刃边法的MTF评价精度分析

Accuracy of knife-edge method in MTF assessment

通过开展仿真实验和理论分析,系统地研究大气、靶标倾角、靶标对比度和随机噪声、边缘探测精度和ERF拟合模型对调制传递函数(MTF)评价精度的影响,并对各种仿真参数下的MTF总体评价精度进行分析.分析结果对利用刃边法开展在轨MTF评价具有指导意义.

Modulation transfer function（MTF） is a key parameter for assessment of the imaging performance of in-flight optical sensors.This study focuses on the influences of major factors on the accuracy of knife-edge method by using theoretical analysis and simulation experiments.The analyzed factors include atmosphere,the incline angle of target,the contrast and random noise of target,the edge detection accuracy,and the ERF curve-fitting model.Accuracies in MTF assessment under different simulation parameters are also analyzed.The analysis results are instructive for implementation of on-orbit MTF assessment using knife-edge method.