摘要:
稀疏光学合成孔径系统中,共相探测环节检测子孔径间的相位平移误差,为系统高分辨力的实现提供重要支持.文章从基本的物理原理出发,分析了系统远场与相位平移误差的关系,并以此为基础,从数学上阐明了相位平移误差对系统远场图像的影响机制.进一步,针对典型的两孔径系统,提出了一种新的基于远场相似度的共相探测方法,并对其可行性、原理性偏差和动态范围进行了仿真分析.结果表明,该方法在原理上可实现对两孔径系统相位平移误差的良好标定,且避免了一些既有方法可能存在的2π模糊性及无法判断符号的问题,具有一定的动态范围,为共相探测新技术的进一步研究提供了有效参考.
Abstract:
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.
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