ROI Return on Investment ROM Reduced Order Models RPM Revolutions Per Minute RTG Radioisotope Thermal Generator RW Reaction Wheel SA Solar Array SAA South Atlantic Anomaly SAR Synthetic Aperture Radar SDS Solar Dynamic System SERI Solar Energy Research Institute SFU Space Flyer Unit SGD Space to Ground Demonstration 1 S/L Satellite SME Society of Mechanical Engineers SOLSTICE Solar/Stellar Irradiance Comparison SPAS Shuttle Pallet Satellite SPDE Space Power Demonstrator engine SPELDA Structure Porteuse Exteme Lancement Double Ariane SPS Solar Power Satellite SQ Space Qualified SRB Solid Rocket Booster SRM Solid Rocket Motor SSA Space Suit Assembly SSF Space Station Freedom SSLV Standard Small Launch Vehicle SSME Space Shuttle Main Engine SSO Sun Synchronous Orbit SSPP Space Solar Power Program SSTO Single Stage to Orbit STAR Commercial solid upper stage engine STPL Short Term Public Limit STS Space Transportation System SU Space Unqualified SUSIM Solar Ultraviolet Spectral Irradiance Monitor TBC To Be Confirmed TBD To Be Defined TCS Thermal Control System TDRSS Tracking and Data Relay Satellite Systems TELEC Thermoelectric laser energy converter TFU Theoretical First Unit cost TOS Commercial upper stage TPS Thermal Protection System TPV Thermophotovoltaic TSTO Two Stage to Orbit TT&C Telemetry, Telecommand and Control System TTL Transistor Transistor Logic TV Television UARS Upper Atmosphere Research Satellite UN United Nations US United States USA United States of America USAF United States Air Force USS Ultra Short Spelda USSR Union of Soviet Socialist Republics VEB Vehicle Equipment Bay VOC Value of combination VSWR Voltage Standing Wave Ratio WDE Wheel Drive Electronics WINDII Wind Imaging Interferometer WSF Wake Shield Field XLR-132 Experimental Liquid Rocket -132
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