Spacecraft detumbling
process of reducing or eliminating unwanted angular velocity (tumbling) of a spacecraft following launcher separation or an external perturbation
Spacecraft detumbling is the process of reducing or eliminating unwanted angular velocity (tumbling) of a spacecraft following launcher separation or an external perturbation. Detumbling is the first task to be performed by the spacecraft's attitude control system and it is therefore critical to ensure safe satellite operations, enabling reliable communication, solar power generation, navigation, and the subsequent nominal mission.
In order to minimize the risk of failure during this process, stringent requirements on the reliability of the involved actuators and sensors and on the simplicity of the adopted control algorithm are usually driving the design of the detumbling.
Spacecraft detumbling techniques can also be applied to the handling and removal of space debris.
History
Early efforts investigating detumbling strategies focused on passive methods like magnetic damping and gravity-gradient stabilization. Modern satellites typically employ an active detumbling control, either purely magnetic or including additional actuators, such as reaction wheels or thrusters. Current efforts in detumbling research focus on advanced control for underactuated systems or the integration of machine learning to improve detumbling performance.
Common detumbling strategies
Magnetic control
The basic magnetic attitude control system is composed of magnetorquers as actuators and magnetometers as sensing elements. A fully-magnetic attitude control system is currently implemented in several space missions, especially for smaller classes of satellites. Magnetic rods and magnetometers are selected for their reliability, low mass and energy efficiency advantages.
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