Figure 14-16. OTF Power Densities Potential problems with the OTF in low orbit are the high rates relative to the earth and the short acquisition and viewing periods for a rectenna power transfer demonstration. The high rates become a problem for the attitude control design for the satellite and also for design of the electronic phase control system. These difficulties will exceed those in a geosynchronous MPTS and should be considered in evaluating the merits of power beam control and transfer demonstrations in low earth orbit. 14. 3 COST AND SCHEDULE The ground rules established for arriving at rough order of magnitude (ROM) costs were to (1) use previously established levels of cost per kilogram for the development phase, (2) to use a learning curve factor of 85 percent to work backward from the MPTS estimates for subsystems made previously, and
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