Satellite weights were then coupled with the number and schedules of satellites required to define a range of transportation requirements. These requirements were used to guide the study of various transportation elements and to estimate integrated transportation requirements such as fleet size. Transportation elements for which specific studies were conducted included multistage winged and ballistic heavy lift launch vehicles, a variety of orbital transfer vehicle thrusters, and personnel launch and transfer vehicle designs. In a similar manner, the satellite and transportation system characteristics, number, and schedule were used as a basis to estimate the cost of design, development, test, and evaluation (DDT&E), total program, and mills per kilowatt hour. Preliminary estimates are also provided of natural resource requirements and pollutants emitted from processing and launch operations. Estimates of energy payback are also presented. Figure 1-1 presents the task structure that was used in the study effort. The present report (Vol. I) and Volume II are also organized according to this task structure. Figure 1-1.- Study task structure.
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