论文部分内容阅读
由于在截止频率区域内稀疏孔径系统的调制传递函数(MTF)比全孔径系统的调制传递函数下降,甚至调制传递函数可能出现零点而影响成像质量,通过稀疏孔径系统的结构优化可以获得调制传递函数分布比较理想的孔径结构。给出了基于实际空间截止频率ρR和子孔径直径的稀疏孔径结构优化准则,对复合三子镜稀疏孔径结构进行优化,分析了优化前后的调制传递函数变化,并对优化结构的复合三子镜稀疏孔径系统模拟成像和维纳滤波,比较优化前和优化后稀疏孔径结构的成像情况。结果表明结构优化是稀疏孔径光学系统设计的一个关键部分,应用的优化准则对稀疏孔径结构优化是合理的,通过结构优化可以使复合三子镜稀疏孔径系统的成像质量得到改善。
Because the modulation transfer function (MTF) of the sparse aperture system is lower than that of the full aperture system in the cut-off frequency range and even the zero of the modulation transfer function may affect the imaging quality, the modulation transfer function can be obtained through structural optimization of the sparse aperture system Distribution of the ideal aperture structure. The optimization criterion of sparse aperture structure based on the actual cutoff frequency ρR and subaperture diameter is given. The sparse aperture structure of the compound three sub - mirror is optimized. The changes of the modulation transfer function before and after optimization are analyzed. Aperture system simulation imaging and Wiener filter to compare pre-optimization and optimization of sparse aperture structure imaging. The results show that the structural optimization is a key part of the design of sparse aperture optical system. The optimized criterion is reasonable to optimize the sparse aperture structure. The structural optimization can improve the imaging quality of the sparse aperture system.