1 . ROCKWELL INTERNATIONAL The following is a description of the SPS concept produced by Rockwell International under contract to the NASA Marshall Space Flight Center. A documentation roadmap is provided at the conclusion of this section to aid the reader in locating more detailed information from study reports. A. Guidelines and Assumptions The guidelines and assumptions for this study were essentially the same as for the Reference System. B. System Overview The system definition includes satellite, ground and space systems, and transportation and their relationship. The satellite system concept is illustrated in Figure R-l. Solar energy is converted to electrical energy using solar arrays having reflectors that concentrate the energy onto the solar cells. The solar cells convert the solar energy to de electrical energy which is conducted to a centrally located microwave antenna. The microwave antenna transforms the de power to RF microwave. Key features of this design concept include use of concentrators (CR=2), galliumal uminum-arsenide solar cells, three trough configuration designs, tension web/ compression frame antenna structure, klystron dc-RF microwave converters, aluminum structural material, a single, center mounted antenna, GEO construction, 45.5 kV power distribution, and subarray phase control. Each rectenna is designed to accept power from a single satellite and provide 5 GW of power to the utility interface. A typical rectenna site located at 34°N latitude covers an elliptical area 13 km in the north-south direction by 10 km in the east-west direction. This area provides an active intercept area of 78.2 km . A phased array comprised of strip line patterns of bow-tie dipoles was selected. This selection was based primarily on the increased efficiency and decreased diode count obtained using this approach. The support structure employs preformed hat sections, standard I-beams, and 3.5 inch diameter tube braces. The I-beams and braces support the structure on concrete piers.
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