光学稀疏孔径系统的成像及其评价方法

对典型阵列结构的光学稀疏孔径系统成像特性进行了数值仿真分析,并采用基于光学实验测量的调制传递函数（MTF）完成了光学稀疏孔径系统成像实验的图像复原处理.针对复杂目标成像,为了评价光学稀疏孔径系统最终成像的整体质量,不仅考虑系统的调制传递函数指标,还提出了一种基于相关系数的成像质量客观评价方法.数值仿真结果和光学实验结果均表明,基于相关系数的成像质量客观评价方法是可行的,实验说明光学稀疏孔径系统成像质量可以达到其等效单个大孔径成像系统的成像效果.

Imaging of Optical Sparse Aperture Systems and Evaluate Method

Optical sparse aperture systems can be designed to obtain high resolution in astronomical object imaging.It is a particular array synthesized by several small filled imaging systems.The computer simulations are achieved for the three typical configurations imaging character of sparse apertures array.The analysis is presented on the modulation transfer function(MTF) and the resulted images on the optical experiments.Image restoration of the direct output by the sparse aperture system is performed by using the Weiner filter.To evaluate the whole quality of optical sparse aperture systems for the complicated target,except with the MTF,the correlation coefficient is also presented as a new objective estimate method of image quality.The results show that the Tri-Arm array configuration can produce the higher resolution and the larger correlation coefficient after the restoration.Accordingly,not only from theoretical analysis but also based on the experimental data,the possibility is demonstrated that the correlation coefficient is considered as the objective estimate method of image quality,and the optical sparse aperture systems can achieve almost the same resolution and image quality as an equivalent filled system.