ILRS SLR: Daily Satellite Laser Ranging Station Positions and Earth Rotation Parameters

Satellite Laser Ranging provides unambiguous range measurements to millimeter precision, the only space geodetic technique to do so. The International Laser Ranging Service (ILRS) generates this official combined product of daily station positions and Earth Orientation Parameters, produced daily with a typical 2-day delay. Analysis of this data contributes to the terrestrial reference frame, gravitational field modeling, and monitoring of the Earth's center of mass.

Use Cases

• Contributing to the International Terrestrial Reference Frame based on precise station positions and velocities.
• Modeling spatial and temporal variations in Earth's gravitational field based on SLR-derived geophysical parameters.
• Monitoring millimeter-level variations in the Earth's center of mass for solid Earth-atmosphere-oceans studies.
• Providing precise orbit determination for spaceborne radar altimeter missions using SLR data.
• Conducting tests of the Theory of General Relativity based on sub-nanosecond global time transfer capabilities.

Strengths

• Provides unambiguous range measurements to millimeter precision.
• Represents the official, most consistent, and highest quality combined solution from the International Laser Ranging Service.
• Data files are generated daily with a typical delay of 2 days, suggesting regular updates.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total dataset size are unknown, which may limit suitability assessment.

Provenance

Source

NASA Crustal Dynamics Data Information System (CDDIS), via the International Laser Ranging Service (ILRS) Combination Center.

Collection Method

Derived product combining solutions from ILRS Analysis Centers to generate final station position and Earth Rotation Parameter files.

Freshness

Files are generated daily.

Geography

Global ILRS station network.