摘要
传统调制传递函数(MTF)检测方法不仅依赖于人工靶标或典型地物目标,还受大气干扰较多,检测周期较长.在传统方法基础上,提出了一种基于机场目标的MTF在轨检测方法,分析了检测过程中的大气干扰特性并建立MTF补偿模型.采用分布在全球多地的大中型机场作为检测目标,探讨了快速MTF在轨检测的可行性,并利用全球9座机场共12组数据开展了在轨MTF快速检测验证试验,以560 nm波段为例,与官方MTF检测结果平均偏差0.017.在气溶胶光学厚度较薄的条件下,以Sentinel-2卫星多光谱影像作为测试对象,对4座机场开展了机场目标MTF在轨检测可行性和快速MTF在轨检测方法验证实验,与官方的Sentinel-2卫星MTF检测结果进行比对,二者的平均绝对偏差小于0.04.该方法可在短期内实现对MTF指标的高频次检测,消除单次检测结果的偶然性,提高检测结果可靠性和稳定性.
Abstract
Traditional modulation transfer function(MTF)detection method not only relies on artificial targets or typical ground targets,but also suffers from large atmospheric interference and a long detection cycle.Based on the traditional method,an on-orbit MTF detection method based on airport targets is proposed to analyze the characteristics of atmospheric interference in the detection process and to provide the MTF compensation method.The feasibility of rapid on-orbit MTF detection is explored by using large and medium-sized airports distributed in many places around the world as detection targets.Furthermore,a validation test of rapid on-orbit MTF detection is conducted using a total of 12 data sets from nine airports around the world.For example,an average deviation of 0.017 is used from the official MTF detection result in the 560 nm band.Under the condition of thin aerosol optical thickness,the feasibility of on-orbit detection of airport target MTF and validation of the rapid on-orbit detection method of MTF are conducted for four airports using Sentinel-2 multispectral images as test objects and compared with the official Sentinel-2 satellite MTF detection results.Specifically,the average absolute deviation of the two results is less than 0.04.Hence,the method can realize the high-frequency detection of MTF indices in a short period of time.This in turn eliminates the contingency of the results of a single detection and improves the reliability and stability of the detection results.
NETL
NSTL
万方数据