CDDIS: NASA's Archive of Space Geodesy Data
Daily 30-second GLONASS combined broadcast ephemeris data

doi:10.5067/GNSS/GLONASS_DAILY_B_001

Data Center Citation

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177, http://dx.doi.org/10.1016/j.asr.2010.01.018.

Data Citation

International GNSS Service (IGS). 1992. Daily 30-Second GLONASS combined broadcast ephemeris data [online]. Available from the NASA Crustal Dynamics Data Information System DAAC, Greenbelt, MD, USA at: http://dx.doi.org/10.5067/GNSS/gnss_daily_b_001, Accessed [[enter user data access date]].

Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.

More information about CDDIS data citations and acknowledgments is available.

Summary

  • Name: Daily 30-second GLONASS combined broadcast ephemeris data available from the Crustal Dynamics Data Information System (CDDIS)
  • Format: RINEX V2, UNIX compressed ASCII
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 1992-01-01 to present
  • Temporal Resolution: Daily
  • File Size: 2.5 Mbytes/site/day
  • Platforms: Multiple GNSS

Description

GNSS receivers collect the signals from orbiting satellites to determine their location in three dimensions and calculate precise time. GNSS receivers detect, decode, and process both pseudorange (code) and phase transmitted by the GNSS satellites. The satellites transmit the ranging codes on two or more radio-frequency carriers, allowing the locations of GNSS receivers to be determined with varying degrees of accuracy, depending on the receiver and post-processing of the data. The receivers also calculate current local time to high precision facilitating time synchronization applications.

This dataset consists of ground-based Global Navigation Satellite System (GNSS) GLONASS Combined Broadcast Ephemeris Data (daily files of all distinct navigation messages received in one day) from the NASA Crustal Dynamics Data Information System (CDDIS). GNSS provide autonomous geo-spatial positioning with global coverage. The GLONASS data sets from ground receivers at the CDDIS consist of observations from the Russian GLObal NAvigation Satellite System (GLONASS); Russia's GLONASS is similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. The daily GLONASS broadcast ephemeris files contain one day of GLONASS navigation (30-second sampling) data in RINEX format from a global permanent network of ground-based receivers, one file per day.

Data Access

The daily 30-second GLONASS combined broadcast ephemeris data are online:

in subdirectories by year, day of year, and data type as follows:

YYYY/DDD/YYb/XXXXMRCCC_K_YYYYDDDHHMM_01D_30S_tt.FFF.gz

Code Meaning
YYYY4-digit year
DDD 3-digit day of year
YY2-digit year
t
XXXX4-character IGS station name
Mmonument or marker number (0-9)
Rreceiver number (0-9)
CCCISO country code
KData source:

R = From Receiver data using vendor or other software
S = From data Stream (RTCM or other)
U = Unknown
YYYY4-digit Gregorian year
DDD 3-digit day of year
HH 2-digit hour
MM 2-digit minute
tt type of data:

GO = GPS Observation data
RO = GLONASS Observation data
EO = Galileo Observation data
JO = QZSS Observation data
CO = BDS Observation data
IO = IRNSS Observation data
SO = SBAS Observation data
MO = Mixed Observation data
GN = GPS Navigation data
RN = GLONASS Navigation data
EN = Galileo Navigation data
JN = QZSS Navigation data
CN = BDS Navigation data
IN = IRNSS Navigation data
SN = SBAS Navigation data
MN = Navigation data (All GNSS Constellations)
MM = Meteorological Observation
FFF File format:

rnx = RINEX
crx = Hatanaka Compressed RINEX
.gz Compressed file

Documentation

http://cddis.nasa.gov/Data_and_Derived_Products/GNSS/daily_30second_data.html