High-Rate GNSS Broadcast Ephemeris Data from Global Ground Stations

NASA's Crustal Dynamics Data Information System (CDDIS) archives high-rate broadcast ephemeris data from multiple Global Navigation Satellite Systems (GNSS). The dataset includes sub-hourly files for the Indian Regional Navigation Satellite System (IRNSS) and the Russian GLONASS system, each containing 15 minutes of navigation data in RINEX format from a global network of receivers. Since 2011, the archive has expanded to include data from Galileo, Beidou, QZSS, and Satellite Based Augmentation Systems (SBAS).

Use Cases

• Precise satellite orbit determination based on broadcast ephemeris data.
• Ionospheric and tropospheric delay analysis for atmospheric science.
• Crustal motion and plate tectonic studies using high-rate GNSS observations.
• Time synchronization and clock error analysis for satellite constellations.
• Validation of satellite-based augmentation system (SBAS) performance.

Strengths

• Data originates from the authoritative NASA CDDIS archive, a primary node for space geodesy data.
• Provides high-rate (1-second) data, enabling detailed temporal analysis for precise applications.
• Includes data from multiple global GNSS constellations (GPS, GLONASS, Galileo, Beidou, QZSS, IRNSS, SBAS) since 2011.

Limitations

• Column names and specific data structure are not provided in the source metadata, limiting immediate understanding of the file contents.
• Conflicting metadata: one source lists a last update of 2026-04-10, while others show no update information.
• The dataset's size, row count, and specific license details are largely unspecified across sources.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS)

Collection Method

Collected from a global permanent network of ground-based GNSS receivers.

Time Range

Data collection includes archives from at least 2011 onward.

Freshness

Last updated on 2026-04-10 according to two sources.

Geography

Global coverage from the permanent ground receiver network.