GNSS Receiver for Atmospheric Sounding

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A Global Positioning System (GPS) receiver, carried by MetOp satellites, that functions as an atmospheric-sounding instrument. By receiving GPS signals, data from GRAS may be used to obtain temperature and humidity profiles at least 500 times a day. When combined with time and position data from the GPS signals, GRAS observations may be entered directly into numerical weather prediction models.

Subjects: Meteorology and Climatology.

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