Method of in-flight wavelength calibration for wide band hyper-spectral imager
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摘要: 高光谱成像探测仪在轨波长漂移和性能衰变是有效载荷在轨长期工作必须解决的问题。利用太阳辐射光谱和大气后向散射辐射光谱中特有的Fraunhofer吸收线可作为星上波长定标的基准。针对波长定标精度需求，优选出高精度的太阳参考光谱，用仪器狭缝函数卷积后初选出87条Fraunhofer吸收线，并分析了由Fraunhofer吸收线分布非均匀性引起的系统误差，以及由仪器探测能力不同而产生的随机误差。综合最大偏差和RMS，确定了在满足定标精度优于0.01 nm的条件下，可用的76条太阳Fraunhofer线的精确位置。该研究为高光谱成像探测载荷在轨高精度波长定标奠定了基础。
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关键词:
- 波长漂移 /
- 波长定标 /
- 太阳参考光谱 /
- 太阳Fraunhofer线 /
- 高光谱成像
Abstract: The wavelength drift and performance decay of hyper-spectral imager are the main problems that must be solved for long-term operation in orbit. The Fraunhofer absorption line, which is unique in the solar radiation spectrum and the atmospheric backscattering radiation spectrum, can be used as the benchmark for the wavelength calibration. According to the requirement for wavelength calibration precision of instrument, the high precision solar reference spectrum was optimized, then 87 Fraunhofer absorption lines were selected by the convolution of instrument slit function. The system error caused by the line asymmetric and the random error caused by the instrument detection capabilities were analyzed.Based on maximum deviation and RMS, the exact positions for available 76 solar Fraunhofer lines were determined under the condition that the calibration accuracy was better than 0.01 nm. This study lays the foundation for high precision wavelength calibration of hyper-spectral imaging on- orbit. -
[1] Mao Jinghua, Wang Yongmei, Shi Entao, et al. Spectral calibration based on echelle[J]. Chinese Optics, 2017, 10(3):376-382. (in Chinese) [2] Dirksen R, Dobber M, Voors R, et al. Prelaunch characterization of the Ozone Monitoring Instrument transfer function in the spectral domain[J]. Applied Optics, 2006, 45(17):3972-3981. [3] Lin Chao, Li Chengliang, Wang Long, et al. Preflight spectral calibration of hyperspectral carbon dioxide spectrometer of TanSat[J]. Optics and Precision Engineering, 2017, 25(8):2064-2075. (in Chinese) [4] Xu Weiwei, Zhang Liming, Li Xin, et al. On-orbit absolute radiometric calibration of high resolution satellite optical sensor based on gray-scale targets[J]. Infrared and Laser Engineering, 2018, 47(4):0417005. (in Chinese) [5] Voors R, Dobber M, Dirksen R, et al. Calibration method to correct for cloud-induced wavelength shifts in Aura's Ozone Monitoring Instrument[J]. Applied Optics, 2006, 45(15):3652-3658. [6] Xian Guang, Yan Changxiang, Wu Congjun, et al. Effect of temperature on airborne imaging spectrometer optical properties[J]. Infrared and Laser Engineering, 2015, 44(5):1647-1653. (in Chinese) [7] Hilsenrah E, Cebula R P, Deland M T, et al. Global Ozone Monitoring Experiment (GOME) on board of ERS 2[J]. J Geophys Res, 1995, 100(5):1351-1366. [8] Dobber M R, Dirksen R J, Levelt P F, et al. Ozone monitoring instrument calibration[J]. IEEE Trans Geosc Rem Sens, 2006, 44(5):1209-1237. [9] Liu Q Q, Zheng Y Q. Development of spectral calibration technologies with ultra-high resolutions[J]. Chinese Optics, 2012, 5(6):566-577. (in Chinese) [10] Jos H G M van Geffen, Roeland F van Oss. Wavelength calibration of spectra measured by the Global Ozone Monitoring Instrument:variation along orbits and in time[J]. Applied Optics, 2004, 43(3):695-706. [11] Chance K, Spurr R J D. Ring effect studies:Rayleigh scattering, including molecular parameters for rotational Raman scattering, and the Fraunhofer spectrum[J]. Applied Optics, 1997, 36(21):5224-5230. [12] Heath D F, Georgiev G. A new approach for spectroradiometric calibration consistency on the ground and in space[C]//SPIE, 2012, 8528:85280R. [13] Chance K, Kurucz R L. An improved high-resolution solar reference spectrum for earth's atmosphere measurements in the ultraviolet, visible, and near infrared[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 2010, 111(9):1289-1295. [14] Thuillier G, Hers M, Labs D, et al. The solar spectral irradiance from 200 to 2400 nm as measured by the SOLSPEC spectrometer from the ALTAS and EURECA mission[J]. Solar Phys, 2003, 214(1):1-22. -
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