Figure 3-2 The 1979 DOE-NASA Solar Power Satellite Study Refenice System SRS-’79: Space Segment. The “Reference System” concept space segment is a single, large-scale GEO- based, RF-transmitting space solar power system. Each SPS resembles a large, planar structure 5 km x 10 km in size, and covered with PV arrays. This platform is continually sun-pointing. At one end of the platform is a 1 km diameter RF transmitter with a mechanical coarse pointing system and very narrow phased-array electronic beam steering for fine pointing. This transmitter is always Earth-pointing. The concept is assumed to transmit at 2.45 GHz from an operational GEO location, at a transmitted power level of 5 GW RF. The fundamental structural concept used is an erectable, compression-stabilized truss structure with (typically fabricated from composite materials). This system is anticipated to be somewhat modular and capable of on-site repair. Heat rejection for power conversion and conditioning systems is assumed to be largely active cooling. In-Space Infrastructure. A unique in-space infrastructure is required for system deployment, including a very large-scale LEO-based construction space station at which approximately 500-1000 astronauts would construct SPS. All associated systems (e.g., habitats, etc.) must be provided. Also, a very large- scale, extremely affordable LEO-to-GEO in-space transportation system is enabling for this concept.
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