CDAAC GNSS Radio Occultation Datasets

CDAAC processes and makes available data from more than a dozen GNSS radio occultation missions.

Detailed information about the COSMIC-1 and COSMIC-2 mission is on separate pages.

For missions other than COSMIC-1 and COSMIC-2 the table below lists processing mode, available date range, link to the data, and file types published.

CDAAC Data Users Forum where you can post your question and interact with other data users is found here.

File Formats

Further information on each file type:

• Level 1a

  • Spacecraft attitude information (leoAtt format)

  • Precise orbit determination antenna tracking data (podCrx/RINEX2 format)

  • Radio occultation antenna tracking data (opnGps format)

• Level 1b

  • Atmospheric excess phase (atmPhs format or conPhs format)

  • Navigation bits used for processing open loop data in the lower troposphere (gpsBit format)

  • Ionospheric excess phase (ionPhs format)

  • Clock offset values for each LEO satellite (leoClk format)

  • LEO orbit specification file (leoOrb format)

  • Absolute Total Electron Content and auxiliary data (podTec format)

  • S4 scintillation index and auxiliary data (scnLv1 format)

• Level 2

  • Atmospheric profiles without moisture (atmPrf format)

  • Low-resolution, atmospheric profile in the BUFR format (bfrPrf format)

  • ERA-40 Interim reanalysis data (eraPrf format)

  • NCEP operational analysis data (gfsPrf format)

  • Ionospheric profiles (ionPrf format)

  • Atmospheric profiles with moisture (wetPrf format)

Supporting Documentation

Standard RO Inversions in the Neutral Atmosphere 2013 - 2020 (Processing Steps and Explanation of Data) (144.0 KB)