Global navigation satellite system Receiver for Atmospheric Sounding Data Assessment
Entry ID: GRAS_ESA_01

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Abstract: The entire GRAS (Global Navigation Satellite System Receiver for Atmospheric Sounding) instrument weighs about 30 kg and comprises three antenna-receivers positioned separately on MetOp. One of the antennae, the GVA antenna, points in the velocity direction of the satellite, another, the GAVA antenna points in the anti-velocity direction, and the smaller GZA antenna points zenith.

The GVA and ... View entire text
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Caption:  GRAS's zenith-pointing antenna tracks a number of GPS satellites in range.
Description:  Credits: ESA - AOES Medialab

Geographic Coverage
Spatial coordinates   
  N: 90.0   S: -90.0   E: 180.0   W: -180.0

Access Constraints Access to Data during Commissioning

Users should note that until the entry into operational service, the priority is given to commissioning activities. The early access to EPS data is therefore provided on a best effort basis, without full service commitment. This implies that schedule changes might occur at any time and that dissemination might be interrupted due to other commissioning activities. Data delivered during commissioning are not considered to be validated data. The data disseminated via EUMETCast will be access controlled.

Use Constraints Disclaimer - Status of instrument and processing quality (August 2007)

Data quality assessment is ongoing, so while the data are acceptable for this stage of commissioning no guarantee of quality will yet be given. Please note: Only the so-called key fields have been tested for acceptable values. These key fields are found in the MDR-1B (see the Products Guide) of the GRAS product.

Data Center
European Meteorological Satellite Organisation Supplemental Info
Data Center URL:

Data Center Personnel
Phone: +49 6151 807345
Fax: +49 6151 807538
Contact Address:
Am Kavalleriesand 31
City: Darmstadt
Province or State: Hessen
Postal Code: D-64295
Country: Germany
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
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Creation and Review Dates
DIF Creation Date: 2007-09-14
Last DIF Revision Date: 2011-03-15
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