Global Navigation Satellite System Data from NASA CDDIS

Global satellite positioning data from the U.S. GPS and Russian GLONASS constellations, plus other international systems, managed by NASA's Crustal Dynamics Data Information System (CDDIS). The GPS constellation has been fully operational since 1994, comprising 24 satellites and three active spares in 12-hour orbits 20,200 kilometers above Earth. This dataset is sourced from receivers that detect, decode, and process signals from these satellites.

Use Cases

• Analyzing satellite orbit and clock data for precise point positioning (PPP) calculations.
• Studying signal propagation delays to model ionospheric and tropospheric effects on radio waves.
• Calibrating and validating data from ground-based GNSS receiver networks.
• Supporting research in crustal dynamics, plate tectonics, and Earth orientation parameters.

Strengths

• Data originates from the authoritative NASA CDDIS, a primary data center for space geodesy.
• Covers multiple major global systems (GPS, GLONASS), providing a multi-constellation perspective.
• GPS system has been providing continuous global data since becoming fully operational in 1994.

Limitations

• Specific column names, row counts, and dataset size are not provided by any source, limiting detailed assessment.
• Sources disagree on license: Data.gov specifies 'other-license-specified', while NASA Earthdata lists no license.
• The most complete temporal coverage and specific data collection methodology are not detailed.

Provenance

Source

National Aeronautics and Space Administration (NASA) Crustal Dynamics Data Information System (CDDIS)

Collection Method

Signals detected, decoded, and processed by GNSS receivers from satellite constellations.

Time Range

GPS fully operational since 1994; specific data date range not provided.

Freshness

2026-03-13 01:51:11.899840

Geography

Global