基于反射点源的光学遥感卫星像点提取及精度验证  

Pixel Extraction and Accuracy Verification of Optical Remote Sensing Satellite Based on Reflected Point Source

作　　者：王强 徐伟伟[2] 司孝龙[2] 李鑫[2] 杨宝云[2] 张黎明[2] Wang Qiang;Xu Weiwei;Si Xiaolong;Li Xin;Yang Baoyun;Zhang Liming(Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,Anhui,China;Key Laboratory of Optical Calibration and Characterization,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China)

机构地区：[1]安徽大学物质科学与信息技术研究院,安徽合肥230601 [2]中国科学院合肥物质科学研究院通用光学定标与表征技术重点实验室,安徽合肥230031

出　　处：《光学学报》2024年第6期353-361,共9页Acta Optica Sinica

基　　金：“十三五”航天预研基金(GFZX0401430407)。

摘　　要：定标自动化水平与像点提取精度是光学遥感卫星在轨几何定标效率及精度提升的关键因素。提出一种以轻小型、自动化的反射点源为地面控制点的高精度像点提取方法,匹配参数化模型拟合获取点源像点坐标,并利用有理函数模型进行精度验证。在轨实验结果初步表明,与模板匹配法等常规方法相比,反射点源法提取的像点坐标精度优于0.05 pixel,经有理函数模型验证,像点定位精度优于0.05 pixel。反射点源不仅能够实现高精度的像点提取,还能够实现光学遥感卫星在轨几何辐射综合定标,对提高我国遥感测绘精度和定标自动化水平有重要意义。Objective The automation of calibration and the accuracy of pixel extraction are the key factors in improving the efficiency and accuracy of geometric calibration of optical remote sensing satellites in orbit.With the increasing number of optical remote sensing satellites in orbit and the continuous improvement of satellite image resolution,current level of calibration automation cannot meet future development needs.The coordinates of control points and their corresponding image points are input parameters for the geometric calibration of the camera.The accuracy of their measurement and extraction directly affects the accuracy and precision of the internal and external orientation element calibration of the satellite camera.The measurement accuracy of ground control points and on-orbit attitude has reached centimeter or even millimeter-level precision.However,the pixel extraction of control point images mainly relies on manual selection or pixel measurement algorithms,which cannot match the accuracy of control point measurements.Lightweight and automated quasi-stellar source-reflected point sources are proposed to be used as ground control points,along with an algorithm for matching pixel extraction from these sources.This will be combined with on-orbit calibration experiments based on reflected point sources to verify the accuracy of pixel extraction for optical remote sensing satellites.The objective of this paper is to improve the accuracy of pixel extraction,which in turn will enhance the geometric calibration and remote sensing image positioning accuracy of these satellites in orbit.Methods First,we propose a Gaussian model-based method for pixel extraction from reflected point sources and a rational function model-based method for verifying the accuracy of pixel extraction.Based on these principles,we design an experiment to verify the accuracy of pixel extraction from reflected point sources.Second,we analyse the experimental image and extract the pixels by the reflected point source method.The accuracy of

关 键 词：几何定标 像点提取 反射点源 精度验证 有理函数模型 

分 类 号：P236[天文地球—摄影测量与遥感]