Global Navigation Satellite System Clock Solutions from NASA CDDIS

NASA's CDDIS provides daily, 10-second granularity satellite and receiver clock products derived from the International GNSS Service Real-Time Service. These products are combination solutions from multiple global analysis centers, covering GPS, GLONASS, Galileo, Beidou, and other systems since 2011. The dataset is generated from real-time data streams and formatted according to the RTCM SSR standard.

Use Cases

• Precise Point Positioning (PPP) corrections using satellite clock and orbit data.
• Analysis of GNSS constellation performance and clock stability over time.
• Integration with ground receiver data for real-time kinematic (RTK) positioning.
• Research into atmospheric delays and relativistic effects on satellite timing.
• Validation of broadcast ephemeris corrections for safety-critical systems.

Strengths

• Data combines solutions from multiple International GNSS Service analysis centers, improving reliability over any single source.
• Covers multiple global satellite systems (GPS, GLONASS, Galileo, Beidou, etc.) since 2011.
• Provides high-temporal-resolution (10-second granularity) clock products generated daily.

Limitations

• Sources conflict on the exact product type: one describes clock products, another describes orbit products; the core content is ambiguous.
• Critical metadata such as row count, file size, and specific column names are unavailable from all platforms.
• License is specified as 'other-license-specified' without clear terms.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS), from International GNSS Service Real-Time Service submissions.

Collection Method

Derived from decoding and combining real-time product streams from a global network of ground-based receivers.

Time Range

Since 2011 (implied by archive inclusion of newer GNSS).

Freshness

2026-03-13 02:12:11.597072

Geography

Global coverage from satellite constellations and a permanent global ground receiver network.