摘要
质心定位精度不仅是影响星载激光测高仪姿态精度的关键因素之一,也是探测卫星平台颤振的一种新型技术手段。针对GLAS星载激光光斑图像的自身特点,首先改进了传统的灰度加权方法,其次利用超分辨率重建方法提高了激光光斑图像的空间分辨率。通过多种质心定位方法提取星载激光光斑质心坐标,并全面对比分析多种质心提取方法的定位精度,阐述不同方法的优缺点。实验结果表明:高斯曲面拟合与改进的灰度加权方法的定位精度均可以应用于卫星平台的颤振探测,可依据实际工程的效率需求选取相应的质心定位方法;超分辨率重建方法应用于激光光斑图像质心定位具有可行性,定位精度较传统的质心提取方法有所提高。
Centroid location accuracy is not only one of the key factors that affect the attitude accuracy of spaceborne laser altimeter,but also a new technique to detect the jitter of satellite platform.According to the characteristics of GLAS satellite laser spot image,firstly,the traditional gray-scale weighting method is improved,secondly,the super-resolution reconstruction method is used to improve the spatial resolution of the laser spot image.The centroid coordinates of the satellite laser spot are extracted through various centroid positioning methods,the positioning accuracy of various centroid extraction methods is comprehensively compared and analyzed,and the advantages and disadvantages of different methods are described.The experimental results show that the positioning accuracy of Gaussian surface fitting and the improved gray-scale weighting method can be applied to satellite platform jitter detection,and the corresponding centroid positioning method can be selected according to the efficiency requirements of the actual project.The super-resolution reconstruction method is feasible for the laser spot image centroid positioning,and the positioning accuracy is improved compared with the traditional centroid extraction method.
作者
朱红
谢俊峰
孙广通
刘小阳
么嘉棋
ZHU Hong;XIE Junfeng;SUN Guangtong;LIU Xiaoyang;YAO Jiaqi(College of Ecology and Environment,Institute of Disaster Prevention,Langfang,Hebei 065201,China;Land Satellite Remote Sensing Application Center,MNR,Beijing 100048,China;College of Geomatics,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)
出处
《遥感信息》
CSCD
北大核心
2021年第2期1-5,共5页
Remote Sensing Information
基金
河北省教育厅高等学校科学研究计划项目(Z2020119)
中央高校基本科研业务费项目(Z2020119)
廊坊市科学技术研究与发展计划自筹经费项目(2019011053)
河北省自然科学基金项目(D2020512001)
“十三五”民用航天技术预先研究项目(D040106)
国家自然科学基金项目(41571440、41771360)
国家青年科学基金项目(41301525)
国家测绘地理信息局青年学术带头人基金项目(201607)
高分专项(民用部分)科研项目(42-Y20A11-9001-17/18)。
关键词
激光光斑
质心定位
灰度加权
高斯曲面拟合
椭圆拟合
超分辨率重建
laser spot
centroid location
gray-scale weighting
Gaussian surface fitting
ellipse fitting
super resolution reconstruction
