1.2.3.6 Efficiency The reported range of expected DC-DC efficiency for microwave power transmission is 57-68 %. I.2.3.7 Problems The reported main problems with microwave power transmission are: - Reliability and lifetime of microwave amplifiers (up to 30 years) - Beam steering and control, phase-control - Acceptable thermal deflection of transmitting antenna structure I.2.3.8 Laser Power Transmission System ( LPTS ) Recent approaches show, that although the microwave power transmission system MPTS) is much more advanced in understanding than a laser system, the laser transmission has quite a potential for application in a SPS. Advantages are: - Considerably reduced land requirements for receiving sites, - Absence of radio-frequency-interferences (RFI), - Not dependent on 5 GW - size Disadvantages are: - Very low demonstrated receiving and conversion efficiencies, - Extremely high power densities in the beam. - Transmission dependent on weather conditions 1.2.4 Structure and AOCS (Attitude and Orbit Control System) (References: 76/2,78/3,78/23,78/29,78/34,78/35,78/55.) I.2.4.1 General This category implies the support functions of the structure, the investigation of mechanical and thermal loads to the structure, materials for the structure, and considerations of an attitude and orbit control system.
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