less than that of the Microwave Solution described in PART I would seem a reasonable target to aim for, i.e. 500-2.000 meters. • For lasers, aperture size is less of a constraint because of the much higher frequencies that can be used. This allows greater distances to be attempted, limited by the pointing precision and the aperture of the optics (see below). For the proposed Laser Solution discussed in PART I. demonstrations of up to the full distance of 12,000 km should be considered. More realistically, distances on the order of 10 kilometres would be reasonable. Pointing Precision For microwave or lasers the pointing precision is a function of the transmission and the rectenna size. As an approximate guide, the precision should be such that the beam never wanders more than onetenth the diameter of the beam beyond the centre of the beam. Such precision will be essential for a future operational Powersat, as it enables the rectenna size to be constrained and minimises spillover that could lead to safety and telecommunications interference (microwave) concerns. Experiment Time Period This is important to understand because the longer the experiment, the more capable and. as a result, expensive the demonstrator will need to be. At the minimum, the experiment should be conducted over several days with power beaming sustained for periods on the order of one hour. (Factors determining the time period will be highlighted in Sections 5 & 6.)
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