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中国遥感卫星辐射校正场敦煌戈壁场区光环境变化研究

李元 张勇 胡丽琴 陆其峰 卢乃锰

李元, 张勇, 胡丽琴, 陆其峰, 卢乃锰. 中国遥感卫星辐射校正场敦煌戈壁场区光环境变化研究[J]. 中国光学. doi: 10.37188/CO.2020-0129
引用本文: 李元, 张勇, 胡丽琴, 陆其峰, 卢乃锰. 中国遥感卫星辐射校正场敦煌戈壁场区光环境变化研究[J]. 中国光学. doi: 10.37188/CO.2020-0129
LI Yuan, ZHANG Yong, HU Li-qin, LU Qi-feng, LU Nai-meng. Investigations of optical environment changes in the dunhuang gobi site of the chinese radiometric calibration sites[J]. Chinese Optics. doi: 10.37188/CO.2020-0129
Citation: LI Yuan, ZHANG Yong, HU Li-qin, LU Qi-feng, LU Nai-meng. Investigations of optical environment changes in the dunhuang gobi site of the chinese radiometric calibration sites[J]. Chinese Optics. doi: 10.37188/CO.2020-0129

中国遥感卫星辐射校正场敦煌戈壁场区光环境变化研究

doi: 10.37188/CO.2020-0129
基金项目: 国家重点研发计划课题(No. 2018YFB0504601);国家自然基金委员会面上项目(No. 41271373);民用航天“十三五”技术预先研究项目(No. D040401)
详细信息
    作者简介:

    李元:李 元(1978—),女,北京丰台人,工学博士,国家卫星气象中心副研究员,主要从事在轨遥感器定标与产品反演等方面的研究。E-mail:liyuan@cma.gov.cn

    张勇:张 勇(1977—),男,陕西镇巴人,理学博士,国家卫星气象中心研究员,主要从事卫星遥感器辐射定标与真实性检验方面的研究。E-mail:zhangyong@cma.gov.cn

  • 中图分类号: O432.1; P422.1

Investigations of optical environment changes in the dunhuang gobi site of the chinese radiometric calibration sites

Funds: National Key Research and Development Project (No. 2018YFB0504601); National Natural Science Foundation of China General Project (No. 41271373); Civil Aerospace “Thirteenth Five-Year” Technology Pre-research Project (No. D040401)
More Information
  • 摘要: 中国遥感卫星辐射校正场敦煌戈壁场区在国内外遥感卫星在轨辐射定标与定量化应用领域具有不可替代的作用。随着2016年敦煌场区外围南侧熔盐塔式光热发电项目的建成并投入使用,集热塔散射辐射对场区光环境的影响程度有待开展详细的分析评估。本文开发了使用Monte Carlo三维辐射传输模型模拟与CE318多通道光度计等高线实测分析相结合的定量分析方法,解决了散射辐射交融于背景辐射中难以定量评估的问题。通过使用新型的ASC200云量自动观测仪,提高了晴空判识精度。通过开发CE318四象限定位修正算法,有效提高了观测数据质量。2020年1−3月收集到的有效数据显示除了550 nm通道,集热塔未对天空漫射辐射带来明显影响。对于500 nm通道,在有效数据对应的观测几何下(距离0.87−3.07 km,观测天顶角77.30−51.32°),集热塔吸热器对天空漫射辐射的影响不超过0.93%。与模型模拟的结果结合起来分析后,可以得出当距离电站2公里时大电站散射辐射带来的天空漫射辐射相对变化<1.62%,大于等于3公里时相对变化<0.93%的结论。本项研究成果对利用敦煌场开展遥感定量化应用,准确评估发电站引进的不确定度因素具有积极意义。
  • 图  1  在自动观测基地附近观察到的工作状态的集热塔

    Figure  1.  Heat collection tower in working condition observed from the automatic observation base

    图  2  等高线测量角度示意图

    Figure  2.  Schematic diagram of the almucantar measurement angle

    图  3  卫星观测到的集热塔反射光的辐射能量水平分布示例

    Figure  3.  An example of the radiant energy level distribution of the light reflected by the heat collection tower observed by the satellite

    图  4  2020年3月2日UTC 7:00:05时刻ASC200云量自动观测仪红外云图

    Figure  4.  ASC200 cloud cover automatic observer infrared cloud image at 7:00:05 UTC on March 2, 2020

    图  5  归一化的全天空漫射辐射光谱与CE318不同通道光谱响应函数

    Figure  5.  Normalized full sky diffuse irradiance and CE318 spectral response function

