论文部分内容阅读
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 performance of the three sub-aperture optical synthetic aperture imaging systems with three spatial arrangements was analyzed. According to the principle of avoiding the loss of effective frequency information, the spatial arrangement constraints corresponding to the three structures are respectively calculated, and the effective frequency coverage and equivalent aperture of the three structures are obtained. The results show that when the frequency coverage is relatively high, only the three-arm structure can be selected. When the ring-shaped uniform structure and the three-arm structure have the same effective frequency coverage, the three-arm structure is superior to the selection criterion of suppressing the second peak When the ring optimized structure and the three-arm structure have the same effective frequency coverage, the secondary peak of the point-spread function of the ring-shaped optimized structure is obviously larger than that of the three-arm structure, and the optical transfer function of the ring-optimized structure lacks the three-arm structure Symmetry characteristics.