| The increasing number of space activities has produced a large amount of space debris,which has seriously polluted the space environment.In recent years,due to the continuous development of deep space exploration,ground observation and spacecraft formation flying and other related researches,the requirements for pointing precision and position accuracy of high-precision spacecraft for executing missions have become higher and higher.The effect of space debris impacting high-precision spacecraft on its pointing performance and positioning performance can not be ignored.Based on this requirement,the paper establishes a dynamic model of space debris impacting a spacecraft and analyzes the process of space debris impacting a high-precision spacecraft.Finally,the space debris impact on the spacecraft is pointed out and positioned the statistical law of performance impact by the Monte Carlo simulation test.This paper firstly obtains the attitude kinematics and dynamics model of spacecraft based on the knowledge of spacecraft attitude kinematics and dynamics.Based on this,the dynamic model of space debris impacting spacecraft is established and the spacecraft is designed and given pointing performance and positioning performance related evaluation indicators.Secondly,using the Hubble telescope as an example,we give Hubble's orbital data and simplified geometry model,use the SDEEM software to output the spatial debris environment data of Hubble's orbit and use the controlled variable method to study the impact of space debris on the spacecraft.The influence of the change of parameters on the positioning performance of spacecraft.The results show that the change of debris size has the greatest influence on drift distance and velocity increment.The influence of impact position on the direction of drift distance and velocity increment is significant.When the debris impact azimuth is in the range of-5°to 5°,Hubble is After the impact,the drift distance and velocity increment are the largest.When the debris impact azimuth angle is around±140°,the drift distance and velocity increment after Hubble is minimized.Third,based on the Z-buffer algorithm,the Hubble telescope is blanked,and the impact parameters and impact time are generated by the stochastic simulation method.The impact of space debris impact on Hubble's directional performance and positioning performance is simulated and analyzed in one day.The results show that the azimuth of the Hubble observation axis is mainly distributed between-50 arcseconds and 50 arcseconds after one day of impact,and the probability is the largest at 0 arcseconds to10 arcseconds,and the pitch angle is mainly distributed at-100 arcseconds to 100 degrees.Between the arcseconds,the probability is between-10 arc seconds and 0 arc seconds.Hubble observation axis change rate is mainly between 1*10-11rad/s and 1*10-7rad/s,and the greatest probability is about 1*10-9rad/s.The drift distance is mainly distributed between 10-5m and 10-2m,and the greatest probability is about 10-4m;the speed increment is mainly between 10-9m/s and 10-6m/s and the greatest probability is about 10-8m/s.Finally,based on the ray method,the Hubble telescope was subjected to blanking analysis,and a limited number of ray records of the space debris parameters and impact positions were obtained.The impact parameters and the impact time were generated by a random simulation method,and Monte Carlo numerical simulation method was used to obtain one day.The statistical law of impact of space debris impact on Hubble's pointing and positioning performance was compared with each other by the results of two blanking algorithms,which further validated the correctness of the statistical laws of the obtained pointing and positioning performance.The research results obtained in this paper provide reference for further improving the pointing and positioning performance of China's high-precision spacecraft.It has certain guiding significance for attitude stability and position stability of high-precision spacecraft,and has certain engineering application value. |
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