The Research On Calibration Of Line-of-Sight For Space-Based Surveillance Satellite

With the continuous development of space technology,the demand of space mission to the accuracy of satellite payload' line-of-sight(LOS)calibration is higher and higher.The LOS calibration of satellite load is an important component and key technology of the space target surveillance system.The accuracy of the LOS calibration directly determines the target localization accuracy,and affects the overall performance of the space target surveillance system.To solve this problem,this dissertation introduces the star map identification of the imaging load,the LOS calibration of integral pendulum sweep camera and the LOS of scan mirror pendulum sweep camera.The detail of the research content is as follows:(1)In the second chapter,the basic theory of the LOS calibration is introduced.Firstly,the dissertation introduces the two kinds of imaging model,the integral pendulum sweep camera and the scan mirror pendulum sweep camera respectively.Then the dissertation analyzes the main error factor of LOS calibration.Finally,put forward the technical process of LOS calibration.(2)In the third chapter,the star map identification is researched.Firstly,based on the characteristic of imaging load,fast star selection algorithm is put forward,and the traditional triangle recognition algorithm is improved,finally achieves the identification of the star,and lays the foundation of LOS calibration.(3)In the fourth chapter,the LOS calibration of integral pendulum sweep camera is researched.Based on the characteristic of the LOS error of the integral pendulum sweep camera,put forward the equivalent loss angle to calibrate the LOS.Through the theoretical analysis and experimental simulation prove the feasibility of the method.Then,Laser gyro is proposed to directly install on the cameral body combined with the optical cameral observing filter method,which effectively eliminates the satellite location error,speed error,platform attitude error,pointing to the institutions error and the installation error.(4))In the fifth chapter,the LOS calibration of scan mirror pendulum sweep camera is researched.Based on the internal complex deformation,establish complete thermal deformation model.Using numerical simulation method simplifies the model complexity.Then the dissertation puts forward the general imaging correction method of the model.According to the characteristic of the scanning camera,the block interpolation correction method is proposed.The dissertation solves the problem that under the condition of uneven distribution of feature points,the LOS calibration accuracy is not high.