The relay satellites will circle in geostationary orbit at a distance of 36,000 km round the Earth every 24 hours. It is necessary to control the laser transmitting system accurately to track the relay satellites which are reciprocating always at an angle of 0.14 radian. Therefore, a highly reliable and highly accurate control system will be required. Relay Satellites The relay satellites in geostationary orbit serve as large-scale energyconversion stations. The relay satellites receive the ultraviolet laser beam from the Moon, convert the wave length, and transmit it to Earth as infrared laser. In SPS[3] proposed by P.E. Glaser, microwave is proposed for transmission of electricity from the satellites to Earth. Recent research results, [4] however, revealed a possibility that some nonlinear interaction of intense microwave and the ionosphere plasma may be caused by the microwave power transmission, and thus the transmission of large amount of energy by microwave may pose great risk to the global environment. Therefore, we would like to adopt a system in which energy is transmitted by infrared laser, which is thought to give less influence to the environment of the Earth and has a high efficiency in power transmission. By taking into account the effective utilization of geostationary orbit, multiple numbers of satellites can be arranged to supply energy to the Earth. The size of receiving antenna on a relay satellites depends on the wave length of the laser beam adopted and tracking accuracy of the laser transmitting system at the LEP. The antennas of a relay satellite and of the laser transmitting system on the Moon have to be always tracked to align. Power-Receiving Stations on the Earth Infrared laser light from the relay satellites in geostationary orbit is received at stations on isolated islands. Since the distance and orientation between the relay satellites and the receiving stations is almost unchanged, it is possible to construct large- capacity light-collecting equipment on the Earth. By connecting the equipment to existing power distributing systems, energy can be distributed all over the world. Construction of the Lunar Energy Park The LEP will be constructed by human beings, and, after start-up, will be maintenance-free. The environment on the Moon is different from that of the Earth, because powerful cosmic rays fall on the Moon. During construction of the LEP, the residential areas will be required in the location near to its construction site. After completion of the LEP, however, human beings will not be permanently stationed on the Moon when LEP is in steady operation. At the time of steady operation, the LEP will be operated automatically, including inspection of functions and repairs, using primarily intelligent robots. Routine construction work will be also undertaken mainly by robots. Construction of plants on the Moon will require large quantities of equipment and materials. It is appropriate that precision equipment will be provided from Earth, and building materials will be procured on the Moon. Fe-Si resources suitable for
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