Spacecraft angular momentum control method and system based on Hall electric propulsion self-generated torque

Abstract

A spacecraft angular momentum control method based on self-generated torque of a Hall thruster comprises the following steps that (1) obtaining the thrust pointing angle of each thruster according toconfiguration and layout positions of the thrusters of a Hall propulsion system on a spacecraft; (2) determining the torque generated when each thruster works; (3) determining the positive and negative directions of the exciting current of the thruster according to the relationship between the exciting current direction and the torque direction; (4) according to the torque vector direction of eachthruster, establishing a corresponding relational expression of the exciting current direction of each thruster to torque components generated by three axes of the spacecraft; (5) obtaining a three-axis angular momentum control demand of the spacecraft, and determining a torque in a target direction; and (6) according to the task strategy of on-orbit work of the Hall electric propulsion system, by calling the exciting current direction enabling the thruster to generate the target torque direction during work, subjecting torque generated by the thruster on the three axes of the satellite to superposition or offset control so as to generate torque in the target direction.

Description

technical field [0001] The invention relates to a method for controlling the angular momentum of a spacecraft, which belongs to the field of spacecraft propulsion. Background technique [0002] As the core unit of the Hall electric propulsion system, the Hall thruster's working thrust characteristics determine the thrust output characteristics of the system, and also affect the application strategy of the system on the spacecraft. According to the working principle of the propulsion system, when the Hall thruster is working, the ions generated by ionization form a plasma jet with a speed of about 20000m / s under the action of the space orthogonal electromagnetic field in the acceleration zone, and the ion beam current depends on the discharge power of the thruster Different, usually reach the order of 1 ~ 10A. The ion beam current interacts with the radial magnetic field (magnitude of about 0.02-0.04T) of the thruster, which will generate The Lorentz force in the direction...

AI Technical Summary

Problems solved by technology

Therefore, when the Hall propulsion system works for a long time, the angular momentum of the spacecraft will be significantly accumulated due to the self-generated torque, which will have an adverse effect on the attitude control, resulting in faster accumulation of the angular momentum of the spacecraft, increasing the burden on the attitude and orbit control system, and consuming more Propellant for momentum offloading

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