基于数字编码的特征移相合成子孔径共相位边界效应研究

项目名称： 基于数字编码的特征移相合成子孔径共相位边界效应研究

项目编号： No.61475018

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 惠梅

作者单位： 北京理工大学

项目金额： 80万元

中文摘要： 多个子孔径合成成像起着增大光学系统的入瞳直径、提高系统分辨率的作用。与单块整镜主镜成像系统相比较，合成子孔径的关键技术是实现各子镜的共相位。为达到良好的成像效果，需要探测各子镜的相位并加以校准以实现子镜的共面排布。该研究是近年来合成子孔径成像系统领域的前沿课题和研究热点，在天文观测、航天遥感等领域，具有广阔的应用前景。本项目针对离轴抛物面合成子孔径共相位过程中难于解决的边界效应问题，深入研究其基本原理和方法，开展子孔径边界的识别与提取，力求突破边缘区域斜率采样的限制；基于特征移相方法提取子孔径边缘相位梯度陡峭处的相位值，从而获得子孔径的全孔径信息；利用离轴抛物面失调参考点获得非球面子孔径的边界相位校准系数；针对数字编码对边界相位提取的作用，研究多帧特征移相的相移算式；研究由于大相位梯度而引人的包裹相位问题，使相位解包裹根据特定需要而趋于合理；针对各项问题搭建测试平台，实现合成子孔径成像光学共相位的硬件分布。

中文关键词： 光学信息处理；光电检测；光学检测；图像识别；信号处理

英文摘要： Multiple sub-aperture synthetic imaging can enlarge pupil diameter of optical systems, and increase system resolution. To achieve good imaging quality, synthetic aperture imaging system requires phase cophase of each sub-aperture. Phase cophase of sub-aperture is a cutting-edge topic and research focus in the field of sub-aperture imaging system in recent years, which is prospectively widely applied in fields like astronomical observations and aerospace remote sensing. In the project, in-depth study about basic principles and methods of off-axis parabolic sub-aperture phase cophase was done. Fully summarize of relevant previous research was made to strive for further improvement and innovation. The study includes: Application of encoding features light phase shift method to extract the central dividing line to get sub-aperture wavefront information, and the use of sub-aperture offset reference point to get the aperture phase calibration coefficients of spherical surface. Exploration of sub-aperture edge identification and extraction, and striving breaks through the limit of slope sampling in marginal region. Study about influence of sinusoidal extreme strip phase shift on phase extraction, and based on sinusoidal stripe phase shift from multiple linear light sources of the illumination reflected image , to carry out the phase shift errors for inhibiting the phase shift error of extracted frame, Also will explore the wrapped phase problems due to the introduction of trigonometric cyclical, so that phase unwrapping method based on the specific needs of the more reasonable. We build experimental system for the study of problems and explore achieve sub-aperture imaging system hardware distribution.

英文关键词： Optical Information;Opto-Eletronics measurement;Optical Measurement;Image Recognition;Signal Processing