Calibration of VISSR on board GMS-5

Details Calibration of VISSR on board GMS-5 Calibration of VISSR on board GMS-5

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19.1297t&link_type=abstract

Advances in Space Research, Volume 19, Issue 9, p. 1297-1306.

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Scientific paper

Operational Calibration method of visible and IR channels of GMS-5 VISSR is as follows. In the visible channel, albedo is computed by the following equation. A={(C-b_0)/b_1}^2/a-V_0/a, where C and V_0 are digital counts from VISSR and V_0 is bias voltage corresponding to 0 albedo respectively, other coefficients are determined from prelaunch test data. A principle of IR channel calibration depends upon a linear relation between incoming IR radiance and output voltage of IR channel. Taking the space as a cold source and a calibration shutter in VISSR as a high source, a calibration regression equation to convert output voltage of IR channel into temperature is determined. A little correction is necessary to compensate non-linear response characteristics of IR detector at low temperature. To cope with a malfunction of calibration shutter (not frequent occurrence) a method of calibration without a shutter information is developed. The monitoring of solar radiance for one year indicates a small degradation in visible channel detectors. The degradation among 4 detectors is not uniform.

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