Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

Appendix L: Tether Boost Facility Design Final Report4 CONTROL STATION PHASE II DESIGN SUMMARYSection 4.2 summarizes the current design features of the first launch of apartial capability Control Station. The Control Station (along with grapple and tether)is within mass budgets for launch on a Delta-IV Heavy Launch Vehicle. Primaryfeatures of the system are use of PV concentrator solar arrays, Lithium-Ion batteries,CMGs for attitude maneuver and control, GPS/INS for guidance and navigation input,and a tether subsystem that will support a 100 Km, 300 kW electrodynamic tether.4.1 First Facility Launched• Control Station mass = 13,267 kg (includes 21% mass margin)• Operational mass = 23,358 kg, no margin CS w/PAF• GLOW = 19,891 kg with 15% margin, no PAF4.2 FeaturesEPS• Scarlet-like concentrator PV arrays, 563 square meters• Standard, state-of-the-art PV array drive motors• State-of-the-art power management and distribution except forelectrodynamic tether subsystem• Lithium-ion battery power storage system• 5,410 kg (includes 14%mass growth margin)Communication Subsystem• Downlink communication with ground station(s) andcommunication with Grapple Assembly and PAA (via TetherFacility Network)• State-of-the-art, COTS hardware (antennae/transceivers)• Dual redundancy• 4.2 kg (includes 16% mass growth margin)C&DH• State-of-the-art, COTS hardware• Dual redundancy• 29 kg (includes 13% mass margin)ADCS/GN&C• 2 Control Moment Gyros (noredundancy), each assumed half size ofa Skylab CMG• 2 sun sensors• 2 inertial navigation unit• GPS antennae (3)/tranceivers (2)• 213.8 kg (includes 6% mass margin)Electrodynamic Tether Subsystem• Sized for 80 km conductive tether, totallength 100 km, 300,000 W, 40 µN/Wthrust efficiency• Control Subsystem with 1m diameter,1.5m long reel, motor, tether guides,power conversion, FEACs• 1,933 kg (includes 36% mass margin)L-75