doi: 10.5067/GNSS/gnss_hourly_n_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, http://dx.doi.org/10.1016/j.asr.2010.01.018.

Data Citation

International GNSS Service, Hourly 30-second GPS broadcast ephemeris data, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/GNSS/gnss_hourly_n_001.

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: Hourly 30-second GPS broadcast ephemeris data
• Format: RINEX V2, UNIX compressed ASCII
• Spatial Coverage: 90.0N to -90.0S, 180.0E to -180.0W
• Temporal Coverage: 2005-10-07 to present
• Temporal Resolution: Hourly
• File Size: 200 Kbytes/site/day
• Platforms: GPS, GLONASS

Description

The 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) GPS Broadcast Ephemeris Data (hourly files) from the NASA Crustal Dynamics Data Information System (CDDIS). 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. The hourly GPS broadcast ephemeris files contain one day of GPS broadcast navigation data in RINEX format from a global permanent network of ground-based receivers, one file per site.

Data Access

The hourly 30-second GNSS GPS broadcast ephemeris data are online:

Append the following directory and file names tot he starting directory using the format codes in the links below:

Documentation

http://cddis.nasa.gov/Data_and_Derived_Products/GNSS/hourly_30second_data.html