1 中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室, 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
GF-5卫星多角度偏振成像仪(DPC)同一波段三个偏振通道(0°、60°及120°)必须进行响应非一致性校正,才能达到偏振探测的精度要求。将范围为-50°~50°的DPC宽视场划分为15×15个分视场,使用高精度的二维转动平台调整各分视场的位置以对准积分球参考光源进行成像。设计基于时间稳定性的分视场图像数据的拼接算法,得到全视场的拼接图像,并应用对数增强方法检测拼接图像中坏像元的位置与数量。采用拼接图像计算DPC同一波段三偏振通道的相对透过率、低频相对透过率及高频相对透过率,为DPC偏振通道响应非一致性校正提供了校正系数。结果表明,DPC偏振通道的响应非一致性测量不确定度优于0.67%。所提方法为校正DPC偏振通道间的响应非一致性、提高偏振信息的解析精度提供了高精度的手段。
遥感 偏振通道 宽视场 响应非一致性 分视场 测量不确定度
Author Affiliations
Abstract
1 Institute of Fiber Optic Communication and Information Engineering, College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2 State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
A novel polarization channel drop filter (PCDF) based on two-dimensional (2D) photonic crystals (PCs) is presented. It consists of two line defect waveguides and two point defect micro-cavities. In the line-defect waveguides, the transverse-electric (TE) and transverse-magnetic (TM) polarization lights are guided using photonic band-gap and total internal reflection effect, respectively. The light at the resonant frequency for TE polarization can be transferred from one waveguide to the other using the proposed system. Compared with the existing four-port PCDF based on PCs, the three-port structure can realize a multi-channel wavelength system of PCDF more easily and can be an essential device in future polarization wavelength division multiplexing (PWDM) systems.
光子晶体 偏振通道下路滤波器 偏振波分复用系统 250.5300 Photonic integrated circuits 230.5750 Resonators 230.7370 Waveguides Chinese Optics Letters
2010, 8(8): 749
