星载多角度偏振成像仪测量精度验证与偏差分析
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摘要
为了检验星载多角度偏振成像仪(DPC)在自然目标下的偏振和辐射定标精度,设计了测量精度验证试验。在晴朗天气对天空成像,得到了天空的偏振度和辐亮度数据,并将其与同时观测的CE318型太阳-天空偏振辐射计的数据进行了比对。结果显示:三个偏振波段的平均偏振度差异小于0.02,满足DPC偏振测量精度的指标要求,但辐亮度差异较大。修正定标光源与测量目标间光谱非匹配的影响,两台仪器观测波段、观测视场非一致性的影响以及系统偏差后,两台仪器490nm和670nm通道的平均辐亮度的差异小于1%,865nm通道的平均辐亮度差异小于2%,验证了DPC定标数据的有效性和仪器的测量精度。
In order to verify the polarization and radiation calibration precision of the directional polarization camera(DPC)under natural targets,a verification experiment of measurement precision is designed.The data of the degree of polarization and radiation luminance for sky are obtained by imaging the sky in a clear weather and these data are compared with the simultaneous observation data by the CE318 sun-sky radiometer.The results show that,the average difference of the degree of polarization for the three polarization bands is smaller than 0.02,which meets the requirements of the polarization measurement precision of DPC,but the radiation luminance difference is big.After the correction of system deviation,the effect of the spectral non-matching between the calibration light source and target,and the effect of the inconsistency of the observation waveband and the observation visual field of two instruments,the average difference of radiation luminance for 490 nm and 670 nm channels of two instruments is less than 1%,and for the 865 nm channel is less than 2%,which verifies the validity of calibration data of DPC and the measurement precision of instruments.
In order to verify the polarization and radiation calibration precision of the directional polarization camera(DPC)under natural targets,a verification experiment of measurement precision is designed.The data of the degree of polarization and radiation luminance for sky are obtained by imaging the sky in a clear weather and these data are compared with the simultaneous observation data by the CE318 sun-sky radiometer.The results show that,the average difference of the degree of polarization for the three polarization bands is smaller than 0.02,which meets the requirements of the polarization measurement precision of DPC,but the radiation luminance difference is big.After the correction of system deviation,the effect of the spectral non-matching between the calibration light source and target,and the effect of the inconsistency of the observation waveband and the observation visual field of two instruments,the average difference of radiation luminance for 490 nm and 670 nm channels of two instruments is less than 1%,and for the 865 nm channel is less than 2%,which verifies the validity of calibration data of DPC and the measurement precision of instruments.
引文
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[19]Chen F,Zheng X B.Influence of spectrum notmatching on calibration precision of remote sensor[J].Optics and Precision Engineering,2008,16(3):415-419.陈风,郑小兵.光谱非匹配对光学遥感器定标精度的影响[J].光学精密工程,2008,16(3):415-419.
[2]Yang W F,Hong J,Qiao Y L.Optical design of spaceborne directional polarization camera[J].Acta Optica Sinica,2015,35(8):0822005.杨伟锋,洪津,乔延利.星载多角度偏振成像仪光学系统设计[J].光学学报,2015,35(8):0822005.
[3]Sun Y Z,Jiang G W,Li Y D,et al.Hyper-spectral observation satellite and its application prospects[J].Aerospace Shanghai,2017,34(3):1-13.孙允珠,蒋光伟,李云端,等.高光谱观测卫星及应用前景[J].上海航天,2017,34(3):1-13.
[4]Gu X F,Chen X F,Cheng T H,et al.In-flight polarization calibration methods of directional polarized remote sensing camera DPC[J].Acta Physica Sinica,2011,60(7):070702.顾行发,陈兴峰,程天海,等.多角度偏振遥感相机DPC在轨偏振定标[J].物理学报,2011,60(7):070702.
[5]Kang Q,Li J J,Chen L G,et al.Test and uncertainty analysis of reference source with variable polarization degree and large dynamic range[J].Acta Optica Sinica,2015,35(4):0412003.康晴,李健军,陈立刚,等.大动态范围可调线性偏振度参考光源检测与不确定度分析[J].光学学报,2015,35(4):0412003.
[6]Qian H H.Laboratory full field of view polarization calibration of directional polarimetric camera[D].Hefei:University of Science and Technology of China,2017:77-83.钱鸿鹄.宽视场航空偏振成像仪的实验室定标研究[D].合肥:中国科学技术大学,2017:77-83.
[7]Dubovik O,Smirnov A,Holben B N,et al.Accuracy assessments of aerosol optical properties retrieved from aerosol robotic network(AERONET)sun and sky radiance measurements[J].Journal of Geophysical Research,2000,105(D8):9791-9806.
[8]Oleg D,Michael D K.A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements[J].Journal of Geophysical Research,2000,105(D16):20673-20696.
[9]Holben B N,Eck T F,Slutsker I,et al.AERONET-A federated instrument network and data archive for aerosol characterization[J].Remote Sensing of Environment,1998,66(1):1-16.
[10]Li Z Q,Li D H,Li K T,et al.Sun-sky radiometer observation network with the extension of multiwavelength polarization measurements[J].Journal of Remote Sensing,2015,19(3):495-519.李正强,李东辉,李凯涛,等.扩展多波长偏振测量的太阳-天空辐射计观测网[J].遥感学报,2015,19(3):495-519.
[11]Torres B,Dubovik O,Toledano1 C,et al.Sensitivity of aerosol retrieval to geometrical configuration of ground-based sun/sky radiometer observations[J].Atmospheric Chemistry and Physics,2014,14(13):847-875.
[12]Li Z Q,Philippe G,Luc B,et al.Method to intercalibrate sunphotometer constants using an integrating sphere as a light source in the laboratory[J].Applied Optics,2015,52(11):2226-2234.
[13]Li K T,Li Z Q,Li D H,et al.Transfer method to calibrate the normalized radiance for a CE318Sun/sky radiometer[J].Chinese Optics Letters,2015,13(4):041001.
[14]Schmid B,Wehrli C.Comparison of sunphotometer calibration by use of the Langley technique and the standard lamp[J].Applied Optics,1995,34(21):4500-4512.
[15]Qian H H,Ye Q H,Meng B H,et al.The polarized radiometric theoretical error of spaceborne directional polarimetric camera[J].Spectroscopy and Spectral Analysis,2017,37(4):1558-1565.钱鸿鹄,叶擎昊,孟炳寰,等.星载多角度偏振成像仪偏振辐射测量的理论误差分析[J].光谱学与光谱分析,2017,37(4):1558-1565.
[16]Keith P,Deeph C,David F,et al.Restoration and frequency analysis of smeared CCD images[J].Applied Optics,1999,38(8):1343-1347.
[17]Zhang M M,Meng B H,Qian H H,et al.Research on correction method of stray light in directional polarimetric camera[J].Acta Optica Sinica,2017,37(11):1112003.张苗苗,孟炳寰,钱鸿鹄,等.多角度偏振成像仪杂散光校正方法研究[J].光学学报,2017,37(11):1112003.
[18]Lesser M P.Improving CCD quantum efficiency[J].Proceedings of SPIE,1994,2198:782-793.
[19]Chen F,Zheng X B.Influence of spectrum notmatching on calibration precision of remote sensor[J].Optics and Precision Engineering,2008,16(3):415-419.陈风,郑小兵.光谱非匹配对光学遥感器定标精度的影响[J].光学精密工程,2008,16(3):415-419.
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