Description: The NAVSTAR GPS (NAVigation Satelllite Timing And Ranging Global Positioning
System) is an all-weather, space-based navigation system developed by the U.S.
Department of Defense to determine ones position, velocity, and time accurately in a
common reference system on the Earth. The present constellation consists of nominally 24
satellites and provides global coverage with four to eight satellites simultaneously observed
above 15 ? elevation.
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03.20180.SMShrestha_модели тропосферы и т.д..pdf