Fuel-optimal deorbit scheme of space debris using tethered space-tug based on pseudospectral method  

作　　者：Haiping RAO Rui ZHONG Pengjie LI 

机构地区：[1]School of Astronautics,Beihang University,Beijing 100191,China

出　　处：《Chinese Journal of Aeronautics》2021年第9期210-223,共14页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.11772023)。

摘　　要：This paper proposes a fuel-optimal deorbit scheme for space debris deorbit using tethered space tug.The scheme contains three stages named respectively as dragging,maintenance and swinging.In the first stage,the tug,propelled by continuous thrust,tows deorbit to a transfer orbit with a tether.Then in the second stage,the combination of the tug and the debris flies unpowered and uncontrolled to a swing point on the transfer orbit.Finally,in the third stage,the tug is propelled at the swing point and the rotation speed of the tethered system increases such that the debris obtains enough velocity increment.The trajectory optimization of the first stage is established considering the total fuel consumption of the three stages,whereas the dynamic model is simplified for computation efficiency.The solution to the optimal problem is obtained using a direct method based on Gauss pesudospectral discretization.Then a model predictive controller is designed to track the open-loop optimal reference trajectories,reducing the states’deviations caused by model simplification and ignorance of perturbations.Furthermore,it is proved that the fuel-optimal swing point is the apogee of the transfer orbit.The paper analyzes the fuel consumption of a typical scenario and demonstrates effectiveness of the proposed deorbit scheme numerically.

关 键 词：Gauss pesudospectral Model predictive controller Fuel-optimal deorbit scheme Space tethered tug Space debris deorbit 

分 类 号：V528[航空宇航科学与技术—人机与环境工程]