doi:10.5067/GNSS/gnss_daily_multi_b_001

• Data Center Citation
• Data Citation
• Summary
• Description
• Data Access
• Documentation

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, https://doi.org/10.1016/j.asr.2010.01.018.

Data Citation

International GNSS Service (IGS). 1992. Daily multi-GNSS broadcast ephemeris data [online]. Available from the NASA Crustal Dynamics Data Information System DAAC, Greenbelt, MD, USA at: http://doi.org/10.5067/GNSS/gnss_daily_multi_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 multi-GNSS broadcast ephemeris data available from the Crustal Dynamics Data Information System (CDDIS)
• Format: RINEX V3 UNIX compressed ASCII
• Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
• Temporal Coverage: 2013-01-01 to present
• Temporal Resolution: Daily
• File Size: 1.3 Mbytes/day
• Platforms: multi-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 multi-GNSS (Global Navigation Satellite System) Broadcast Ephemeris Data. GNSS satellites provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe's Galileo, China's Beidou, Japan's Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. Colleagues at the Technical University in Munich (TUM) and Deutsches Zentrum für Luft- und Raumfahrt (DLR) provide to the CDDIS a merged, multi-GNSS broadcast ephemeris file containing GPS, GLONASS, Galileo, BeiDou, QZSS, and SBAS ephemerides. The file is generated from real-time streams and contains all unique broadcast navigation messages for the day.

Data Access

The starting directory for the daily multi-GNSS broadcast ephemeris data is:

in subdirectories by year and day of year as follows:

Append the following directory and file names to the starting directory using the format codes in the table below:

YYYY/brdc/BRDM00DLR_S_YYYYDDD0000_01D_MN.rnx.gz

OR

YYYY/DDD/YYp/BRDM00DLR_S_YYYYDDD0000_01D_MN.rnx.gz

The daily multi-GNSS broadcast ephemeris files were previously also archived in short filename format through the summer of 2020. These files were stored in the MGEX campaign subdirectories at this starting directory:

in subdirectories by year and day of year as follows:

Append the following directory and file names to the starting directory using the format codes in the table below:

YYYY/brdm/brdmDDD0.YYp.Z

Code	Meaning
YYYY	4-digit year
DDD	3-digit day of year
YY	2-digit year
.gz	gzipped file
.Z	Unix compressed file

Documentation

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