Influence Of Satellite Platform Andcamera Performance On 3D Reconstruction Accuracy Of Target

With the rapid de velopment of space technology,satellite o n-orbit maintenance,fuel secondary filling,s pace garbage remo val and other on-orbit service technology have became research hotspot of the countries with str ong strength in aerospace.In the on-orbit service,accurately accessing the target s atellite 3D structure and surface texture informatio n plays a crucial role in the decision of target re nde zvo us and re pair parts.Therefore,based on the sequence image to carry out 3D reconstruction of the target of the future on-orbit service has important guiding significance.Due to the particularity of the s atellite operating environment,the 3D reconstruction accuracy of the target is not o nly affected by the characte ristics of the reconstruction algorithm itself,but also affected by the s atellite platform and camera performance.This paper focuses o n the 3D reconstruction mechanism based on seque nce image,and explores the influe nce of platform and camera performance on the 3D reconstruction accuracy of the target.The research work includes the following aspects:(1)The influence of satellite platform and camera performance on image quality is studied.Considering the characteristics of the platform(motion,jitter,etc.)and the characteristics of the c amera(different defocus,integratio n time,pixel resolution,etc.),the on-orbit s atellite imaging link mo del is constructed base d on signal transduction and spatial mo dulation.The simulation results of the typic al target s atellites are c arried out,and the seque nce images running o n the orbit are obtained.The impact of image quality of defocusing height,the platform motion and jitter of the s atellite platform,the defocus amount of the c amera,the inte gration time,the CCD pixel size(resolution)was analyze d.The results pro vide input data for subsequent 3D reconstruction studies.(2)A 3D reconstruction method based on seque nce image is de velo ped.The 3D reconstruction process of the target is studie d in detail f rom the aspects of coordinate s ystem transformation,feature point extraction and matching,sparse point cloud reconstruction,dense point cloud reconstruction,and a 3D reconstruction model based o n seque nce image was constructed to find out the 3D information of the target from the 2D image taken by the camera.A series of image operations are performed by fe ature e xtraction,image matching,s parse point cloud reconstruction and dense point cloud reconstruction,and the target 3D reconstruction is completed.At the same time,the e valuation index of 3D reconstruction precision is constructed,and the results of reconstruction acc uracy evaluation are given.(3)The influence of s atellite platform and c amera performance on the 3-D reconstruction accurac y of the target is studied.Based o n the simulation results,the effects of platform height,high freque ncy jitter,random jitter,line ar motion,c amera angle,defocus,e xposure time and pixel size are analyze d.The experimental results show that when the height of the s atellite platform is less than 500 m,the high frequency jitter amplitude is less than 6um,the displacement standard de viatio n is less than 0.01,the camera angle interval is less than 6 de grees,and the defocus quantity is less than 0.05 mm,the reconstruction error can be less than 10% and integrity is greater than 90% of the index requirements.In summary,the analysis of impact of satellite platform and camera performance on the 3D reconstruction accuracy of the target,not only assess the performance of the 3D reconstruction algorithm based o n sequence image,but also put forward design requirements of satellite platform and camera performance and pro vide tec hnic al reserves for the follow-up objectives in the re alization of 3D reconstruction.