干涉成像光谱复原典型窗函数特性对比  

Comparison of Typical Window Function Characteristics in Interferometric Imaging Spectroscopy Restoration

作　　者：扶杨玉 柳稼航 王伟刚[3] 栾吉 Fu Yangyu;Liu Jiahang;Wang Weigang;Luan Ji(College of Astronautics,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,Jiangsu,China;Key Laboratory of Space Photoelectric Detection and Sensing of Industry and Information Technology,Nanjing 211106,Jiangsu,China;Beijing Institute of Space Mechanics and Electricity,Beijing 100190,China)

机构地区：[1]南京航空航天大学航天学院,江苏南京211106 [2]空间光电探测与感知工信部重点实验室,江苏南京211106 [3]北京空间机电研究所,北京100190

出　　处：《光学学报》2024年第11期283-296,共14页Acta Optica Sinica

基　　金：国家科技重大专项;江苏省双创人才计划(JSSCR2021501);南京航空航天大学引进人才科研启动项目。

摘　　要：从窗函数的基本原理出发,首先以矩形窗的傅里叶变换为例,分析同步采样对光谱定标及采样规则设定的意义;然后,采用谱分析理论和实验仿真对6种典型窗函数的特性及其对复原光谱的影响进行量化比较分析。结果表明,H-G强切趾函数和可调节的切比雪夫切趾函数能有效抑制相邻谱线的干扰,而且其复原光谱具有更强的细节分辨能力。用模拟干涉数据和嫦娥一号IIM数据进行实验,进一步验证了这一结论。在此基础上,基于不同窗函数抗干扰或保细节的能力不同,提出一种多窗函数联合的加权融合复原方法,获得了更好的复原结果。Objective Interference imaging spectroscopy is a cutting-edge technology of visible and infrared remote sensing,which can obtain both spatial and spectral information of the earth element.The interferometric imaging spectrometer directly acquires the interferogram,which can be transformed to spectra by Fourier transform.However,the interferometer detector can only acquire a limited length interferogram,and the truncation of the real interferogram will cause sidelobe to appear in the restored spectrum,which results in false spectral information.In practical applications,apodization is employed to reduce sidelobe interference.As an important step of interference spectral restoration,apodization exerts a significant influence on the accuracy of the restored spectra.Meanwhile,there are few quantitative analyses on the performance of different types of window functions in the existing literature.Thus,we provide a detailed analysis of six typical window functions and propose a weighted fusion method for the joint restoration of multi-window functions based on their characteristics,providing references and guiding significance for the application of window functions.Methods Firstly,based on the basic digital signal processing principle,we emphasize the guiding significance of synchronous sampling in spectral calibration,the establishment of sampling rules for the detection of specific substances,and the necessity of apodization in cases of asynchronous sampling.By utilizing spectral analysis theory,the main lobe width and the height of the first sidelobe in the frequency domain of the window function are employed as metrics to assess the window function performance.Furthermore,an exploration is conducted to understand their specific influence on the restored spectrum.Subsequently,a quantitative comparison of the performance metrics for six typical window functions is carried out.Further validation is carried out using simulated interference data and CE-1 IIM data to demonstrate that H-G strong apodization and Chebyshev

关 键 词：光谱学 干涉成像光谱仪 切趾 窗函数 光谱复原 多窗函数融合 

分 类 号：TH744.1[机械工程—光学工程]