Section 3. 2.1 Transportation Systems Brief descriptions of SPS transportation systems and operations are given here. A more quantitative summary of transportation parameters is presented in Table 2-2 which views the program at the midpoint of total system buildup, that is, when thirty 5 GW units are in place and operational, and construction is proceeding
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