standpoint, construction in GEO has a number of advantages, however, transportation considerations utilizing high Isp systems may reduce overall costs. Additional study of critical parameters is required in order to select the construction location. 2. Construction Approach Guidelines and Criteria The following guidelines and criteria were used in development of the construction approaches and concepts: a. Simple repetitive elements or components will be fabricated in geosynchronous orbit by automated machines. b. Complex elements or components will be manufactured in modules on the ground for assembly into the SPS in LEO. c. Personnel will be used primarily in monitoring and inspection functions from a shirtsleeve environment. d. EVA capability will be provided for unique nonrepetitive tasks or for contingency operations. e. "Bootstrap" locomotion is the prime mode around the launch site. Free-flyers are too great a penalty for common usage. 3. Construction Steps The major steps in establishing a photovoltaic station without reference to sequence or phasing are as follows: a. Establish construction base. b. Assemble and checkout orbital construction equipment. c. Fabricate the solar array primary structure. d. Attach control system modules. e. Fabricate solar array secondary structure. f. Install solar cell blankets. g. Install concentrator sheets. h. Install power distribution system. i. Attach antenna gimbal and slip ring assembly. j. Install antenna drive system.
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