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25 May 2018 On-orbit polarization sensitivity evaluation of FY-3B MERSI
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Abstract
Medium Resolution Spectral Imager (MERSI) onboard FY-3 was a MODIS-like sensor which was designed for application in land, ocean and atmosphere. However, the prelaunch characterization of MERSI was not sufficient. The polarization property was not measured, which would influence the accuracy of sensor radiometric measurement, especially at scan edges. To evaluate the polarization sensitivity after launch, an ocean target based method was presented to model the Stokes vector entering the sensor at the top of atmosphere, and the on-orbit polarization response coefficients were estimated by regression between the modeled and measured radiance. After testing with Aqua MODIS, the method was applied to FY-3B MERSI. It revealed that there was relatively large polarization sensitivity for FY-3B MERSI visible bands. For the most sensitive band at 412nm, the polarization factor is approximately twice of that for Aqua MODIS. The mean polarization factors are above 3% for blue bands. For 412-nm band, the TOA polarization correction range is 16% for FY-3B MERSI, while 7% for Aqua MODIS on the same day.
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Ling Sun, Lei Gao, Danyang Cao, and Ran Huo "On-orbit polarization sensitivity evaluation of FY-3B MERSI", Proc. SPIE 10631, Ocean Sensing and Monitoring X, 1063116 (25 May 2018); https://doi.org/10.1117/12.2311439
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