Ultra-Fine Pointing for Nanosatellite Telescopes With Actuated Booms
2022 IEEE Aerospace Conference (AERO)(2022)
Abstract
The smallsat revolution has impacted the architecture of most modern satellites with the notable exception of fine-pointing space telescopes. Conventional attitude control hardware scales poorly as the spacecraft gets smaller, resulting in significant mass and performance penalties for nanosatellites with strict pointing requirements. This paper presents a novel attitude actuation and planning strategy that utilizes actuated booms with tip masses and magnetorquers for three-axis pointing and momentum desaturation. The speed of the booms is an appropriate match for the slowly varying environmental disturbance torques encountered in low-Earth orbit. As a result, these booms do not create the high-frequency jitter that reaction wheels do, lessening the need for complex second-stage correction hardware in the payload. An optimization-based motion planner is able to reason about the orbital ephemeris to ensure the booms never exceed their actuation limits, and a Linear Quadratic Gaussian controller is able to maintain fine-pointing during times of payload operation.
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Key words
ultra-fine pointing,nanosatellite telescopes,actuated booms,smallsat revolution,modern satellites,notable exception,space telescopes,conventional attitude control hardware scales,significant mass,performance penalties,nanosatellites,strict pointing requirements,attitude actuation,planning strategy,tip masses,magnetorquers,three-axis,momentum desaturation,environmental disturbance torques,low-Earth orbit,high-frequency jitter,second-stage correction hardware,actuation limits,Linear Quadratic Gaussian controller
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