一种新型稀疏孔径结构的研究

提出了一种由九个孔径组成的稀疏孔径结构。给出了该孔径结构的光瞳函数,并分析了其孔径结构的特点。具体对不同填充因子时的新结构进行了仿真,得出了新型稀疏孔径结构的调制传递函数的分布特点,以及系统的等效直径和调制传递函数的变化情况。对新型稀疏孔径结构与三臂结构进行了比较和分析,新结构的传递函数分布比较均匀,对频域有较大的覆盖面积,系统的等效直径较大。新结构在等效直径和调制传递函数的均匀性方面优于所比较的三臂稀疏孔径结构,新结构在成像性能方面具有一定的优势。

Study of a New Sparse-aperture System

A new sparse aperture configuration composed by nine sub-apertures is proposed. The pupil function of the new configuration is given and the characteristic of its pupil function is analyzed. The simulation of the new configuration with different fill factors is done by computer. The characteristics of the modulation transfer function (MTF) the changes of the equivalent diameter and MTF are analyzed. The new configuration has a large and uniform coverage in the frequency field. By comparing the new configuration with the configuration of the Three Arms, the result shows that: the new configuration is better than the Three Arms in the equivalent diameter and the uniformity of the MTF. The new configuration has advantages in remote imaging.