Acta Optica Sinica, Volume. 44, Issue 12, 1228005(2024)
Stability Analysis of Radiometric Properties in Visible On-Board Calibration System of FY-3B Satellite Medium-Resolution Spectral Imager
Figures & Tables(11)
Fig. 1. Illustration of visible on-board calibration (VOC) system radiometric properties stability analysis
Fig. 2. MERSI VOC. (a) Schematic of VOC system; (b) three-dimensional structure of lens optical axis point of VOC
Fig. 3. Sunlight-based calibration. (a) MERSI band 1 DN value as a function of solar zenith; (b) multiyear sunlight-based calibration DN value for MERSI band 1
Fig. 4. Variation of DN values for sunlight-based calibration MERSI 17 reflective solar bands (band 6 and band 7 are not under consideration)
Fig. 5. Time series of TOA reflectance measured by MODIS versus BRDF model fitting. Measured data are represented as M, and model fitted data are represented as F
Fig. 7. MERSI absolute radiometric response degradation trends based on cross calibration with MODIS
Fig. 8. Lifetime plots of comparison of VOC system normalized radiometric output for wavelengths centered at 550 nm and 650 nm between results given by proposed method and those obtained from trap detectors
Table 1. Basic information for MERSI system
View tableTable 1. Basic information for MERSI system
Band Central wavelength /μm Bandwidth /μm Instantaneous field of view /m Noise equivalent reflectance ρ /% or
temperature difference（300 K）（reported for Band 5）
Dynamic
range
1 0.470 0.05 250 0.45 100% 2 0.550 0.05 250 0.40 100% 3 0.650 0.05 250 0.40 100% 4 0.865 0.05 250 0.45 100% 5 11.25 2.5 250 0.4 K 330 K 6 1.640 0.05 1000 0.08 90% 7 2.130 0.05 1000 0.07 90% 8 0.412 0.02 1000 0.10 80% 9 0.443 0.02 1000 0.10 80% 10 0.490 0.02 1000 0.05 80% 11 0.520 0.02 1000 0.05 80% 12 0.565 0.02 1000 0.05 80% 13 0.650 0.02 1000 0.05 80% 14 0.685 0.02 1000 0.05 80% 15 0.765 0.02 1000 0.05 80% 16 0.865 0.02 1000 0.05 90% 17 0.905 0.02 1000 0.10 90% 18 0.940 0.02 1000 0.10 90% 19 0.980 0.02 1000 0.10 90% 20 1.030 0.02 1000 0.10 90%
Table 2. TOA BRDF model fitting coefficients
View tableTable 2. TOA BRDF model fitting coefficients
Band 1 Band 2 Band 3 Band 4 Band 5 Band 6 Band 7 f1 0.46750 0.59360 0.24576 0.34024 0.68450 0.73530 0.67400 f2 0.04372 0.06804 0.10440 0.03596 0.18533 0.19240 0.17271 f3 0.02368 0.02920 0.00302 0.00910 0.04741 0.05273 0.05296 RMS 0.007762 0.009020 0.006093 0.006434 0.011420 0.012120 0.012970
Table 3. VOC system radiometric performance annual degradation rates (%) at different central wavelengths (nm)
View tableTable 3. VOC system radiometric performance annual degradation rates (%) at different central wavelengths (nm)
Year 470 550 650 865 412 443 490 520 565 650 685 765 865 905 940 980 1030 B1 B2 B3 B4 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 2010 2.70 1.93 2.65 1.73 2.92 2.67 2.78 2.79 2.01 2.61 2.57 2.17 1.91 1.50 1.10 1.11 0.28 2011 47.05 40.28 37.04 24.38 46.76 49.51 47.12 44.05 39.16 36.51 35.10 30.07 26.32 20.93 15.68 15.45 10.43 2012 45.87 35.15 25.41 14.49 39.01 45.82 43.12 38.83 32.69 24.94 22.34 18.37 15.21 11.49 8.63 9.73 11.98 2013 27.78 20.55 13.33 6.92 18.63 24.58 25.74 24.25 19.05 13.07 10.79 8.73 6.91 4.76 3.13 4.86 7.56 2014 12.16 9.60 6.07 3.04 4.60 8.60 11.55 11.95 9.03 5.94 4.63 3.77 2.88 1.58 0.44 1.85 3.91 2015 3.92 3.52 2.39 1.18 1.64 1.63 4.19 4.81 3.33 2.33 1.81 1.47 1.07 0.21 0.70 0.09 1.20 2016 0.32 0.79 0.76 0.36 4.24 1.10 1.04 1.56 0.70 0.72 0.62 0.49 0.32 0.29 0.96 0.73 0.43 2017 0.79 1.02 0.74 0.33 4.13 0.67 1.56 1.89 0.83 0.70 0.63 0.48 0.31 0.17 0.57 0.69 0.54 2018 0.15 0.22 0.18 0.08 1.91 0.64 0.19 0.45 0.18 0.17 0.16 0.12 0.07 0.07 0.17 0.21 0.13
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Dandan Zhi, Qichang Zhao, Zijun Wang, Jingjing Ma, Liguo Zhang, Sifeng Zhu, Aiming Zhou. Stability Analysis of Radiometric Properties in Visible On-Board Calibration System of FY-3B Satellite Medium-Resolution Spectral Imager[J]. Acta Optica Sinica, 2024, 44(12): 1228005
Paper Information
Category: Remote Sensing and Sensors
Received: Aug. 21, 2023
Accepted: Nov. 3, 2023
Published Online: Mar. 7, 2024
The Author Email: Zhi Dandan (1416652331@qq.com)
CSTR:32393.14.AOS231448
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