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    ESA > Our Activities > Observing the Earth > The Living Planet Programme > Meteorological missions > MetOp

    GRAS performance

    Measured temperature accuracy 1K
    Number of occultation channels (set + rise) 4
    Number of navigation channels 8
    Number of occultations per day 500
    Horizontal resolution 100 to 300 km
    Vertical resolution Fresnel zone
    (stratosphere, troposphere)
    300 to 1500 m
    High Vertical resolution (troposphere) 100 m
    Navigation solution accuracy 100 m
    USO frequency stability 1 x 10-12
    Bending angle budget @ 30 km 0.42 mrad

    Mass 26 kg
    Power 37 W
    Data rate (mean, max) 27 kb/s
    60 kb/s
    Occultation antennas                           
    Gain 9 to 10 dBi
    Elevation angle -25.5 to -28.3°
    Azimuth angle ± 55°
    Navigation antenna
    Gain -4 to +7 dBi
    Elevation angle 15 to 90°
    Azimutz angle 360°

    Last update: 28 June 2006

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    • In depth
    • About GRAS
    • Description
    • Instrument design
    • Performance
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    • Ground Processor Prototype
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