Fig. 4. Configuration of a microwave power transmission experiment with the modified NASA Space Operation Center and Power Module. arcjet thruster to operate continuously, which is not possible at present. This study suggests that the electrical power can be utilized for SPS experiments in parallel with the MPD arcjet experiment to reboost space station assuming it boosts up a SPS constructed in low Earth orbit to the geosynchronous orbit. The mission concept of experiments is shown in Fig. 6 where two units of the modular space station in formation flight are conducting various experiments including power transmission from orbit to orbit as well as from orbit to ground. Other experiments are sounding of the upper atmosphere relating to environmental problems and such technological experiments as interactions of high power system with space plasma and geomagnetic field. Study 5 This study is concerned with safety assurance for construction of a large space structure against collision with other orbiting objects when it is built in a low Earth orbit. The high power radio wave generated in the space station will be used for surveillance radar for this purpose as well as power transmission experiments. If the construction space expands as wide as one cubic kilometer at the orbit altitude of 300 km, the probability of collision is an order of unity for a year, according to a calculation (8). This is an indirect approach but important aspect of the SPS study.
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