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NASA CDDIS provides weekly Satellite Laser Ranging (SLR) final orbit products from the International Laser Ranging Service (ILRS) Combination Center. The data consists of weekly files generated with a typical 3-day delay, containing precise satellite positions and velocities. SLR measurements provide millimeter-precision range data used for geophysical modeling and precise orbit determination.
Files are in extended SP3 format and span 7 days from 00:00 to 23:45 UTC.