NASA CDDIS GNSS Broadcast Ephemeris Data with 30-Second Sampling

NASA's Crustal Dynamics Data Information System provides hourly files of combined Global Navigation Satellite System broadcast ephemeris data. The dataset contains 30-second sampled navigation messages from a global network of ground receivers, covering multiple systems including GPS, GLONASS, Galileo, and Beidou since 2011. Files are stored in RINEX format.

Use Cases

• Training machine learning models for satellite orbit prediction using broadcast ephemeris parameters.
• Validating precise point positioning algorithms by comparing broadcast orbits with precise products.
• Analyzing signal structure and constellation performance across multiple GNSS systems (GPS, GLONASS, Galileo, Beidou).
• Studying long-term trends in broadcast clock corrections for time-series anomaly detection.
• Calibrating atmospheric delay models using the timing data from global ground receiver stations.

Strengths

• Data originates from NASA's authoritative CDDIS archive, a primary node for space geodesy data.
• Includes multiple global navigation systems (GPS, GLONASS, Galileo, Beidou, QZSS, IRNSS, SBAS) since 2011.
• Provides high-temporal-resolution data with 30-second sampling of navigation messages.
• Sourced from a global permanent network of ground-based receivers, ensuring wide geographic coverage.

Limitations

• Exact row count, file size, and complete column schema are not provided by any source.
• One source lists a license as 'other-license-specified' while another lists 'None', creating a conflict.
• Data is provided in specialized RINEX format, requiring domain-specific knowledge for processing.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS)

Collection Method

Collected from a global permanent network of ground-based GNSS receivers, with hourly files generated from distinct navigation messages.

Time Range

Data available from at least 2011 to present.

Freshness

2026-03-13 03:26:16.706764

Geography

Global coverage from the permanent receiver network.