空间外差遥感数据光谱-干涉图双向校正算法研究  

Research on Spectral Interferogram Bidirectional Correction Method for Spatial Heterodyne Remote Sensing Data

作　　者：王新强[1,3] 王祯 梁秋裕 熊伟 李志伟[2,4] 叶松[1,3] 甘永莹[1,3] 王方原 WANG Xin-qiang;WANG Zhen;LIANG Qiu-yu;XIONG Wei;LI Zhi-wei;YE Song;GAN Yong-ying;WANG Fang-yuan(School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;Guangxi Key Laboratory of Optoelectronic Information Processing,Guilin 541004,China;Key Laboratory of General Optical Calibration and Characterization of Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]桂林电子科技大学光电工程学院,广西桂林541004 [2]中国科学院安徽光学精密机械研究所,安徽合肥230031 [3]广西光电信息处理重点实验室,广西桂林541004 [4]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

出　　处：《光谱学与光谱分析》2024年第4期963-968,共6页Spectroscopy and Spectral Analysis

基　　金：国家重点研发项目(2022YFB3901800);广西自然科学基金项目(桂科AD19245184);国家自然科学基金项目(41961050,41975033);中国科学院通用光学定标与表征技术重点实验室研究项目,广西光电信息处理重点实验室基金项目(GD18105,GD21105);桂林电子科技大学研究生教育创新计划项目(2022YCXS171)资助。

摘　　要：空间外差光谱技术(SHS)作为新型高光谱分析技术,被广泛应用于大气检测、卫星遥感等领域,但由于空间外差光谱仪的制作不理想或工作环境的变化都会改变仪器参数而引入误差,使干涉图数据不准确,需要进行误差校正。在卫星平台下,由于与地面环境的巨大差异,导致地面测定的校正参数对空间外差干涉图数据不再适用,特别是调制项误差(相位误差和非均匀误差)的改变,极大影响了光谱的准确性。针对空间外差遥感数据的调制项误差,从光谱与干涉图两个方面入手,进行误差分离与原因分析,认为空间外差遥感数据误差主要来源于CCD尺寸伸缩导致的光谱频率变化和CCD响应改变导致的干涉图强度变化,提出了光谱-干涉图双向校正方法。校正测试数据选取高分五号搭载检测仪(GMI)实测的12条O 2吸收光谱。取其中一条作为标定光谱,以SCIATRAN仿真的无误差光谱为基准,与标定光谱进行对比,分析两者在光谱维的频率偏差,通过特征峰频率确定两者的频率变换关系。然后根据变换关系将仿真光谱进行频率拉伸,使拉伸后的仿真光谱与实测光谱谱峰重合,计算拉伸仿真光谱与实测光谱干涉图,将两者干涉图相比得到干涉图强度的变化关系。最后将干涉图强度变化关系用于其余11条光谱的校正,得到校正后光谱。为了衡量校正效果,以校正前后光谱的标准差、均方误差和信噪比作为评价指标。结果显示标准差、均方误差都明显降低,同时信噪比显著增大,且标准差基本都在0.07以下,信噪比基本能达到20以上。其中校正效果最好的实测光谱,标准差减少了0.3767,信噪比提高了25.1016,均方误差降低了0.1587,校正效果较差的实测光谱,标准差减少了0.2296,信噪比提高了9.6328,均方误差降低了0.1049。因此所提出的光谱-干涉图双向校正方法对空间外差遥感数据的误差校正起到较好的效果,且Spatial Heterodyne Spectroscopy(SHS),a new hyperspectral analysis technology,has been widely used in atmospheric detection,satellite remote sensing and other fields.However,because the fabrication of spatial heterodyne spectroscopy is not ideal or the change of working environment will change the instrument parameters and introduce errors,the interferogram data is not accurate,so error correction is needed.Due to the huge difference between the satellite platform and the ground environment,the correction parameters measured on the ground are no longer applicable to the spatial heterodyne interferogram data,especially the change of modulation errors(phase errors and non-uniform errors),which greatly affects the accuracy of the spectrum.Based on spatial heterodyne modulation of the remote sensing data error,from two aspects of spectrum and the interference figure,separation and analysis of the causes of error,think mainly comes from the CCD size scale spatial heterodyne remote sensing data error caused by spectral frequency change and the CCD response to a change in intensity of interference pattern change,spectral interferogram bidirectional correction method is proposed.Twelve O 2 absorption spectra measured by the Greenhouse Gases Monitoring Instrument(GMI)on GF-5 were selected for calibration.Onewas taken as the calibration spectrum,and the error-free spectrum simulated by SCIATRAN was compared with the calibration spectrum.The frequency deviation of the two spectra in the spectral dimension was analyzed,and the frequency of the characteristic peak determined the frequency transformation relationship between the two.Then,the simulated spectrum is stretched in frequency according to the transformation relationship so that the simulated spectrum after stretching coincides with the measured spectrum peak.The interferogram of the stretching simulation spectrum and the measured spectrum is calculated,and the changing relationship of the interferogram intensity is obtained by comparing the interferogram of the two.Fi

关 键 词：空间外差遥感 误差校正 光谱谱峰频率 干涉图强度幅值 

分 类 号：O433.4[机械工程—光学工程]