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COSMIC-II (C2)

COSMIC-II (C2). Rick Anthes 2 nd GPS RO Users Workshop 22-24 August 2005 Lansdowne, VA. 2006-2011. 2011 and beyond. Summary. Proof of concept of the potential value of GPS RO observations has been demonstrated (weather, climate, space weather)

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COSMIC-II (C2)

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  1. COSMIC-II (C2) Rick Anthes 2nd GPS RO Users Workshop 22-24 August 2005 Lansdowne, VA 2006-2011 2011 and beyond

  2. Summary • Proof of concept of the potential value of GPS RO observations has been demonstrated (weather, climate, space weather) • Operational GPS RO observations called for by WMO studies • Augment present and planned satellite remote sensing at a reasonable cost • Transition COSMIC constellation into full operations beginning in ~2010 or 2011 • Plan for success!

  3. GPS Radio Occultation (RO) Deduce atmospheric refractivity based on precise measurement of phase delay and amplitude. GPS Satellite LEO Orbit Atmosphere Radio Signal LEO Satellite

  4. Signals Abundant GPS Glonass Galileo 60–90 Sources in space T. Yunck, JPL

  5. GPS RO-Research to Ops • GPS radio occultation is a very promising atmospheric observing system for both weather and climate: • Temperature, water vapor, electron density information • High vertical resolution • High accuracy (<1K) • Unaffected by clouds • Self calibrating, no instrument drift or satellite-to-satellite bias (important for climate detection) • GPS RO data will be valuable to: • Operational weather prediction • climate monitoring and analysis, validating of climate simulations • ionospheric research and space weather forecasting • Calibrate/complement/enhance other satellite observing systems ) • Need plan for transition from research into operations

  6. Group on Earth bservations Earth Observation Summit I Washington, DC, July 31, 2003 • Summit represented a high level governmental/political commitment to move toward a comprehensive, coordinated, global network: • Issued declaration to support this concept • Launched development of 10-year implementation plan • Established the Group on Earth Observations with US Co-Chair 34 Nations 20 International Organizations

  7. GCOS Implementation Plan for the Global Observing System for ClimateOctober 2004 Action A20 (AF13): GPS RO measurements should be made available in real time, incorporated into operational data streams, and sustained over the long-term. Protocols need to be developed for exchange and distribution of data. GCOS-92, WMO/TD No. 1219, October 2004

  8. GOS Implementation Plan Draft Rec S12: The opportunities for a constellation of RO sounders should be explored and operational implementation planned. There has been good progress in planning for NRT distribution of METOP/ GRAS and COSMIC data. Action: WMO Space Programme to discuss with space agencies (1) proposal to develop a shared ground network system and (2) operational constellations following COSMIC. WMO/CBS/OPAG IOS ET-ODRRGOS Final Report, 6-10 Sept. 2004, Annex VI

  9. GPS Radio Occultation Missions

  10. Combined Soundings at CIMSS • RMS and bias of temperature profile retrievals from ATOVS alone (blue) and ATOVS plus CHAMP (red) with respect to radiosonde measurements in clear and cloudy conditions for the months of October 2001, January 2002, April 2002, and July 2002. • (Borbas et al, CIMSS)

  11. Information content from1D-Var studiesIASI (Infrared Atmospheric Sounding Interferometer)RO (Radio Occultation) (Collard+Healy, QJRMS,2003)

  12. COSMIC II • ~2500-10,000 high-quality, independent soundings to complement and improve infrared and microwave soundings • NPOESS Risk reduction • Affordable (<$15M/year average annual ongoing costs) • Major new contribution to GEOSS [Higher number of soundings in ( ) if Galileo included]

  13. COSMIC II Studies • UCAR started COSMIC II study work with white paper and presentations to NOAA and NSF • Desire to launch a C2 no later than 2011 - no gap in GPS RO • Intended for C2 to be fully operational mission • C2 Proposed Architecture • 6-12 Microsats • Lighter and less expensive - focus on the RO mission • Able to launch on Minotaur, Peacekeeper, Falcon to keep launch costs low • Updated GPS RO Receiver based on Blackjack • No commercial parts for longer mission life • Improved performance • UCAR working with NOAA to refine concept. • Are exploring interests of international partners

  14. Concept for Constellation C2 baseline concept spacecraft in flight Total Mass Estimate: 24 Kg. Total Orbit Average Power: 29 watts Stowed Size: 50 cm x 40 cm x 10 cm Improved occultation receiver Reduced latency (<25 min) GPS and Galileo tracking

  15. Summary • Transition research into operations-maintain a constellation of small satellites in low Earth orbit producing RO observations to help meet the weather, climate and space weather operational requirements as part of the GEOSS.

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