Table 2.1 Summary of SPS Reference System Concept Generating Capacity • 5 GW DC output per SPS unit at the utility interface Operational Characteristics • Flat solar array with transmitting antenna on one end • Power collection at GEO Energy Conversion • Photovoltaic—single-crystal gallium aluminum arsenide or singlecrystal silicon Power Transmission • Microwave, phased-array transmitting antenna, klystron power amplifiers and slotted waveguide radiating elements Structural Material • Graphite composite Rectenna 2 • Subarray panel with~8 km active element area Space Construction • Construction at GEO Space Transportation • Heavy Lift Launch Vehicle (HLLV)—two-stage, vertical launch, winged, horizontal land-landing, reusable vehicles with 400 metric ton payload to low earth orbit • Personnel Launch Vehicle (PLV)—modified Space Shuttle orbiter with passenger module • Cargo Orbital Transfer Vehicle (COTV)—independent reusable electric- powered vehicle • Personnel Orbital Transfer Vehicle (POTV)—two-stage, reusable chemical fuel vehicle Earth Launch Site • Kennedy Space Center pending further study
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