    图  6  440 nm相对偏差RdevBr最小值−2.07%(03−09 09:59)

    Figure  6.  Relative deviation RdevBr of 440 nm, whose minimum value is −2.07% (03−09 09:59)

    图  7  500 nm相对偏差RdevBr最小值−3.65%(03−03 08:03)

    Figure  7.  Relative deviation RdevBr of 500 nm minimum −3.65% (03−03 08:03)

    图  8  500 nm相对偏差RdevBr最大值0.93%(01−25 09:04)

    Figure  8.  Relative deviation RdevBr of 500 nm, whose maximum value is 0.93%(01−25 09:04)

    表  1  模拟的相关参数定义

    Table  1.   Definitions of parameters in the simulation

    相关参数取值范围
    模拟区域范围11 km*11 km
    (设定集热塔位于模拟区域中心像元的中央)
    水平空间分辨率1 km
    反射光源性质离地面高度260米;向上各角度随机发射
    计算波段0.55微米
    大气背景中纬夏季大气考虑H2O、O2、O3气体吸收和
    大气分子瑞利散射
    气溶胶特性光学厚度0.1;单次散射反照率0.938;
    不对称因子0.764
    地表特性地表反照率0.2
    下载: 导出CSV

    表  2  CE318通道设置

    Table  2.   CE318 channel specifications

    编号中心波长带宽观测模式
    11020 nm10 nmS、A、K
    21640 nm25 nmS、A、K
    3870 nm10 nmS、A、K
    4675 nm10 nmS、A、K
    5440 nm10 nmS、A、K
    6500 nm10 nmS、A、K
    71020i nm10 nmS
    8936 nm10 nmS
    9380 nm2 nmS
    10340 nm2 nmS
    下载: 导出CSV

    表  3  CE318性能参数

    Table  3.   CE318 performance parameters

    项目内容
    视场1.2°
    探测器铟镓砷(InGasn)探测器:1020i nm,1640 nm硅探测器:其它
    工作温度−30至+ 60 °C
    太阳追踪方法四象限探测器主动跟踪
    跟踪精度优于0.1°
    天空漫射辐射
    观测频率
    固定时刻与大气质量数
    动态范围增益可调
    量化等级15
    下载: 导出CSV

    表  4  ASC200性能参数

    Table  4.   ASC200 performance parameters

    项目内容
    观测指标可见光云量、红外云量、综合云量
    红外波长8−14微米
    视场角可见光180°,红外160°
    采样周期10分钟
    工作温度−45 °C至55 °C
    下载: 导出CSV

    表  5  HIM性能参数

    Table  5.   HIM performance parameters

    项目内容
    观察内容总天空辐照度,天空漫射辐照度,漫射/总漫射比
    波长400−2400 nm
    半高宽4 nm @ 400−950 nm,15 nm @ 950−1700 nm,
    20 nm @ 1700−2400 nm
    采样期6分钟
    工作温度−30 °C至60 °C
    信噪比≥600@ 400−1000 nm,≥300@ 1000−1700 nm,
    ≥200@ 1700−2400 nm(M = 2,非吸收通道)
    下载: 导出CSV

    表  6  观测数据的质量控制阈值

    Table  6.   Observation data quality control threshold

    项目数值
    云量0
    光学厚度<0.2
    ALL与ALR相对偏差的标准差<1%
    相对偏差计算点与大小电站的投影距离>5 km
    太阳与大小电站的投影距离>2.5 km
    ALL与ALR观测时间差异<1 min
    下载: 导出CSV

    表  7  卫星观测到的集热塔反射光的辐射能量相对分布情况

    Table  7.   The relative distribution of the radiant energy of the light reflected by the heat collection tower observed by the satellite

    距离0度10度20度30度40度50度
    0 km1.0000.7800.5490.3810.2770.202
    1 km0.4340.3690.2850.1940.1790.162
    2 km0.0350.0330.0330.0320.0370.047
    3 km0.0200.0190.0200.0210.0230.027
    4 km0.0160.0160.0160.0170.0200.023
    5 km0.0150.0150.0150.0160.0180.021
    下载: 导出CSV

    表  8  各级筛选后有效观测数据量值统计(组)

    Table  8.   Statistics of effective observation data after being selected at different levels (group)

