Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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Rendezvous Method: Preparation• Propagate tether orbit to obtain future tip position &velocity• Propagate a “virtual payload” backwards in time• Real payload performs standard, slow rendezvouswith “virtual payload”• During approach, payload performs corrections toaccount for propagator errorsTUI/MMOSTT 26
Rendezvous: Payload Acquisition• Rapid Automatic Rendezvous & Capture(AR&C) is a Key Requirement– Payload is in free-fall orbit– Tether tip under 1-2 gees centrifugalacceleration– Relative speed zero only momentarily– 1 s @ 1 gee => 5 m & 10 m/s• TUI Has Developed Methods for ExtendingRendezvous Window– Grapple Assembly has small tether deployer– At conjunction of payload and tether tip,grapple assembly deploys tether at lowtension• 1 km tether gives 10s @ 2 gees– Grapple and payload “float” in free falltogether for 5-10 seconds– Payload maneuvers to dock with grapple– Grapple applies brake to tether gradually tominimize tether tension excursionPayload Capture Vehicledescends towards PayloadSeparation (m)Load Level10.80.60.40.21050∆X∆Z-5-5 0PCV DeploysMore TetherPayload Capture VehicleReleases Tethered Grapple12-Second AR&C WindowPCV pays out tetherand Payload maneuversto dock with grappleGrapple AcquiresPayload and PCVHalts Tether DeploymentPCV engagestether brake andbegins to lift payload5 10 15 20Time (s)TipMiddleFacility00 400 8001200 1600 2000Time (s)TUI/MMOSTT 27
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Tethers Unlimited, Inc.MMOSTT Final
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NIAC Funded Tether Research• Moon
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Electrodynamic Reboost• Power sup
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Cislunar Tether Transport System•
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MXER Tethers Included in NASA’sII
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5mt Payload Tether Boost Facilityfo
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LEOGTO Boost Facility• Initial Fa
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Tether Boost FacilityControl Statio
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LEOGTO Boost Facility• TetherSim
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Rendezvous• Rapid AR&C Capability
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Proposed RETRIEVE TetherExperiment
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µTORQUE on Delta IV• Delta-IV Se
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Opportunities for NASATechnology De
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AIAA 2000-3842COMMERCIAL DEVELOPMEN
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--Commercial Tether Transport AIAA
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-Commercial Tether Transport AIAA 2
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Commercial Tether Transport AIAA 20
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Commercial Tether Transport AIAA 20
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Momentum Exchange/Electrodynamic Re
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DESIGN AND SIMULATION OF A TETHER B
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Tether Boost Facility Design AIAA 2
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Tethers Unlimited, Inc.Cislunar Tet
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Interim Report Outline- Configurati
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Mission Definition¥ Payload Capaci
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Baseline Control Station DetailsTET
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Baseline Grapple AssemblyCAPTURES A
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LEO Facility System ArchitectureGRA
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Payload Adapter Assembly Subsystems
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Potential Reeling FunctionsReeling
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LEO Control Station Weights16
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Payload Adapter Assembly Weights18
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Tether Boost FacilityRequired Power
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Electrical Propulsion Voltage´ Spe
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Potential Reeling FunctionsReeling
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Preliminary Reeling AnalysisθθAss
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Tether Boost FacilitySystem Require
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Table of Contents1 Scope ..........
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2 ReferencesThis section lists docu
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The system shall measure and contro
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4 Ground Rules & AssumptionsThis se
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Appendix F: Tether Boost Facility D
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Appendix F Tether Boost Facility De
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Appendix F Tether Boost Facility De
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Appendix L: Tether Boost Facility D
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Page 180 and 181: Appendix L: Tether Boost Facility D
Page 194 and 195: Tethers Unlimited, Inc.Tether Rende
Page 206 and 207: Ongoing Tether Work Under NIAC Fund
Page 208 and 209: Cislunar Tether Transport System•
Page 210 and 211: Rapid Earth-Mars Transport• Reusa
Page 212 and 213: EarthMars Launch Windows• MMOSTT
Page 214 and 215: Incremental Development Path1. TORQ
Page 216 and 217: LEOGTO Boost Facility• TetherSim
Page 218 and 219: Tether Boost FacilityControl Statio
Page 220 and 221: Modular Design• Design Components
Page 222 and 223: Payload Accommodation AssemblyConfi
Page 224 and 225: Electrodynamic Thrusting• Drive c
Page 226 and 227: Tether Facility Reboost• Use Elec
Page 228 and 229: Rendezvous• Rapid Automated Rende
Page 232 and 233: Development Issues• Automated Ren
Page 234 and 235: Potential Flight Experiments• Hig
Page 236 and 237: Opportunities for NASATechnology De
Page 238 and 239: Acknowledgements• Boeing/RSS - Jo
Page 240 and 241: IAF-99-A.5.10RAPID INTERPLANETARY T
Page 242 and 243: Rapid Interplanetary Tether Transpo
Page 272 and 273: IAF-00-S.6.04TETHER SYSTEMS FOR SAT
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Page 278 and 279: IAF-00-S.6.04The LEO⇒GTO Tether B
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IAF-00-S.6.04AcknowledgmentsThis re
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Tethers Unlimited, Inc.Appendix K:
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Tethers Unlimited, Inc.at a rate of
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Tethers Unlimited, Inc.Appendix L -
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Tethers Unlimited, Inc.Appendixm M:
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Appendix N. MXER Tether for Deployi
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Electrodynamic Thrustingto Reboost
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100000 95000 90000 85000 80000 7500
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Momentum Exchange/Electrodynamic Re
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NOMENCLATURESymbol MeaningA payload
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DepartureangleA = 1.5π - (ω + u
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Tether material has a "characterist
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Rendezvous of Grapple with PayloadT
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adius vector to the new center of m
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days from payload pickup at one pla
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"JupiterandBeyond"Tether cut CUT:<
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Tethers Unlimited, Inc.Appendix Q:
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Tethers Unlimited, Inc.Appendix R:
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Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

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