GUARDIAN GLONASS Real-Time Clock Corrections from NASA CDDIS

NASA CDDIS hosts the GUARDIAN GLONASS daily accumulated real-time Precise Orbit Determination (POD) Clock Corrections. The dataset provides a high-rate time series of clock biases and their formal 1-sigma uncertainties for healthy GLONASS satellites, sampled every minute and generated in real-time by JPL's Global Differential GPS Operations Centers. Daily files can be concatenated to extend temporal coverage.

Use Cases

• Analyzing temporal stability and performance of GLONASS satellite atomic clocks using the minute-by-minute clock bias time series.
• Improving real-time precise point positioning (PPP) solutions by applying the provided clock corrections and their formal 1-sigma uncertainties.
• Studying high-frequency variations in signal propagation delays for atmospheric sensing applications.
• Concatenating daily files to create long-term time series for trend analysis of GLONASS clock behavior.

Strengths

• Provides formal 1-sigma uncertainty estimates for each clock correction, enabling error-aware analysis.
• Data is generated in real-time by JPL's Global Differential GPS Operations Centers, supporting time-sensitive applications.
• High temporal resolution with corrections accumulated every minute allows for analysis of short-term clock variations.

Limitations

• Critical metadata such as row count, file size, and specific column names are unavailable across all sources.
• The license is ambiguously listed as 'other-license-specified' on some platforms and 'None' on others, requiring further investigation for use.
• Data is limited to healthy satellites in the GLONASS constellation, excluding other GNSS systems.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS), generated by JPL's Global Differential GPS Operations Centers.

Collection Method

Real-time generation from ground-based GNSS observations as part of the GUARDIAN network.

Time Range

Coverage is daily; concatenation of files can provide larger temporal coverage.

Freshness

2026-03-13 01:34:50.478809

Geography

Global coverage, derived from a ground-based network.