    筛选项目1020 nm1640 nm870 nm576 nm440 nm500 nm合计
    a)8047786114667875654011
    b)135132815413570607
    c)457747444344300
    d)0316272259
    e)0212221643
    f)020114926
    g)020114926
    h)020114926
    下载: 导出CSV

    表  9  吸热器散射辐射带来的相对偏差(440 nm)

    Table  9.   Relative deviation due to scattered radiation from the heat absorber (440 nm)

    UTC TimeAODSz (°)Sa (°)Beta (°)HB (km)onDegB (°)DdegB (°)RdevB (%)RdevBr (%)HS (km)onDegS (°)DdegS (°)RdevS (%)RdevSr (%)
    03-10 08:590.1561.83235.340.072.06185.374.63−1.18−1.081.540124.874.87−0.29−0.31
    03-10 07:590.1453.28220.750.112.86170.770.77−1.14−0.922.140110.279.73−1.57−1.49
    03-10 06:590.1547.20202.900.133.55152.922.92−0.04 0.312.65092.422.42−1.37−1.18
    03-09 10:270.1777.14252.070.090.881102.092.09−0.70−0.720.660141.591.59 0.24 0.14
    03-09 09:590.1572.12247.040.121.24197.062.94−2.11−2.070.930136.563.44−0.63−0.74
    03-02 09:020.1564.41233.460.061.84183.483.48−0.51−0.421.381122.982.98−1.23−1.24
    03-02 07:020.1850.22202.090.133.19152.122.12−0.20 0.192.390 91.621.62−1.47−1.28
    02-27 10:140.1477.10246.640.090.88196.663.34−0.89−0.870.660136.163.84−0.75−0.84
    02-27 09:020.1665.23232.610.161.77182.632.63−1.47−1.231.330122.132.130.47 0.39
    02-27 08:020.1957.00218.410.092.49168.431.57 0.09 0.301.860107.937.93 1.33 1.38
    02-27 07:020.1851.24201.490.083.08151.511.51−0.51−0.292.300 91.021.02−0.61−0.50
    01-25 09:240.1676.61230.440.110.92180.460.46−0.18 0.000.690119.970.03−0.81−0.91
    01-25 09:030.1773.56226.290.061.13176.323.68−0.14−0.030.850115.824.18−0.60−0.64
    01-10 07:560.1968.63211.650.041.50061.671.67−1.02−0.891.121101.171.17−0.44−0.43
    下载: 导出CSV

    表  10  吸热器散射辐射带来的相对偏差(500 nm)

    Table  10.   Relative deviation due to scattered radiation from the heat absorber (500 nm)

    UTC TimeAODSz (°)Sa (°)Beta (°)HB (km)onDegB (°)DdegB (°)RdevB (%)RdevBr (%)HS (km)onDegS (°)DdegS (°)RdevS (%)RdevSr (%)
    03-10 09:000.1462.01235.590.122.04185.614.39−0.85−0.631.530125.115.11 0.88 0.87
    03-10 08:000.1453.42221.040.252.85171.061.06−0.74−0.142.130110.569.44−1.19−0.97
    03-03 08:030.1555.92219.770.142.60169.800.20−4.01−3.651.940109.309.30−1.21−1.10
    02-27 10:160.1477.30246.840.080.87196.863.14 0.29 0.320.650136.363.64−0.10−0.18
    02-27 07:030.1651.32201.840.143.07151.861.86−2.24−1.812.290 91.361.36−0.46−0.22
    01-25 09:250.1576.80230.690.170.90180.710.71 0.57 0.880.680120.210.21−0.09−0.21
    01-25 09:040.1673.72226.510.111.12176.543.46 0.68 0.930.840116.043.96−0.20−0.25
    01-10 08:580.1775.87224.520.080.97074.544.54 0.49 0.710.721114.045.96 0.31 0.28
    01-10 07:570.1768.75211.920.071.49061.94 1.94−0.50−0.251.121101.441.44−0.02 0.01
    下载: 导出CSV

    表  11  大电站散射辐射带来的天空漫射辐射相对变化随距离与观测角度变化(%)

    Table  11.   The relative change of the sky diffuse radiation caused by the scattered radiation from the large power station changes with distance and the observation angle (%)

    距离0度10度20度30度40度50度
    0 km34.4426.8718.9113.129.546.96
    1 km14.9512.719.826.686.175.58
    2 km1.211.141.141.101.271.62
    3 km0.690.650.690.720.790.93
    4 km0.550.550.550.590.690.79
    5 km0.520.520.520.550.620.72
    下载: 导出CSV
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