1-1 Study task structure............................................................ 1-4 III-l Projections of U.S. electrical energy requirements and possible SPS implementation scenarios .... III-2 IV-1 SPS functional description .................................................. IV-1 IV-2 Estimated efficiencies of the various steps in the collection, conversion, and transmission process .... IV-3 IV-3 Output power limits ............................................................. IV-4 IV-4 Power density at rectenna ................................................... IV-7 IV-5 Eclipse geometry .................................................................... IV-8 IV-6 Example configurations (a) Column/cable............................................................ IV-10 (b) Truss......................................................................... IV-10 IV-7 Solar power satellite total mass ......................................... IV-13 IV-8 Solar concentrator ................................................................ IV-16 IV-9 Solar cell blanket................................................................ IV-17 IV-10 Gravity gradient torques (a) Short period............................................................ IV-19 (b) Long period............................................................... IV-19 IV-11 Counterweight location .......................................................... IV-20 IV-12 Antenna element.................................................................... IV-24 IV-13 Typical antenna distribution system ..................................... IV-25 IV-14 Antenna primary structure ................................................... IV-26 IV-15 Ball joint and drive concept................................................ IV-27 IV-16 Rectenna construction .......................................................... IV-29 IV-17 Variation in ground de power output ..................................... IV-30 IV-18 Photovoltaic array cost projection ...................................... IV-33 FIGURES
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