Exo Mars 2020 Mission Sharing TGO passes between
Exo. Mars 2020 Mission Sharing TGO passes between Rover and Surface Platform 18 April 2018, issue 0. 0 ESA UNCLASSIFIED - For Official Use
Overflights ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 2
Overflights with ground station visibility ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 3
Overflights with idealized ground station bookings ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 4
Forward Link Latency : mean of 4. 1 hours (+/- 1 hour) 1 – 10 min 2 hours 1 sec GFTS OPS-LAN MPLS ROCC 30 sec – 1 hour Transmit Failure Report Transmit Re-Transmit TGO MOC ERCO 50 – 75 min Ground Station (Tx duration x 2 + OWLT x 3) TGO Rover Return Link Latency : mean of 1. 6 hours (+/- 1. 2 hours) 20 min – 1 hr 53 min 5 min MPLS Transmit Rover 1 sec TGO ESA UNCLASSIFIED - For Official Use No repeat on failure Ground Station TGO MOC 1 min 1 – 10 min OPS-LAN GFTS ERCO ROCC ESA| 18/4/2018 | Slide 5
Idealised Earth-Mars Communication ROCC/SPOCC daily activity Variable Occultation Ground Upload latency From 0 to ~1 hours LCC ROCC/SPOCC daily activity Strategic planning E R C O TGO MOC E R C O Ground Upload Occultation latency From 0 to ~1 hours LCC E R C O Rover/SP Activity Execution Forward link latency Rover/SP Comm About 10 minutes LCC Ground Network visibility Rover Post Comms Activities Rover Night Rover Wake-up & Pre-comms Activities Forward link latency Earth-TGO Downlink Duration TGO TC TM Return link latency E R C O GS Earth-TGO Downlink Earth-TGO Uplink duration Duration TGO Rover-TGO comm window TGO MOC GS Ground Network visibility Earth-TGO Uplink duration From 0 to ~1 hours TGO MOC GS GS Variable Ground Download Occultation latency Variable Ground Download latency ROCC/SPOCC daily activity Strategic planning Rover-TGO comm window Rover/SP Comm About 10 minutes Rover/SP Activity Execution Return link latency Comms windows used by Rover or Surface Platform ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 6
Rover RSM Relay Planning SP RSM Apr 21 P L T E OSP Orbit Files Improved orbital accuracy Q 3/2020 Proposed overflight allocation Optimum Ground Station Plan OOF Initial Relay Planning Agreed Oct 21 Relay Operations Jan 21 Monthly consolidated relay planning OOF overflight allocation Updated overflight times + Updated latencies + Updated overflight allocation + (split overflights can still be adjusted) Mar 21 Weekly final relay planning ESA GS negotiation Q 2/2020 (see next slide) TGO GS Bookings ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 7
Final Relay Planning Details Mar 21 Weekly final relay planning ELECTRA ACTIVITY AT MARS (relaying products provided each day using the pre-planned overflights) TGO MOC ACTIVITY (Electra programming including communication to TGO) ERCO/ROCC/SPOCC coordination (including split overflights) + (biweekly) NASA coordination ESA UNCLASSIFIED - For Official Use S S E R C O N A S S S S M T W T F Short Weekly Term Planning Uplink E R C O ESA| 18/4/2018 | Slide 8
Dealing with Contingencies Ground Segment Contingency - Make use of redundancy - If station antenna fails, probably too late to find alternative - Current forward link abandoned - New products created and sent via subsequent orbiter overflight ! ESA UNCLASSIFIED - For Official Use ! Orbiter Contingency - Current forward link abandoned - New products created and sent via subsequent orbiter overflight Rover Contingency Additional orbiter overflights could be prescheduled in case of need ! ESA| 18/4/2018 | Slide 9
Background Slide – Acronyms BLK Bear Lakes & Kaliazin CEB Cebreros ERCO European Relay Coordination Office LCC Lander Control Centre MLG Malargue MOC Mission Operations Centre NNO New Norcia OWLT One Way Light Time ROCC Rover Operations Control Centre RSM Reference Surface Mission SP Surface Platform SPOCC Surface Platform Operations Control Centre TGO Trace Gas Orbiter ESA UNCLASSIFIED - For Official Use ESA| 18/4/2018 | Slide 10
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