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NASA's Crustal Dynamics Data Information System (CDDIS) archives high-rate broadcast ephemeris data from multiple Global Navigation Satellite Systems (GNSS). The dataset includes sub-hourly files for the Indian Regional Navigation Satellite System (IRNSS) and the Russian GLONASS system, each containing 15 minutes of navigation data in RINEX format from a global network of receivers. Since 2011, the archive has expanded to include data from Galileo, Beidou, QZSS, and Satellite Based Augmentation Systems (SBAS).
License is listed as 'other-license-specified'; users should verify terms on the CDDIS website. Data is stored in RINEX format, requiring specialized software for processing.