基于刃边法的星载相机在轨MTF测量精度分析

摘要

Modulation Transfer Function(MTF) is a comprehensive and important parameter to assess the on-rnorbit performance of optical sensors. Firstly, this paper compares four kinds of usually used methods for on-orbit rnMTF estimation. Using simulation experiments, this paper focuses on analysing the main influencing factors of rnMTF test precision, including random noise, the edge detection accuracy and ERF curve-fitting model, and so on.rnThe results provide strong support for requirement of knife-edge method.%调制传递函数(MTF)反映可见光对地遥感系统在对地物成像过程中信号的扩散与削弱程度,是表达系统辐射性能的重要指标.文章对星载可见光CCD相机在轨MTF主要测量方法进行比对分析,通过数据仿真,重点对随机噪声、边缘探测与拟合等主要影响刃边法精度的因素进行了分析.分析结果表明,计算所用刃边法能够较准确地计算可见光遥感系统的MTF,并能较好地抑制噪声.