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Global Navigation Satellite System data combines signals from the U.S. GPS and Russian GLONASS constellations, plus other international systems. The GPS system has been fully operational since 1994, with a constellation of 24 satellites and three active spares orbiting at 20,200 kilometers. This dataset from NASA CDDIS provides high-rate observations sampled at 1-second intervals.
License details are unclear; the 'other-license-specified' tag requires further investigation. Data is provided in BIN and ISO file formats, which may require specialized software for processing.