The Global Navigation Satellite System (GNSS) International GNSS Service (IGS) Multi-GNSS Experiment (MGEX) Products can be found at this doi: 10.5067/GNSS/GNSS_IGSMGEXP_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, https://doi.org/10.1016/j.asr.2010.01.018.
Data Citation
International GNSS Service, Global Navigation Satellite System (GNSS) IGS Multi-GNSS Experiment (MGEX) Products from NASA CDDIS, Greenbelt, MD, USA: NASA Crustal Dynamics Data Information System (CDDIS), Accessed [enter user data access date] at doi:110.5067/GNSS/GNSS_IGSMGEXP_001.
Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.
Learn more about NASA’s Crustal Dynamics Data Information System (CDDIS) data citations and acknowledgments.
Summary
- Name: Global Navigation Satellite System (GNSS) IGS Multi-GNSS Experiment (MGEX) Products
- Format: SINEX, SP3, ASCII
- Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
- Temporal Coverage: 2011-01-01 to present
- Temporal Resolution: Weekly
- File Size: 250MB/week
- Platforms: GPS, GLONASS, Galileo, BeiDou
Description
This derived product set consists of GNSS satellite orbit products (daily files, generated daily) from the real-time IGS analysis center submissions available from CDDIS. GNSS satellites provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, CDDIS's 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. These products include satellite orbit, satellite and station clock, and station position solutions. They are generated multi-GNSS data in support of the IGS Multi-GNSS Experiment (MGEX). The observation data from a global permanent network of ground-based receivers are transmitted from the CDDIS and downloaded by analysis centers who generate these MGEX products. Access more information about the MGEX data holdings.
Data Access
MGEX products are online:
Append the following directory and file names to the starting directory:
| Directory | File Name |
|---|---|
| WWWW/AAAWWWWD.TYP.Z | GPS weeks prior to 1945 |
| WWWW/AAAVMGXTTT_YYYYDDDHHMM_LEN_SMP_CNT.FMT.gz | GPS weeks 1945 and after |
as described in the tables below.
GPS Weeks Prior to 1945
| Code | Meaning | |
|---|---|---|
| WWWW | GPS week | |
| AAA | analysis center name/type of solution | |
| com | Center for Orbit Determination in Europe (CODE) | |
| gbm | GeoForschungsZentrum (GFZ) | |
| grm | Groupe de Recherche de Géodésie Spatiale (GRGS) | |
| tum | Technical University of Munich | |
| wum | Wuhan University | |
| D | day of week (0-6, 7 indicates weekly) | |
| TYP | type of solution | |
| bia | GNSS bias solutions in SINEX BIAS format | |
| clk | Satellite and station clocks | |
| erp | Earth orientation parameter solution | |
| snx | Station positions in SINEX format | |
| sp3 | Orbits in SP3C format | |
| .Z | UNIX compressed file | |
GPS Weeks 1945 and Onward
| Code | Meaning | |
|---|---|---|
| WWWW | GPS week | |
| AAA | analysis center name | |
| COD | CODE | |
| GFZ | GFZ | |
| GRG | GRGS | |
| JAX | Japan Aerospace Exploration Agency (JAXA) | |
| SHA | Shanghai Observatory | |
| TUM | Technical University of Munich | |
| WUM | Wuhan University | |
| V | 1-char version/solution identifier; nominally 0 | |
| TTT | 3-char product type specification; | |
| RAP | rapid | |
| FIN | final | |
| YYYY | 4-digit year of start epoch | |
| DDD | 3-digit day-of-year of start epoch | |
| HH | 2-digit hour of start epoch: 00 | |
| MM | 2-digit minute of start epoch: 00 | |
| LEN | 2-digits+1-character intended (nominal) product period: | |
| 01D | for 1 day | |
| 01Y | for 1 year | |
| ??L | for coverage interval in months | |
| SMP | 2-digits+1-character sampling interval: | |
| 01D | 1-day averages | |
| 07D | 7-day averages | |
| CNT | 3-character content type: | |
| ERP | Earth rotation parameters | |
| CLK | Receiver and/or satellite clock parameters | |
| ORB | Satellite orbits | |
| OSB | Observable-specific signal bias | |
| SOL | Variance/covariance information or normal equations in SINEX | |
| FMT | 3-character file format: | |
| CLK | clock RINEX | |
| BIA | bias SINEX | |
| ERP | IGS ERP format | |
| SNX | Solution INdependent EXchange (SINEX) format | |
| SP3 | Standard Product 3 (SP3) orbit format | |