Blackbody Calibration

DOC NOAA NESDIS


Blackbody Calibration



	Correction for GOES Imager Midnight Blackbody Calibration Error
	Description of Problem
	Calibration Correction
	Correction Algorithm
	Slide 5
	Scence Temperature Errors Predicted from Slope Errors vs Time
	Observed Scene Temperature Errors vs Time
	Observed vs Predicted Errors
	Slopes vs Time
	Uncorrected Slopes vs Time
	Corrected Slopes vs Times
	Parallel Test of Midnight Blackkbody Correction (MBCC)
	Slide 13
	Slide 14
	Conclusion

Correction Algorithm

The Midnight Blackbody Calibration Correction (MBCC) was developed to overcome this problem.
The algorithm is based on the observation that when this problem is absent, there is a very high correlation between the calibration slope and the temperature of several optics components, particularly the telescope's primary mirror.
So, when the problem occurs, we replace the bad slope values by estimates computed by regression on the primary-mirror temperature.

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