Global Navigation Satellite System (GNSS) (2024)

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adding new data to EOSDIS

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competitive programs

esds program components

interagency implementation and advanced concepts team (IMPACT)

earth science data and information system (ESDIS) project

earth observing system data and information system (EOSDIS)

distributed active archive centers (DAACS)

system performance and metrics

system components

data system interfaces

The Global Positioning System (GPS) is the U.S. version of a Global Navigation Satellite System (GNSS). A GNSS system like GPS has three components: satellites in well-known orbits with synchronized clocks, ground controllers, and a ground segment providing data to users. Using signals from four satellites, a precise location in three-dimensions (within millimeters or less) along with precise time can be determined. By comparing measurements over time, minute elevation and distance changes at a station can be calculated.