Abstract
The Visible IR spin–scan radiometer Atmospheric Sounder (VAS) is the first sounding instrument placed in geostationary orbit. The calibration procedure for determining VAS radiances requires modeling the contributions of the telescope foreoptics components to the background radiation. A simple relation between target radiance and detector output voltage is derived. The calibration procedure is successfully tested by comparisons with HIRS and radiosonde data. After removing a negative offset of up to 3°C in three of the upper atmospheric CO2 bands of VAS, the capability to produce accurate soundings (within 2°C of radiosonde) was demonstrated.
© 1981 Optical Society of America
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