The Simulation Analysis Of Active Debris Removal Of Multiple Targets In A Single Task

The increasing number of space debris has seriously affected the normal operation of spacecraft and satellites in orbit,and may even lead to devastating disasters.In order to fundamentally control the increase of the number of space debris and eliminate the threat of space debris to space activities,active debris removal technology will be the new ideas to deal with the problem of space environment in the future.The active debris removal involves two aspects: how to select debris as the target and how to remove it.Since the sun synchronous orbit is particularly important and the number of debris is very large,this paper chooses the debris on the solar synchronous orbit as the target in the study.Using the method of chemical propulsion to analyze the debris generated by the space activities in China,it is concluded that 6 pieces of small debris in the sun synchronous orbit can be removed each year.And pointed out that the need for active space debris removal on the speed increment is very high and a single task is difficult to remove multiple large pieces of debris。There is a big gap between clearing 5 large pieces of more than ton block between the targets.In order to achieve this goal,this paper presents an innovative removal scheme-using collision energy transfer to remove space debris pointing at the difficulty of increasing the speed demand.In the research of the removal of debris by chemical propulsion,ant colony optimization algorithm is used to study the path optimization of multi debris in the removal progress.Then the modified steepest descent method is used to optimize the time of removing each piece of debris reasonably which further reduces the aggregate requirements of velocity increment.In comparison with the order of orbit height,inclination or RAAN,using the order after the optimization of the ant colony algorithm can greatly save the velocity increment.The results show that the optimized order may be different from three kinds of order mentioned above and the optimized order can save more velocity increment in the same task time when we choose three groups of debris produced in Chinese activities to optimize.In addition,the task time also has an impact on the best removal order of debris.The collisional energy transfer method is applied to the removal of space debris in a creative way.The characteristics of the collisional energy transfer is to transfer the energy carried by the debris to the spacecraft by collision,and to assist the spacecraft in orbit transfer,so as to achieve the purpose of saving fuel.Based on the analysis of the factors that affect the central collision and the non-central collision,the area is found which has low performance requirements to the net and is suitable for multiple collisions.Then aerodynamic assisted orbit transfer will be used to adjust the spacecraft orbital parameters to complete collisions between the spacecraft and the other target debris.