Analysis of an Co-phasing detecting method based on far-field images of sparse-optical-synthetic-aperture system
一种基于远场图像的稀疏光学合成孔径系统共相探测新方法的仿真研究

For the sparse-optical-synthetic-aperture telescope system,the co-phasing detection plays an important role for the realization of system’s high resolution in solving out piston errors between sub-apertures.In this paper,the relationship between piston error and system’s far-field intensity was analyzed based on physical principles,then the impact of piston error on system’s far-field images was clarified theoretically.Furthermore,an innovative co-phasing detecting method based on the far-field images’ similarity was approved for the bi-sub-aperture systems,with its feasibility,detecting deviation and dynamic range were researched by simulation.The results proved that,with this method,the piston error between the system’s two sub-apertures can be soundly detected principally while immune from the problems of 2πambiguity and direction decision that might exist within some other co-phasing detecting methods. Plus its dynamic range shown from these results,this new co-phasing detecting method provides effective references for deeper research of co-phasing detecting techniques.