Research On GEO Spatial Situation And Collision Avoidance Visualization

In recent years,with the increase of global satellite launch missions,a large amount of space junk exists in the GEO region in addition to a limited number of satellites,which occupies valuable space resources and poses a serious threat to the normal operation of GEO satellites.In order to ensure the safety of GEO satellite operation in orbit,it is necessary to conduct risk assessment of satellites and design avoidance strategies.With the continuous development of visualization technology,the space situation and space mission can be displayed more intuitively with 3D visualization technology.In this paper,we model and simulate the GEO satellite,analyze and study the collision risk assessment and avoidance strategy,and use 3D visualization technology to display the collision risk assessment and avoidance results.The main research contents are as follows:1.Research on space target orbit extrapolation model.Analyze and study the calculation methods and establish mathematical models of the two-body orbit extrapolation model,J2 orbit extrapolation model and HPOP orbit extrapolation model.By comparing the three extrapolation models with the HPOP model of STK,the space target orbit extrapolation model suitable for this topic is selected.2.GEO spatial posture generation.Analyze the satellite data released by Space-track,CEOS and ITU,design the space cataloguing database and link the tables;at the same time,analyze and design the space posture database,and use SCILAB to build a simulation project to generate GEO space posture.3.For the collision probability calculation and risk assessment research,based on the three-dimensional Gaussian distribution,the expression of three-dimensional numerical integration method to calculate the collision probability is derived,and the subset simulation method is used in the satellite collision probability calculation,and the feasibility of the method is verified,and then the simulation project is built to assess the GEO satellite collision risk according to the space station collision risk assessment threshold.4.Satellite avoidance strategy research.Starting from the principle of minimum energy consumption,the adaptation degree is constructed with the satellite expectation threshold and velocity increment,and the tournament selection is combined with the elite retention strategy to improve the genetic algorithm and calculate the velocity increment required for evasion.This paper takes GEO satellite as the research object,studies the problem of GEO satellite collision risk assessment and evasion strategy design,and visualizes the GEO spatial posture,collision risk assessment results and the expected evasion route,which is beneficial to observe GEO spatial environment,reduce satellite collision risk and guarantee the safe operation of GEO satellite.