摘要
光学合成孔径是实现高角分辨率成像的一种可行的方法。由于存在多个孔径,振动所产生的孔径面共相误差会影响成像质量。基于现有光学合成孔径成像原理,通过对平移误差和倾斜误差进行耦合建模,设计了一套光学合成孔径结构下的振动对点扩展函数(PSF)的影响模型。提出时间累积斯特列尔比(TISR),相较于传统评价指标,TISR用于分析在时间累积效应下耦合共相误差对PSF的影响。分析结果表明:在振动的持续作用下,PSF成像性能会大幅衰退,时间累积效应下的TISR曲线呈现出明显的周期性波动,最终随着时间的推移而逐渐收敛。
Optical synthetic aperture is a feasible method for high angular resolution imaging.Due to the existence of multiple apertures,the cophasing error of the aperture surface caused by vibration reduces imaging quality.Based on the existing imaging principle of optical synthetic apertures,a model for the effect of vibration on the point spread function(PSF)is designed by using an optical synthetic aperture structure,which couples the piston error and tilt error.The timeintegrated Strehl ratio(TISR)is proposed,and compared with the traditional evaluation index,TISR can be used to analyze the influence of the coupling cophasing error on PSF under the timeintegrated effect.The results reveal that the PSF imaging performance declines significantly under the continuous effect of vibration,and the TISR curve shows obvious cyclical fluctuations under the timeintegrated effect,which eventually converges over time.
作者
赵佳晨
张越
金科
Zhao Jiachen;Zhang Yue;Jin Ke(School of Aerospace Science and Technology,Xidian University,Xi′an 710126,Shaanxi,China;Shaanxi Key Laboratory of Space Extreme Detection,Xi′an 710071,Shaanxi,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2022年第22期32-40,共9页
Acta Optica Sinica
基金
国家自然科学基金(11872286,12072246)。
关键词
成像系统
光学合成孔径
点扩展函数
振动
斯特列尔比
imaging systems
optical synthetic aperture
point spread function
vibration
Strehl ratio
