switching of the microwave beams from one rectenna to some other or to the satellite, etc. And it is necessary to guarantee permanent tracking and focusing on the microwave beams from the Moon to the corresponding rectennas or satellite repeaters and from the latter to other rectennas. The specialists consider it practically feasible though a very' sophisticated control system would have to be created for this purpose. Creation of LPS will apparently be performed in stages with gradual increase in capacity and number of its components. At first the lunar bases and rectennas without satellites around the Earth and Moon will be constructed. In this case interruptions in lighting the rectennas by the microwave beams (interruptions in power supply from them) will be long (from several hours to several days). At these stages LPS will only save fuel with complete duplication of its capacity. Interruptions in lighting the rectennas will be irregular (as distinct from the considered solar power satellites on the geostationary orbit). As the capacity of LPS will grow, the plants for synthetic fuel production that can be used for energy supply during rectenna disconnection and leveling its output will be constructed near the rectennas. Each base on the Moon can supply several rectennas with energy. Therefore, the bases can be constructed in phases with the increase in the area of solar collectors and construction of few antennas and with the coordination of construction of rectennas on the Earth. The problem of choosing the sites and capacity of the rectennas is very important. In its solution, account should be taken of the following factors: 1. conditions of energy supply from other sources in different parts of WES including the possibilities for constructing terrestrial solar power plants; for example, there are no such possibilities in the countries of South-East Asia that are cloudy for months in the rainy season; 2. areas of possible siting of rectennas in terms of the Moon visibility (in the polar zones the Moon passes too low above the horizon); 3. kinematics of the interaction between the lunar bases and their antennas and the rectenna system on the Earth and the satellites around the Earth and Moon (including the solar power satellites if they are created in parallel with LPS) at the later stages of LPS creation. At the large number and capacity of the rectennas the structure and modes of WES and LPS operation become highly interconnected. For example, the rectennas lighted in turn from one and the same antenna but located in different parts of WES (on different sides of the Earth) should have approximately (or even strictly) the same capacity. When choosing the sites and capacity of the rectennas at the earlier stages of WES creation consideration should be given to the possibilities of subsequent launching of the satellite repeaters from the view point of availability of a sufficient number of
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