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The Deep Impact Network Experiments - Concept, Motivation and Results

The Deep Impact Network Experiments - Concept, Motivation and Results
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  The Deep Impact Network Experiments  – Concept, Motivation and Results Joshua B. Schoolcraft , Scott C. Burleigh, Ross M. Jones, E. Jay Wyatt, J. Leigh Torgerson  Jet Propulsion Laboratory, California Institute of Technology  Copyright 2010 California Institute of Technology.Government Sponsorship Acknowledged.  DTN Operations in Space EarthMars antennacomplex Internet TCP/IP over wireless LAN rover Mars relayorbiter 1Mars relayorbiter 2 LTP over deep space link(AOS or TM/TC)LTP over expeditedProximity-1BP over multiple links lander Moon TCP/IP over wirelessLAN roverlander Lunar relayorbiter SCPS-TP overdeep spacelink (AOS orTM/TC) workstation SCPS-TP overexpedited Proximity-1  The Deep Impact Network(DINET I) Experiment • First deep space node on the Interplanetary Internet:  – Loaded DTN software onto the EPOXI spacecraft, 49-81 light seconds away, and operated it as a router in space for 4 weeks in Oct.-Nov. of 2008.  – Eight low-data-rate contacts with DSN stations.  – Moved 292 images (about 14.5 MB) through the network.  – DTN prioritization assured that all high-priority images were successfully delivered by DINET.  – No data loss or corruption anywhere in the network. • Used all new software on the spacecraft, but minimized risk in the ground data system.  – Ground segment of the network extended only within JPL; no connectivity to external sites, no seamless interoperation with remote users.  – For sustained operations to provide maximum value, the network must be extended securely to flight teams, instrument teams, and mission scientists.  DINET II • Objectives  – Develop and validate additional DTN functionality: • Extended priority system • Contact graph routing management • Network asset management • Extended network operations, including JHU-APL, CU and the ISS • Unacknowledged CFDP overlay • Bundle security protocol  – bundle authentication block  – Develop and validate key elements supporting the operational use of DTN on EPOXI for future space flight operations. • Flight operations srcinally planned for November 2009 but postponed util after EPOXI’s eouter ith oet Hartle  i Noeer . • Meahile, perfored dr ru eerise i Marh  iolig all elements except EPOXI spacecraft itself  – used testbed simulator instead. • Integrating DTN nodes beyond the JPL firewall into the DINET 2 topology was a key challenge.  The Deep Impact Network(DINET) Experiments Sol-localEarthOrbiterRelayMars Phobos DI spacecraft acts as relay orbiter(surface asset)(surface asset) ISSOrbiterRelayMOCEarth (Sol-observing spacecraft)Earth-local DTN assets DINET IIDINET I
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