基于三线靶标法的在轨MTF评价方法及其精度分析研究  

A Research on MTF for On-orbit Estimation and Accuracy Analysis Based on Three-bar Method

作　　者：王琦[1,2] 李显彬[1] 李晓辉[1] 唐伶俐[1] 

机构地区：[1]中国科学院光电研究院,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《遥感信息》2011年第1期14-21,共8页Remote Sensing Information

基　　金：国家863重点支持项目(编号:2008AA121805)

摘　　要：首先介绍了三线靶标法在轨MTF评价的研究进展、分析了三线靶标法的优点和存在的问题;其次在介绍三线靶标法原理的基础上,提出了三线靶标的布设要求和靶标数据处理方法;最后本文基于理论分析和仿真实验,重点分析了相关因素(靶标尺寸,传感器光谱响应函数,相对采样相位,靶标相对倾角,靶标对比度与随机噪声等)对三线靶标法评价精度的影响,为实施三线靶标法在轨MTF评价提供理论指导,并为评价结果提供了定量化的精度分析。Modulation Transfer Function（MTF） is one of the most comprehensive and standard measure to characterize the on-orbit performance of optical sensors.Estimation methods of on-orbit MTF can generally be divided into three-bar method,point source/array method,pulse method,knife-edge method and bi-resolution method according to the target.Among those methods,three-bar method is relatively straightforward,and it is widely used in laboratory measurement and on-orbit estimation.In this paper,quantifying the error contribution of each factor in on-orbit MTF estimation using three-bar method is focused,after the principle and relevant factors of on-orbit MTF estimation methods are systematically studied.It begins with a briefly introduction to MTF estimation,especially based on three-bar method.Secondly,the requirements of three-bar target deploying,the principle and basic processing steps of three-bar MTF estimation method are presented.Thirdly,the main factors and their impact on MTF estimation accuracy in three-bar method is stressed based on theoretical analysis and simulation experiment,including target size,reflectivity of target and the Spectral Response Function of system,relative sampling phase,the angle between orbit and three-bar,the contrast of three-bar target,the random noise during image acquisition,and so on.Finally,the guidelines for on-orbit MTF estimation using three-bar method are proposed.

关 键 词：三线靶标法 MTF 精度分析 仿真实验 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]