Data from GLONASS-only GNSS receivers are available from June 11, 2002 (day 2002162) through July 09, 2005 (day 2005190). The GLONASS data are available through https and other methods at two URLs. GLONASS data obtained through the IGEX-98 campaign (August 1998) through June 11, 2002 are available online.
Access the GLONASS data by using one of the following methods:
- via https at URLs:
- https://cddis.nasa.gov/archive/glonass/data/daily/ (for GLONASS-only receiver data)
- https://cddis.nasa.gov/archive/gnss/data/daily/ (for GPS+GLONASS receiver data)
- via ftp-ssl using the command line and
- ftps://gdc.cddis.gsfc.nasa.gov/glonass/data/daily/ (for GLONASS-only receiver data)
- ftps://gdc.cddis.gsfc.nasa.gov/gnss/data/daily/ (for GPS+GLONASS receiver data)
How are GLONASS data stored?
GLONASS data are available in daily subdirectories of the form /glonass/data/daily/yyyy/ddd, where yyyy is the four-digit year and ddd is the three-digit day of year. All data are stored in RINEX format.
How can I find out what data are archived?
Users can view CDDIS daily status files, found in the daily GLONASS data directories, which detail data availability for a particular day.
What is the IGEX file?
The file ftps://gdc.cddis.gsfc.nasa.gov/glonass/data/daily/yyyy/ddd/yyn/igexddd0.yyn.Z (yyyy is the four-digit year, yy is the two-digit year, ddd is the three-digit day of year) is the daily broadcast ephemeris file for the GLONASS satellites. This file is a merge of the individual site navigation files into one, non-redundant file that can be utilized by users instead of the many individual navigation files.
What are the data types in the GLONASS daily subdirectories?
Each daily subdirectory under ftps://gdc.cddis.gsfc.nasa.gov/glonass/data/daily/ contains five subdirectories (yy denotes the two-digit year): yyd (compressed, Hatanaka-compacted RINEX observation data), yym (RINEX meteorological data for a subset of sites), yyn (compressed RINEX broadcast ephemeris files), yyo (compressed RINEX observation data), and yys (summary files of the observation data generated by UNAVCO's TEQC software).
How can I use the yyd GLONASS data type?
The RINEX observation data have been "compacted" using software developed by Yuki Hatanaka/GSI and then compressed using standard UNIX compression. By using the Hatanaka software with standard UNIX compression, the RINEX observation files have been reduced in size by a factor of 2.5. Users must first use the UNIX uncompress command (or equivalent software), then run the cmp2rnx software to un-compact the uncompressed file; the resulting file is a GLONASS observation file in RINEX format.
How can I access products derived from GLONASS data?
GLONASS-only derived products are available through encrypted ftp and other methods. GLONASS products (precise ephemerides) since October 1998 are available online.
Access the GLONASS products using one of the following methods:
- via https at URL https://cddis.nasa.gov/archive/glonass/products/
- via ftp-ssl using the command line and ftps://gdc.cddis.eosdis.nasa.gov
Where can I find out more about GLONASS?
The Russian home page on GLONASS is the official source of information about the system.
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