and geosynchronous Earth orbit construction will differ to respond to the differing needs of a program performing the construction. Low Earth orbit construction offers the potential for employment of the payload to produce electrical power, as differentiated from the more severe transportation requirements posed by deferring assembly of the power satellite modules until they are transported to geosynchronous orbit. In this latter case, an independent power source such as a nuclear reactor or solar collector must be supplied for any electric propulsion type OTV, or a conventional chemical propulsion system used. Alternative types of OTV's corresponding to LEO and to GEO assembly choices, will have to be analyzed and defined for comparative evaluation until the assembly location choice and payload power availability for orbital transfer determination is made.
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