分布式孔径综合成像系统旋转和放大率误差的校正  

Correction of Rotation and Magnification Errors in Distributed Aperture Synthesis Imaging System

作　　者：陈波 孙天齐 刘爱新 杨旭 

机构地区：[1]华北理工大学电气工程学院,河北唐山063210 [2]北京铁路局机务处,北京100086

出　　处：《激光与光电子学进展》2018年第1期297-302,共6页Laser & Optoelectronics Progress

基　　金：河北省自然科学基金(F2013209149);华北理工大学研究生创新项目(2017S24)

摘　　要：针对基于数字全息术的分布式孔径综合成像系统,分析子孔径间探测器旋转和光瞳放大率误差对孔径综合成像的影响,提出基于子孔径目标图像配准的误差校正方法。首先采用尺度不变特征变换算法、欧氏距离最邻近法和M估计抽样一致算法进行子孔径目标图像配准,由此计算出子孔径间探测器旋转和光瞳放大率误差。其次对子孔径上的目标光复振幅进行处理,实现旋转和放大率误差的校正。实验结果表明,由子孔径目标图像配准计算出的旋转角度和放大率的相对误差小于0.01,校正后综合孔径成像锐度显著提高。In the distributed aperture synthesis imaging system based on digital holography, the errors of detector rotation and the pupil magnification among the sub-apertures are studied, and the correction methods based on the sub-aperture image registration is proposed. The scale-invariant feature transform algorithm, the nearest neighbor search method based on Euclidean distance and the M-estimator sample consensus algorithm are carried out to realize the image registration of sub-aperture, so that the errors of relative rotation angle and magnification among the sub- apertures are calculated. Then the complex amplitude of object light is processed to correct the rotation and magnification errors. The experimental results show that the calculated relative error values are less than 0. 01, and the sharpness value of synthetic aperture image is significantly improved after correction.

关 键 词：成像系统 分布式孔径 数字全息 旋转误差 放大率误差 校正 

分 类 号：O436[机械工程—光学工程]