对三种空间排布结构的四子孔径光学合成孔径成像系统性能进行了分析。根据避免有效频率信息丢失的原则,分别计算了三种结构各自对应的空间排布限制条件,在此基础上得到了三种结构的有效频率覆盖范围和等效孔径。结果表明,当频率覆盖范围要求比较高时,只能选择三臂结构;当环形均匀结构和三臂结构具有相同的有效频率覆盖范围时,按照抑制次峰的选择标准,三臂结构要优于环形均匀结构; 当环形优化结构和三臂结构具有相同的有效频率覆盖范围时,环形优化结构的点扩展函数次峰要明显大于三臂结构,而且环形优化结构的光学传递函数缺乏三臂结构的对称特性。

The performances of three kinds of spatial arrangement for the optical synthetic aperture imaging system with four sub-apertures are analyzed. Based on the criterion of avoiding the loss of the effective spatial-frequency information, the restrictive conditions of the spatial arrangement are calculated, and then the effective frequency coverage range and the equivalent aperture are obtained. The results shows that three-arm arrangement is adopted as long as the requirement of frequency coverage range is relatively high; when the frequency coverage range of the three-arm arrangement and the annular-uniform arrangement is equal, the former is better than the latter based on the criterion of the secondary peak depression. When the frequency coverage range of the three-arm arrangement and the annular-optimization arrangement is equal, the point spread function of the annular-optimization arrangement is larger than that of the three-arm arrangement, and the optical transfer function of the annular-optimization arrangement is lack of symmetry of three-arrangement.