The GNSS is a space-based radio navigation and positioning system that provides users with all-weather 3D coordinates and speed and time information at any location on the Earth's surface or near-Earth space. GPS applications: positioning of precision agriculture, scientific research (field biology, meteorology, earth sciences), environmental monitoring, emergency and disaster assessment, safety assurance, celestial and architectural engineering, and natural resource analysis. Satellite navigation systems have brought enormous social and economic benefits to human beings. To date, relatively complete satellite navigation systems already have US GPS and Russian GLONASS systems, and Europe plans to launch its own satellite navigation system Galileo.
It is estimated that by 2020, the four major GNSS systems of US GPS, Russian GLONASS, EU GALILEO and China Beidou satellite navigation system will be completed or completed.
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