Research On Major Errors In Sight Determination Of Medium And Low Orbit Optical Satellites

As the most important tool for humans to use space,artificial satellites play an extremely important role.With the advancement of spatial information acquisition methods and the innovation of information processing capabilities,satellite observation and measurement technology is also constantly developing.In this paper,we focus on the related technologies of medium and low-orbit optical satellite line of sight determination.Optical line difference and atmospheric refraction are important sources of error in the determination of medium and low-orbit optical satellite line of sight.This paper mainly analyzes these two types of errors.Combined with the specific application characteristics of the middle and low orbits,the influence of these two types of errors on the determination of the mid-low orbit line of sight is discussed.The corresponding correction method is proposed.The effectiveness of the correction method is verified by simulation data.The specific content of the paper is:The second chapter introduces the relevant theoretical basis of satellite vision determination technology,including common coordinate system and its conversion relationship,and the general imaging model of the sensor.The main source of error and its structure in the process of determining the line of sight are analyzed.The third chapter studies the influence of the aberration on the line of sight of the medium and low-orbit optical satellites and the correction method.Firstly,the basic model of the aberration is introduced,and then the influence of the aberration on the line of sight of the medium and low-orbit optical satellites is analyzed,including the influence on the observation of the star and the influence on the determination of the target line of sight.On this basis,based on the existing research results,an aberration correction algorithm for medium and low-orbit optical cameras is proposed.The fourth chapter studies the influence of atmospheric refraction on the line of sight of medium and low-orbit optical satellites and the correction method.The main observation modes of the medium and low-orbital cameras and the motion characteristics of the key target points are analyzed,and the appropriate atmospheric model is selected accordingly.The influence of atmospheric refraction on the determination of the target line of the medium and low-orbit optical satellites is studied.On this basis,a targeted atmospheric refraction correction method is proposed.