ABBREVIATIONS AC - Alternate Current AMO - Air-Mass-Zero AOCS - Attitude & Orbit Control System AU - Accounting Unit BOL - Begin-of-Life COTV - Cargo Orbital Transfer Vehicle CR - Concentration Ratio DC - Direct Current DDT&E - Design, Development, Test & Evaluation DOE - (U.S.) Department of Energy EC - European Communities EMI - Electromagnetic Interference EOL - End-of-Life ERDA - (U.S.) Energy Research & Development Administration FEEP - Field Emission Electric Propulsion GEO - Geosynchronous Earth Orbit GSSPS - Gravitational Stabilized SPS GW - Gigawatt HLLV - Heavy Lift Launch Vehicle LEO - Low Earth Orbit LH2/LOX - Liquid Hydrogen / Liquid Oxygen LPTS - Laser Power Transmission System MHD - Magneto-Hydro-Dynamic MOSES - Modular Solar Energy Satellite MPTS - Microwave Power Transmission System MW - Megawatt OECD - Organisation for Economic Co-operation & Development OLL - Orbital Longitude Limitation OTV - Orbital Transfer Vehicle PLV - Personnel & Priority Cargo Launch Vehicle POTV - Personnel & Priority Cargo OTV PRS - Power Relay Satellite R&D - Research & Development RF - Radio Frequency RFI - Radio Frequency Interference SPS - Solar Power Satellite / Satellite Power System / Satellite Power Station SSME - Space Shuttle Main Engine SSPS - Satellite Solar Power Station VTOHL - Vertical Take-of/Horizontal Landing
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