for the SPS truss configuration was not made since the geometry of the truss offers the capability of centralizing construction base elements. Table V-B-6 shows the results of the column/cable comparison. Weighted values were assigned to 14 evaluation criteria. The criteria were given a weight value with respect to their importance for the configuration alternatives. A narrative description of each criteria is given below under the heading "Configuration Evaluation Criteria". Each evaluation criteria is given a rating of 1 through 5 for each configuration. The highest value is considered the "best" and the lowest value considered "poor". The total rating for each criteria is obtained by multiplying the weight value by the assigned rating number. Configuration Evaluation Criteria 1. Facility Operations. Pre and Post SPS Construction This item encompasses the level of overall efficient operation of the construction base, including interfaces with other orbital elements and transportation systems. Also, the degree of complexity of pre and post SPS construction with regard to construction base component buildup and subsequent base transfer to begin construction of other SPS satellites. 2. Traffic Pattern This area includes the design for internal (attached to the SPS) traffic pattern as well as the external (detached) traffic pattern for moving personnel and materials within the SPS and to and from the ground. 3. Man-Machine Accessibility to SPS Elements This item includes the ability of construction crews to have access to various SPS construction components during the buildup sequence. The access includes manned manipulator operations to SPS components and EVA/IVA for contingency situations such as equipment failure, maintenance and repair operations, and crew rescue. 4. Communications This area pertains to communications, such as voice, TV, TLM, and intercom between construction base elements, transportation systems, orbital communications satellites, and the ground. The degree of base centralization vs. decentralization is also included. 5. Logistics This item addresses the ease and/or capability to supply and maintain the construction base elements with construction materials, spare parts, and also to rotate large crews on a regular basis.
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