空间调制型全偏振成像系统解调算法优化  

Optimization with Demodulation Algorithm for Spatially Modulated Full Polarization Imaging System

作　　者：王孙晨 张磊 薛模根 吴云智 贾镕 薛莹 WANG Sun-chen;ZHANG Lei;XUE Mo-gen;WU Yun-zhi;JIA Rong;XUE Ying(Department of Information Engineering,Chinese Academy of People's Liberation Army Artillery Air Defense Academy,Hefei 230031,China;Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei 230027,China;Key Laboratory of Polarized Light Imaging Detection Technology in Anhui Province,Hefei 230031,China)

机构地区：[1]中国人民解放军陆军炮兵防空兵学院信息工程系,合肥230031 [2]中国科学技术大学精密机械与精密仪器系,合肥230027 [3]偏振光成像探测技术安徽省重点实验室,合肥230031

出　　处：《光子学报》2020年第12期146-156,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41871229)。

摘　　要：针对空间调制型全偏振成像系统中二维傅里叶变换解调算法的优化问题,提出贝塞尔修正的方向选择性二维汉宁切趾优化解调算法,对比分析了不同切趾函数主瓣宽度与旁瓣衰减的特性.相比于传统汉宁窗,该算法旁瓣抑制能力提高了12.89 dB,主瓣宽度为0.065π,同时在频谱滤波过程中对相对位置在对角线方向上频谱信息有良好抑制作用.搭建了基于琼斯矩阵的全偏振成像探测系统,并通过实验进行验证.实验结果表明:经过优化的解调算法全偏振分量的解调精度平均提高了9.48%,验证了优化解调算法的准确性和有效性.In order to optimize the two-dimensional Fourier transform demodulation in spatially modulated full polarization imaging system,Bessel's correction directional selective two-dimensional Hanning apodization optimal demodulation algorithm is proposed.The characteristics of main lobe width and sidelobe attenuation of different apodization functions are compared and analyzed.Compared with the traditional Hanning window,the proposed algorithm has a sidelobe suppression capability improved by 12.89 dB and a main lobe width of 0.065π.At the same time,it shows a good suppression effect on the diagonal spectrum information of the relative position in the spectrum filtering process.A system imaging simulation platform based on Jones matrix is built and verified by experiments.The experimental results show that the full polarization component demodulation accuracy of the optimized demodulation algorithm is improved by 9.48%on average,which verifies the accuracy and effectiveness of the optimized demodulation algorithm.

关 键 词：全偏振成像 空间调制 干涉图 傅里叶变换 琼斯矩阵 频域滤波 切趾 

分 类 号：O436.3[机械工程—光学工程]