necessary to compromise these two conflicting factors for orbit selection in addition to considering the debris condition. Considering that the SPS 2000 system will be constructed modularly, the first few flight units will necessarily be used to test and verify the technologies of the system and operational functions. One of the rectennas will be designed as an experimental rectenna station, where the characteristics of the power transmission system are measured and newly developed equipment and facilities will be tested. Some scientific observation facility such as a radar for high altitude atmospheric research will be useful for observation of the phenomena caused by the interaction of the microwave beam and the ionosphere below 1000 km. The ground system can be used for small local electric power stations, which are now powered by small hydraulic generators, photovoltaic generators or diesel generators. In this case, the power system need not compete with a large electric system
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