High-rate data

The CDDIS archive contains GNSS data from the global network of permanent GNSS receivers operating at a higher, 1-second sampling rate. These data are submitted and archived in files containing 15 minutes of data. IGS analysis centers retrieve these sub-hourly data files to produce IGS near real-time and "ultra-rapid" products such as satellite ephemerides, clocks, and Earth rotation parameters.

IGS stations forward the sub-hourly 1-second GNSS data in compressed RINEX format to the CDDIS within minutes following the end of the 15-minute time block. At the present time, sub-daily data from an average of 160-170 high-rate sites are archived each day. Many of the sites are real-time, streaming sites whose data are captured and translated into blocks of 15-minutes of RINEX data. High-rate GNSS data available in RINEX V2 format use the mmmmDDDHMM.YYt.Z filename convention and are in UNIX compressed format. Starting with data from 2016, all high-rate GNSS data in RINEX V3 that use the RINEX V3 filenaming convention and the gzip compression format are archived with data in RINEX V2 format, in subdirectories in the /gnss/data/highrate area.

The starting directory for these sub-hourly, high-rate files is:

ftp://cddis.gsfc.nasa.gov/gnss/data/highrate/

Append the following directory names to the starting directory to access individual files:

YYYY/DDD/YYt/HH/

where:

Code Meaning
YYYY4-digit year
DDD3-digit day of year
YY2-digit year
ttype of data:

d = Hatanaka-compressed observation data
g = GLONASS broadcast ephemeris data
m = compressed meteorological data
n = GPS broadcast ephemeris data
HH 2-digit hour of day (00, 01, ..., 23)

Append the following file names using the format codes below:

mmmmDDDHMM.YYt.ZRINEX V2 format View code table

XXXXMRCCC_K_YYYYDDDHHMM_15M_01S_tt.FFF.gzRINEX V3 format View code table