11.5.5 Support Subsystems Frame structures for free-flying and Shuttle fixed pallets have been investigated in Germany. Experiences of this work is directly applicable for SPS structure development. Rotary joints between solar arrays and the central body are used in 3-axis-stabilised spacecrafts. But it seems obvious that a joint of SPS-dimensions requires new technologies. Technological studies on thermal control have been performed including radiators, high density cold plates and high efficiency heat transport systems. This work is directly applicable to SPS. II.5.6 Construction and Maintenance Spacelab and planned follow-on activities are the basis for further study on space construction and habitation. Advanced Spacelab modules and pallets could be essential for the erection and operation of the very large assembly/construction facilities. II.5.7 Personnel and Priority Cargo Launch Vehicle (PLV) and Orbital Transfer Vehicle (OTV) Modified Spacelab Modules are applicable in principle for crew transportation with the Shuttle system. Experiences from Ariane propulsion systems are useful for design of the personnel transfer vehicles employing chemical propulsion stages. The electrical propelled COTV (Cargo Orbital Transfer Vehicle) might employ thruster systems like the AOCS, whose concerning hardware efforts in Europe are described in II. 5.4. II.5.8 Ground Receiving Station Rectenna elements including half-wave dipoles, wave filters, rectifier circuits and collecting busses are existing. The outstanding requirements of the rectenna are higher efficiencies (as those of today) and that it can be continuously fabricated at high speed, possibly at an on-site manufacturing complex.
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