光学学报, 2019, 39 (7): 0728006, 网络出版: 2019-07-16   

基于地面周期靶标的光学遥感相机在轨调制传递函数测量方法 下载: 891次

On-Orbit Measurement of Modulation Transfer Function for Optical Remote Sensing Cameras Based on Periodic Ground Targets
作者单位
上海卫星工程研究所, 上海 201109
摘要
为了克服传统的基于周期靶标的在轨调制传递函数测量方法中测量精度过分依赖靶标组数的问题,通过对传统方法的原理进行深入剖析,提出了一种新的测量方法。在获得多组具有一定相位差异的地面周期靶标图像数据后,充分利用所有采样数据及相应相位关系,进行参数拟合,得到地面靶标经成像系统后的调制度,对比输入调制度计算调制传递函数。仿真及实际光学遥感相机的实验结果表明:仅利用两组靶标,理论上所提方法的测量精度可优于0.5%;测试图像噪声、靶标周期匹配偏差、测量角度匹配偏差等因素对测量误差的影响均在4%以内,该测量方法的适应性较高。所提方法的计算结果与倾斜刃边法具有良好的一致性,可以应用于高分辨率光学遥感相机的在轨调制传递函数测量。
Abstract
In traditional on-orbit modulation transfer function (MTF) measurements based on periodic targets, there is a known overdependence of the achieved accuracy on the number of target groups. The method introduced in this study aims to overcome such reliance, through a thorough analysis of the principle of the traditional method. We first collect the imaging data of multiple groups of ground periodic targets with certain phase differences and then calculate the output modulation of the imaging system by parametric fitting using all the sampling data as well as the relative phase relations. Subsequently, we compare the input and output modulations to obtain the MTF. We also perform a simulation and a series of experiments of real remote sensing cameras to assess the effectiveness of our method. The results theoretically reveal a small measurement error of less than 0.5% using only two groups of targets, whereas the errors caused by image noise and target-periodic- and measuring-angle matching deviations are less than 4%. This method has good adaptability, and is consistent with the slanted-edge method; therefore, it can be easily applied to on-orbit MTF measurements of high-resolution optical remote sensing cameras.

吴泽鹏, 曲耀斌, 赵庆广, 扈宗鑫. 基于地面周期靶标的光学遥感相机在轨调制传递函数测量方法[J]. 光学学报, 2019, 39(7): 0728006. Zepeng Wu, Yaobin Qu, Qingguang Zhao, Zongxin Hu. On-Orbit Measurement of Modulation Transfer Function for Optical Remote Sensing Cameras Based on Periodic Ground Targets[J]. Acta Optica Sinica, 2019, 39(7): 0728006.

本文已被 1 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!