6. Model-Based Trade Studies and Analyses 6.1. Case Studies A series of case studies was devised as a means of assessing the relative benefits and economic viability of the various SSP concepts and architectural configurations. As will be noted in the descriptions that follow, the included case studies and suggested architectures were designed to provide common bases for comparing the technical and economic performance of one concept against another under certain imposed requirements such as transmitted power, total delivered power, duty cycle, market size, and selected assumptions concerning space segment technology and operations. In the process, it was expected that such comparisons, and the quantitative data they would provide, would help identify those concepts and architectures that offered the greatest potential for future investment and development. 6.1.1. Case Descriptions Using the Space Segment and IAAM models, the following set of thirteen case studies were performed to evaluate the relative merits of the four primary SSP concepts addressed in the Phase II study. 1. Examine the performance of a single SolarDisc providing 5 GW delivered power to a single site, for comparison with the 1979 Reference System concept. Assume power transmission at a frequency of 5.8 GHz, using solid state FET devices producing 10 Watts RF power per chip at 80% efficiency. 2. For comparison with Case Study 1, report results provided by the 1979 Reference System design which used klystron devices operating at 2.45 GHz to deliver 5 GW to a single dedicated site. 3. Report performance of a fully developed Reference System architecture providing 300 GW total power to 60 sites at 2.45 GHz. 4. Compare the results of Case Study 3 to that of a constellation of SolarDiscs delivering a total of 300 GW power to a larger number of different sites made available through electronic beam steering. Transmitter assumptions (5.8 GHz, etc.) are the same as Case Study 1 for this and all remaining case studies. 5. Examine a build up of MEO SunTowers to as many as needed to provide 24 hour coverage to a single ground she. Total delivery capacity of the SunTower fleet should add up to 5 GW, which would make h equivalent to a single Reference System SPS. An example constellation would be 21 satellites, consisting of seven satellites in three different planes, each delivering 250 MW. A MEO orbit of 6000 km altitude is assumed. 6. Determine, on average, the number of ground sites needed to ensure 24-hour duty cycle for a single MEO SunTower in a 6000 km orbh and the power delivered by the satellite on a daily basis. Assume 250 MW power as in previous case. 7. Examine SolarDisc architectures optimized for the various market places (from Mega-Chy to Town) to determine which archhecture/market produces the best IRK Identify the best case for subsequent sensitivity analyses.
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