國立虎尾科技大學 |

Optical Jitter Metrology for Precision Pointing Satellites.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Optical Jitter Metrology for Precision Pointing Satellites./
作者:	Urasaki, Chase Masao.
面頁冊數:	1 online resource (125 pages)
附註:	Source: Masters Abstracts International, Volume: 85-12.
Contained By:	Masters Abstracts International85-12.
標題:	Astronomy. -
電子資源:	click for full text (PQDT)
ISBN:	9798383124376

Optical Jitter Metrology for Precision Pointing Satellites.
Urasaki, Chase Masao.

Optical Jitter Metrology for Precision Pointing Satellites. - 1 online resource (125 pages)

Source: Masters Abstracts International, Volume: 85-12.

Thesis (M.S.)--University of Hawai'i at Manoa, 2023.

Includes bibliographical references

In recent years, the popularity of CubeSatellites, or CubeSats, for space missions has grown exponentially. They provide a miniature, standardized form factor and prioritize the use of commercial-off-the-shelf (COTS) components that reduce the size, weight, and power of space missions. Their compact size and cost-effectiveness are well suited to demonstrate and raise the technology readiness of smaller and higher-performing payloads. However, the increasing pointing requirements that come with these payloads and lower overall satellite mass means that jitter caused by moving or vibrating parts in CubeSats is a fundamental limit in their performance. Typical methods of characterizing jitter involve complex finite element methods, measuring jitter requires high costs in equipment and laboratory setups, as well as significant modification in the mass and inertial properties of the subject. This is due to adapting plates on dynamometers which introduce both size and frequency constraints. Alternatively, jitter measurements taken in space after launch do not allow the modification of the satellite or its components to achieve more optimal jitter characteristics. This makes in-situ measurements useful as a method of evaluation since there are no external damping effects, but, because the satellite is in space, cannot be a part of the design process. In this thesis, I describe a novel method of characterizing jitter for small satellite systems that is low-cost, simple, and minimally modifies the subject's mass distribution. The metrology system is comprised of a COTS fiber-coupled laser source, a small mirror that is rigidly mounted to the satellite structure, and a lateral effect position-sensing detector. The system samples at a frequency of 1kHz and can measure jitter as low as 0.154 arcseconds over a measurement distance of 1 meter. I also developed a procedure that incrementally analyzes vibrating sources to establish causal relationships between sources and the vibrating frequency modes they create. Results from power spectral density plots show that this method can detect fundamental and higher-order vibrating modes in a fully integrated 6U spacecraft. The analysis is focused on attributing the causation of these modes to vibrating sources (such as reaction wheels and the cryocooler), verifying these correlations, and determining their pointing error contribution. We expect that this metrology system can serve to not only detect and characterize jitter in fully integrated small satellites and imaging systems from vibration sources but also verify vibrating satellite bus component performance like those from reaction wheels.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798383124376Subjects--Topical Terms:

593935
Astronomy.
Subjects--Index Terms:

CubeSatsIndex Terms--Genre/Form:

554714
Electronic books.

Optical Jitter Metrology for Precision Pointing Satellites.
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520 $a In recent years, the popularity of CubeSatellites, or CubeSats, for space missions has grown exponentially. They provide a miniature, standardized form factor and prioritize the use of commercial-off-the-shelf (COTS) components that reduce the size, weight, and power of space missions. Their compact size and cost-effectiveness are well suited to demonstrate and raise the technology readiness of smaller and higher-performing payloads. However, the increasing pointing requirements that come with these payloads and lower overall satellite mass means that jitter caused by moving or vibrating parts in CubeSats is a fundamental limit in their performance. Typical methods of characterizing jitter involve complex finite element methods, measuring jitter requires high costs in equipment and laboratory setups, as well as significant modification in the mass and inertial properties of the subject. This is due to adapting plates on dynamometers which introduce both size and frequency constraints. Alternatively, jitter measurements taken in space after launch do not allow the modification of the satellite or its components to achieve more optimal jitter characteristics. This makes in-situ measurements useful as a method of evaluation since there are no external damping effects, but, because the satellite is in space, cannot be a part of the design process. In this thesis, I describe a novel method of characterizing jitter for small satellite systems that is low-cost, simple, and minimally modifies the subject's mass distribution. The metrology system is comprised of a COTS fiber-coupled laser source, a small mirror that is rigidly mounted to the satellite structure, and a lateral effect position-sensing detector. The system samples at a frequency of 1kHz and can measure jitter as low as 0.154 arcseconds over a measurement distance of 1 meter. I also developed a procedure that incrementally analyzes vibrating sources to establish causal relationships between sources and the vibrating frequency modes they create. Results from power spectral density plots show that this method can detect fundamental and higher-order vibrating modes in a fully integrated 6U spacecraft. The analysis is focused on attributing the causation of these modes to vibrating sources (such as reaction wheels and the cryocooler), verifying these correlations, and determining their pointing error contribution. We expect that this metrology system can serve to not only detect and characterize jitter in fully integrated small satellites and imaging systems from vibration sources but also verify vibrating satellite bus component performance like those from reaction wheels.
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