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Data Communications Supporting Astronomy/Astrophysics at South Pole Station

Data Communications Supporting Astronomy/Astrophysics at South Pole Station. Erick Chiang, NSF-OPP NASA-NSF Astronomy/Astrophysics Advisory Committee May 11, 2006 Arlington, VA. GOES-3. TDRS F1. Equator. MARISAT-2. Current Service. Contiguous Coverage: 11.5 hrs/day

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Data Communications Supporting Astronomy/Astrophysics at South Pole Station

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  1. Data CommunicationsSupporting Astronomy/Astrophysics at South Pole Station Erick Chiang, NSF-OPP NASA-NSF Astronomy/Astrophysics Advisory Committee May 11, 2006 Arlington, VA

  2. GOES-3 TDRS F1 Equator MARISAT-2 Current Service Contiguous Coverage: 11.5 hrs/day Max. Bulk File Xfer: ~ 10 GB/day Bulk File Xfer: TDRS F1 only TCP/IP networks: all satellites

  3. Upgrade #2: TDRS @ 150 Mb/s Upgrade #1: TDRS @ 45 Mb/s GBytes/Day Baseline: TDRS @ 5 Mb/s Demand & Capacity Forecast

  4. Space Segment Planning Issues • TDRS F1 • Provides best value – flat fee (~$650K/yr) for NSF dedicated use of complete daily viewing window • End of life likely during 2007-2008 forces a switch to TDRS F3 • TDRS F3 • NSF as a fully scheduled user, subject to NASA priorities and $130/min fee • User fees disincentive for NSF to maximize IP network service – service model restricts air-time to ~ 90 min/day to move bulk data @ 150 Mb/s • Other Satellites • MARISAT-2 end of life estimated for August, 2010 • GOES-3 service variable and at-risk due to satellite age • Impacts • Broadband IP network daily connectivity and quality will decline significantly • Recurring operations cost will rise sharply • Non-NASA options under study, but results are not encouraging

  5. Action Upgrade existing SPole & White Sands earth stations @ $1.5M Expand Iridium Multiplex service @ $300K MARISAT-2 as TDRS contingency Construct New SPole earth station @ $6.5M Continue search for satellites Result 2007: 45 Mb/s TDRS F1 link @ 75 GB/day (max) 2007: 24 kb/s thin IP network gapfiller link 2007: 4 Mb/s back-up link 2009: 150 Mb/s TDRS F3 link @ 250 GB/day (max) Additional First Generation operational TDRS in view in 2006, 2007, 2008, & 2009 Other future options remain elusive NSF Long Range Plan

  6. First Generation fleet (F1-F7) will age and incrementally fail NSF will face increased competition for dwindling first generation fleet NASA VSE roadmaps for space communications/navigation nearing/at completion Roadmaps stated need for 2 additional Second Generation (F8-F10) satellites by 2015 to meet demand Second Generation satellite orbits never visible from Pole Nascent NASA initiative for a TDRSS follow-on design yet to attract support NASA Space Communications Program under review by National Academy, with report due in early 2007 NASA Long Range Planning NSF needs NASA to engage as a strategic planning partner

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