CDDIS: NASA's Archive of Space Geodesy Data
Summary of orbit and clock comparisons of AC and combination RT solutions with IGS rapid solutions

doi: 10.5067/GNSS/gnss_igsrtcsum_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, Summary of orbit and clock comparisons of AC and combination RT solutions with IGS rapid solutions, Greenbelt, MD, USA:NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi: 10.5067/GNSS/gnss_igsrtcsum_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: Summary of orbit and clock comparisons of AC and combination RT solutions with IGS rapid solutions
  • Format: RINEX Extensions to Handle Clock Information
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 2009-01-01 to present
  • Temporal Resolution: Daily
  • File Size: 0.5 MB
  • Platforms: GNSS (e.g., GPS)

Description

The IGS real-time products can be used to determine precise coordinates of the observing stations, gravity field parameters, and Earth orientation parameters. The IGS derived products are essential for Earth science research; multi-disciplinary positioning, navigation, and timing (PNT) applications; and education.

This derived product set consists of a summary comparing the International GNSS Service (IGS) Real-Time Service (RTS) orbit and clock products from all analysis center and combination streams with the IGS rapid products. Global Navigation Satellite System (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 CDDIS provides access to products generated from real-time data streams in support of the IGS Real-Time Service. The real-time observation data from a global permanent network of ground-based receivers are transmitted from the CDDIS in 1 to multi-second intervals in raw receiver or RTCM (Radio Technical Commission for Maritime Services) format.

These real-time data are utilized to generate near real-time product streams. The real-time products consist of GNSS satellite orbit and clock corrections to the broadcast ephemeris. These correction streams are formatted according to the RTCM SSR standard for State Space Representation and are broadcast using the NTRIP protocol. These real-time data are utilized to generate near real-time product streams. The real-time products consist of GNSS satellite orbit and clock corrections to the broadcast ephemeris. These correction streams are formatted according to the RTCM SSR standard for State Space Representation and are broadcast using the NTRIP protocol. The product streams are combination solutions generated by processing individual Real Time solutions from participating IGS Real-time Analysis Centers. The effect of combining the different AC solutions is a more reliable and stable performance than that of any single AC's product. The solution summary files consist of orbit and clock comparisons of all the AC and combination streams against IGS rapid solution. These products have been provided in support of the IGS RTS (previously Real-Time Pilot Project) since February 2009, prior to the availability of real-time product streams. This summary of the combination product is a daily report available approximately one to three days after the end of the previous UTC day.

Data Access

The Summary of orbit and clock comparisons of AC and combination RT solutions with IGS rapid solutions products are online:

ftp://cddis.nasa.gov/gnss/products/rtpp/

Append the following file names to the starting directory

WWWW/ritWWWWD.sum.Z

as described in the table below.

Code Meaning
WWWW GPS week
Dday of week (0-6, 7 indicates weekly)
.Z Unix compressed file

Documentation

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