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The GRAS Instrument
The GRAS instrument (Global navigation satellite systems Receiver for Atmospheric Sounding) is a GPS receiver. It is a new instrument being developed by the instrument prime Saab Ericsson Space in Sweden, under contract to ESA/Eumetsat. The GRAS provides a minimum of 500 atmospheric profiles per day by a process of GPS radio occultation. Gras will provide atmospheric soundings of the temperature and humidity of the Earth atmosphere. In addition GRAS will provide navigation solutions of the MetOp satellite position along its orbit. These profiles will be assimilated into Numerical Weather Prediction (NWP) models.
Relevant links with more information:
ESA's GRAS page
ESA Bulletin papers:
ESA Bulletin 102 article about GRAS
ESA Bulletin 102 article about Metop
GRAS SAF Open Loop Workshop, 6-8 June 2005, Denmark.
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Copyright 2007 (C) GRAS SAF
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