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GRAS performance
 
Measured temperature accuracy1K
  
Number of occultation channels (set + rise)4
Number of navigation channels8
Number of occultations per day500
  
Horizontal resolution100 to 300 km
Vertical resolution Fresnel zone
(stratosphere, troposphere)
300 to 1500 m
High Vertical resolution (troposphere)100 m
Navigation solution accuracy100 m
  
USO frequency stability1 x 10-12
Bending angle budget @ 30 km0.42 mrad
 
 
Mass26 kg
Power37 W
Data rate (mean, max)27 kb/s
60 kb/s
  
Occultation antennas                            
Gain9 to 10 dBi
Elevation angle-25.5 to -28.3°
Azimuth angle± 55°
  
Navigation antenna 
Gain-4 to +7 dBi
Elevation angle15 to 90°
Azimutz angle360°
 
 
Last update: 28 June 2006
 
 
 
In depth 
»About GRAS 
»Description 
»Instrument design 
»Products 
»Calibration/validation 
»Ground Processor Prototype 
Related articles 
»Measuring atmospheric temperature and humidity with GRAS 
MetOp's instruments 
»A/DCS 
»AMSU-A1 
»AMSU-A2 
»ASCAT 
»AVHRR 
»GOME-2 
»GRAS 
»HIRS 
»IASI 
»MHS 
»SARP-3 
»SARR 
»SEM 
 
 
 
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