Degradation Monitoring. - IFE/DLR. Manfred W. Wuttke Envisat Calibration Review 9-13 September 2002 ESTEC, Noordwijk, The Netherlands. The Monitoring Concept.
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Manfred W. Wuttke
Envisat Calibration Review
9-13 September 2002
ESTEC, Noordwijk, The Netherlands
Monitoring the behaviour of SCIAMACHY in-orbit is an essential function during the Commissioning and Routine Operations Phase. It ensures that
M-factors are used in the 0-1b processor to compensate for the radiometric degradation of SCIAMACHY.
In general, a m-factor
Ideally, these reference spectra should be taken on-ground, but in practice this is not possible because measurements of the unobscured sun cannot be performed on-ground.
Therefore, „earliest“ in-flight measurements shall be taken as reference.
Reference spectra have to be determined ASAP!
Instrument seems to show signs of degradation already.
The assumption m-factor = 1 @ “BOL“ is therefore questionable!
For the ASM the aging coeffient can be determined without reference to BOL.
This will give a hint about at least the one assumption
But: Calibrated spectra are needed!
Under these circumstances
is hard to achieve.