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Radio Occultation Data Analysis at the COSMIC Data Analysis Archival Center CDAAC

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Radio Occultation Data Analysis at the COSMIC Data Analysis Archival Center CDAAC

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    1. Radio Occultation Data Analysis at the COSMIC Data Analysis & Archival Center (CDAAC)

    2. Overview COSMIC Description CDAAC data processing and data formats Successes Challenges CDAAC 'Live' demo

    3. COSMIC at a Glance

    4. COSMIC Launch

    5. COSMIC Occultation Distribution

    6. COSMIC System

    7. COSMIC Spacecraft Orbital Science’s ORBCOM s/c bus Mass ~ 70 kg, Size ~ 1m diameter Propulsion: orbit insertion, maintenance, de-orbiting Attitude: Control: 2deg pitch, 5deg roll/yaw (2-sigma) Knowledge: 1deg pitch, 2deg roll/yaw Nadir orientation, 3-axis stabilized 40 MB on-orbit storage

    8. COSMIC Payloads Each COSMIC satellite will carry 3 complementary payloads GPS - for atmospheric/ionospheric profiling and scintillation JPL Heritage design Tiny Ionospheric Photometer (TIP) for F2 layer electron density mapping NRL Heritage design Tri-band beacon (CERTO/TBB) for high-resolution ionospheric imaging and scintillation studies NRL Heritage design

    9. COSMIC GPS Receiver: ARGO

    10. COSMIC Data Analysis and Archival Center (CDAAC)

    11. CDAAC Responsibilities Process all COSMIC observations LEO/GPS orbit determination Atmospheric & Ionospheric profiles Rapid analysis for operational demonstration Post-processed analysis for climate and other research Provide data to universities and research laboratories Provide data feeds (< 3hr) to operational centers Archive data & provide web interface

    12. CDAAC Processing Flow

    13. GPS Data Processing

    14. LEO POD Quality

    15. Calibration of excess phase delay

    16. Inversion Details

    17. CDAAC Hardware

    18. CDAAC Software Software written in perl, C or FORTRAN Currently consists of around 100 separate packages: CVS modules for source developed at UCAR open source packages: apache postgres perl perl modules Commercial packages Bernese F90 compiler Includes install system for easy compilation and testing on a basic Linux system

    19. CDAAC post processing

    20. CDAAC real-time processing

    21. Realtime processing (cont.)

    22. Question: How to deliver data

    23. File Formats

    24. BUFR format

    25. BUFR format issues

    26. Successes

    27. Validation Statistics with NCEP

    28. ROSE Refractivity Comparisons

    29. Tailored experiments with predicted occultations

    30. COSMIC Challenges

    31. Inversion Q/C: CHAMP 2002.213-243

    32. Clock distribution problems

    33. L2 signal noise, SAC-C

    34. Extrapolation of Ionospheric Correction to process occultations with noisy L2

    35. Super-refraction, Ducting

    36. Summary COSMIC program on track for 2005 launch: satellites are built at Orbital, GPS at Broad Reach, TIB + Beacon at NRL CHAMP and SAC-C processing up-to-date Near-real time processing, ~1 day latency for CHAMP data ~ 70-80% of calibrated occultations are inverted successfully (2002.213-243) Good agreement between CHAMP and SAC-C Good agreement with NCEP/ECMWF Comparisons between GFZ/JPL/UCAR successful Ongoing work on data delivery to weather centers (formats, protocols) Web page: www.comic.ucar.edu

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