基于宽动态目标的高分辨率光学卫星相机在轨辐射定标 
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On-Orbit Radiometric Calibration of High-Resolution Optical Satellite Camera Based on Wide Dynamic Targets
1 中国科学院安徽光学精密机械研究所, 安徽 合肥 230031
2 中国科学院通用光学定标与表征技术重点实验室, 安徽 合肥 230031
图 & 表
图 1. 太阳、大气、地表间辐射传输示意图
Fig. 1. Schematic of radiative transfer for sun, atmospheric and the earth's surfaces
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图 2. 宽动态目标及遥感影像
Fig. 2. Wide dynamic targets and remote sensing image
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图 3. 地面测试数据。(a)目标反射率;(b)大气参数
Fig. 3. Field measurement data. (a) Targets' reflectance; (b) atmospheric parameters
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图 4. 传感器响应值与目标反射率关系图
Fig. 4. Relationship of sensor's response and target reflectance
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图 5. 定标系数
Fig. 5. Calibration coefficient
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表 1典型地物反演结果
Table1. Results of typical ground object inversion
| Ground object | Parameter | FWD | NAD | BWD | B1 | B2 | B3 | B4 |
|---|
| | Measured | 0.2079 | 0.2069 | 0.2086 | 0.1654 | 0.1735 | 0.1990 | 0.2665 | | Reflectance | Retrieved | 0.2013 | 0.1968 | 0.2002 | 0.1587 | 0.1654 | 0.1922 | 0.2538 | | Grass | | Relative error /% | -3.21 | -4.87 | -4.02 | -4.05 | -4.67 | -3.38 | -4.76 | | | Measured | 50.2786 | 50.3231 | 50.2757 | 49.1925 | 50.6237 | 51.7993 | 50.1139 | | Radiance /(W·m-2·sr-1·μm-1) | Retrieved | 49.5690 | 48.7778 | 49.1658 | 47.2256 | 48.2832 | 50.5055 | 48.1519 | | | Relative error /% | -1.41 | -3.07 | -2.21 | -4.00 | -4.62 | -2.50 | -3.92 | | | Measured | 0.1792 | 0.1785 | 0.1795 | 0.1428 | 0.1595 | 0.1783 | 0.2037 | | Reflectance | Retrieved | 0.1783 | 0.1739 | 0.1722 | 0.1387 | 0.1506 | 0.1712 | 0.1951 | | Cobbled road | | Relative error /% | -0.53 | -2.56 | -4.06 | -2.84 | -5.55 | -4.01 | -4.22 | | | Measured | 43.7215 | 43.8044 | 43.6506 | 42.4645 | 46.5339 | 46.6222 | 38.4315 | | Radiance /(W·m-2·sr-1·μm-1) | Retrieved | 43.9039 | 43.1117 | 42.2839 | 41.2803 | 43.9670 | 44.9720 | 37.0112 | | | Relative error /% | 0.42 | -1.58 | -3.13 | -2.79 | -5.52 | -3.54 | -3.70 |
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表 2定标系数比较
Table2. Comparison of calibration coefficient
| Sensor band | FWD | NAD | BWD | B1 | B2 | B3 | B4 |
|---|
| Calibration coefficient obtained with our method /(W·m-2·sr-1·μm-1) | 4.5961 | 4.6710 | 4.8068 | 4.1284 | 4.2275 | 5.2825 | 5.1020 | | Calibration coefficient by test site /(W·m-2·sr-1·μm-1) | 4.4444 | 4.4425 | 4.9456 | 3.9604 | 4.4385 | 5.5835 | 5.1493 | | Relative error /% | 3.41 | 5.14 | -2.81 | 4.24 | -4.75 | -5.39 | -0.92 |
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表 3不确定度分析
Table3. Uncertainty analysis
| Uncertainty sources | Uncertainty contribution /% |
|---|
| Solar irradiance | 1.0 | | Reflectance of wide dynamic targets | Diffuser panel calibration | 2.0 | | Sky diffuse correction | 1.0 | | Atmospheric | Optical depth | 1.0 | | Transmittance | 1.0 | | Diffuse-to-global ratio | 2.0 | | Site measurement error | 0.5 | | Geometrical factor and others | 0.5 | | Total uncertainty | 3.6 |
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徐伟伟, 张黎明, 李鑫, 杨宝云. 基于宽动态目标的高分辨率光学卫星相机在轨辐射定标[J]. 光学学报, 2019, 39(10): 1028004. Weiwei Xu, Liming Zhang, Xin Li, Baoyun Yang. On-Orbit Radiometric Calibration of High-Resolution Optical Satellite Camera Based on Wide Dynamic Targets[J]. Acta Optica Sinica, 2019, 39(10): 1028004.
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