Abstract: 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.

Key words: focusing plane array imagery, microscanning, sampling-averaging MTF, aliasing, fill factor