基于微扫描的焦平面阵列成像特性研究

Research on the FPA imaging character based on microscanning

在分析微扫描成像原理的基础上,利用固有奈奎斯特频率处的采样平均传递函数作为度量因子,定量表征了不同微扫描模式对焦平面成像系统成像质量的改进程度,得出微扫描模式与探测器占空比的最优对应关系;以一幅768×768的辐条图像作为原始目标,针对100%,50%两种占空比的探测器,采用像素处理方法,仿真了不同微扫描模式的成像过程,结果证明微扫描成像仿真效果与理论分析的一致性.

Based on the analysis of the microscanning imaging principle, sampling-averaging MTF at the inherent Nyquist frequency is used as a figure of merit to characterize quantitatively the improvement on the FPA imaging quality of typical microscanning modes, and the optimum corresponding relationship between the microscanning modes and detector fill factor is obtained. Then, taking a spoke image with 768 × 768 pixels as the original input, imaging processes with different microscanning modes are simulated with the pixel processing method for detectors with a fill factor of 100% and 50% respectively. Simulation results show a good agreement with those by theoretical analysis.