Acta Optica Sinica, Volume. 40, Issue 10, 1011001(2020)
On-Orbit Detection and Correction of Crosstalk Effect of FY-3D MERSI-II Signals
Figures & Tables(12)
Fig. 2. Polar island images of earth observed by MERSI-II with equalization enhancement (2019-07-18). (a) Band 20; (b) band 21
Fig. 3. Fire point target images of earth observed by MERSI-II with Gaussian enhancement (2019-03-18). (a) Band 20; (b) band 21
Fig. 4. Polar island images of earth observed by MERSI-II with Gaussian enhancement (2019-07-18). (a) Band 6; (b) band 7
Fig. 5. Lunar images obtained by single-detector multi-frame scanning in short-wave infrared focal plane (2017-12-26). (a) Band 5 detector 5; (b) band 6 detector 5
Fig. 6. Lunar images obtained by single-detector multi-frame scanning in mid and long wave infrared focal plane (2017-12-26). (a) Band 21 detector 5; (b) band 23 detector 5
Fig. 7. Schematic of crosstalk from bands in mid and long wave infrared focal plane. (a) Lunar pseudo-color image of band 20 detector 5; (b) schematic of the lunar arrangement of each band
Fig. 8. Lunar images of band 20 before and after crosstalk correction (2017-12-26). (a) Without correction; (b) with correction
Fig. 9. Lunar image of band 20 before and after crosstalk correction (2018-01-25). (a) Without correction; (b) with correction
Fig. 10. Earth images of band 20 before and after crosstalk correction (2018-01-29). (a) Without correction; (b) with correction
Table 1. Crosstalk detection results of all bands of MERSI-II
View tableTable 1. Crosstalk detection results of all bands of MERSI-II
Wavelength range Band Wavelength /μm Source of crosstalk Crosstalk proportion 1 0.470 No Visible (VIS) 2 0.550 No 3 0.650 No 4 0.865 No 5 1.380 From detectors 25%--40% Short-wave infrared (SWIR) 6 1.640 From detectors 7%--20% 7 2.130 No 8 (det1) 0.412 From detectors 3%--4% 9 0.443 No 10 0.490 No 11 0.555 No 12 0.670 No 13 0.709 No Visible and near-infrared (VNIR) 14 0.746 No 15 0.865 No 16 0.905 No 17 0.936 No 18 0.940 No 19 1.030 No 20 3.800 From bands 1.3%--3% Mid and long wave infrared (MLWIR) 21 4.050 From bands 1.2%--1.7% 22 7.200 From bands Saturation 23 8.550 From bands 3.5%--5% Long-wave infrared (LWIR) 24 10.800 From bands 1.5%--2.5% 25 12.000 From bands 0%--1%
Table 2. Crosstalk coefficient summary of band 20 detector 5 (2017-12-26)
View tableTable 2. Crosstalk coefficient summary of band 20 detector 5 (2017-12-26)
Detector Band 21 Band 23 Band 22 Det1 0.00105634 1.22514515×10-3 0.00086126 Det2 0.00544265 3.43000244×10-4 0.00128618 Det3 0.00217129 1.09546923×10-3 0.00149434 Det4 0.00365741 6.22984547×10-5 0.00100561 Det5 -0.00042805 5.82319004×10-4 0.00124892 Det6 0.02883502 2.74452948×10-4 0.00197744 Det7 0.00882859 1.02648869×10-3 0.00065176 Det8 0.00263379 7.59549995×10-4 0.00150834 Det9 0.00177946 6.57615186×10-4 0.00068722 Det10 0.00385918 1.03962834×10-3 0.00109455
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Da Xiao, Na Xu, Xiuqing Hu, Ronghua Wu, Xinhua Niu, Xianghua Wang, Yuqing He. On-Orbit Detection and Correction of Crosstalk Effect of FY-3D MERSI-II Signals[J]. Acta Optica Sinica, 2020, 40(10): 1011001
Paper Information
Category: Imaging Systems
Received: Dec. 30, 2019
Accepted: Feb. 14, 2020
Published Online: Apr. 28, 2020
The Author Email: Xu Na (xuna@cma.gov.cn)
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