人工衛星が宇宙へ打ち上げられ放出、運用を終了するまでに係る安全設計、および試験方法等に関する研究

走査型プローブ顕微鏡による金属、半導体などの表面および内部の電子構造計測、傾斜材料の内部構造観察および硬度プロファイル測定、ケルビンプローブによる電子構造計測

人工衛星に搭載するコンポーネントの試験標準を作成するべく、ダミー衛星を用いた各種環境試験条件の導出

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

ISO-19683, "Space systems - Design qualification and acceptance tests of small spacecraft and units" was published in July 2017. The standard describes the minimum test requirements and test methods for lean satellite and their units. The standard has served as a guideline for lean satellite testing for the past five years. The document, however, was made based on the state-of-art knowledge in early 2010s. In the past 10 years, much wider and deeper knowledge regarding the lean satellite testing has been gained. Also, in early 2010s, most of lean satellites was still one of a kind, dealing with a single satellite only. But, nowadays, we see many constellation programs especially in the area of CubeSats. The standard is now under revision process to reflect those points by December 2025. In the revision, the two points; (1) reflecting the state-of-art knowledge based on the experience of the past 10 years, (2) adding a chapter regarding testing of constellation satellite programs, will be considered. For the second points, basic research is being conducted about how to improve the testing efficiency and how to formulate a logic of skipping some tests for satellites of identical design. This paper describes the research results obtained through the basic researches, especially in visual inspection before/after vibration test and thermal vacuum testing, as well as the main points of revision.

DOI： 10.52202/078365-0108

Kyutacar

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

The BIRDS-X satellite project introduces Dragonfly, a 2U CubeSat based on the BIRDS Open-Source Bus system, with 100 x 100 x 227 mm dimensions. Developed at the Kyushu Institute of Technology by an international team of students, this satellite is dedicated to amateur radio communication, using a lean satellite approach. It aims to foster inclusivity and democratize space utilization. This paper comprehensively overviews the satellite's subsystem developments and four primary mission advances. These missions include an Automated Packet Reporting System (APRS) payload competition in which five teams from different countries developed a payload and integrated it into the satellite, making it an accessible rideshare opportunity for their payloads to be tested in space, a Ground Terminal (GT) APRS global competition, on-orbit validation of a low-cost UHF transceiver, and a unique volcano monitoring task where while using the APRS protocol, the satellite will store and forward volcanic data for processing and posting. With the launch scheduled for February 2025, this paper presents the steps taken towards achieving the project objectives. This work also highlights its contribution to the evolving CubeSat landscape and amateur radio development while committing to safety standards and operational readiness.

DOI： 10.52202/078365-0113

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85219187560&origin=inward

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

LEOPARD (Light intensity Experiment with On-orbit Positioning and satellite Ranging Demonstration) is a 3-unit (3U) research CubeSat with various mission objectives such as light-scattering observation over the horizon with a multispectral camera, onboard processing of Earth-origin one-way radio ranging signal (OPERA), single event latch-up (SEL) detection, solar panel deployment demonstration with shape memory alloy (SMA), and measurement of magnetic field independent components of stray and natural fields. The solar panel deployment mechanism utilizes shape memory alloy with a heater to ensure controlled panel deployment. In this paper, the structural design of the LEOPARD CubeSat is presented in addition to the assembly and integration procedures. Furthermore, structural analysis is presented from modal analysis to static load analysis, and the simulation of stress distributions and validation of structural integrity have been performed with finite element analysis. Vibration testing is also conducted to evaluate the system level response to mechanical excitations during launch, ensuring robustness against dynamic loads. LEOPARD used a slot-type design for subsystem integration that has been used in our previous satellites, and the novelty of the structure design comes from the deployment mechanism and method. Finally, the LEOPARD flight model is under testing, and the operation is expected to begin in the second half of 2025.

DOI： 10.52202/078379-0039

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85218458171&origin=inward

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

This study presents the BIRDS-X Ground Terminal Competition, an initiative aimed at generating outreach for the radio amateur community and fostering communication with the Dragonfly satellite. Aligned with the objectives set by Amateur Radio Digital Communications (ARDC), this competition engages amateur radio enthusiasts and rigorously tests the APRS ground terminals (GT) under diverse conditions. Comprising three phases: orientation, communication test, and evaluation, the competition organizes regional communication schedules to optimize the satellite's power budget. During the second phase, participants have a week-long window to establish contact with the satellite, providing log files, elevation data, and power output as evidence. The comprehensive evaluation in the final phase employs a grading system incentivizing compact, versatile, and affordable hardware, promoting accessibility to APRS technology. The established multipliers consider antenna type, station type, elevation angle, and cost. Moreover, two Reference Ground Terminals developed at Kyutech serve dual roles: facilitating performance evaluation for the APRS payload competition and offering technical insights for the Ground Terminal competition parameters. This paper highlights the significance of this competition in advancing the accessibility and performance of APRS technology in satellite communication.

DOI： 10.52202/078378-0127

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85219175572&origin=inward

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

We describe scientific o bjective a nd p roject s tatus o f a n a stronomical 6 U C ubeSat m ission V ERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat). The scientific g oal o f V ERTECS i s t o reveal the star-formation history along the evolution of the universe by measuring the extragalactic background light (EBL) in the visible wavelength. Earlier observations have shown that the near-infrared EBL is several times brighter than integrated light of individual galaxies. As candidates for the excess light, first-generation s tars in the early universe or low-redshift intra-halo light have been proposed. Since these objects are expected to show different e mission s pectra i n v isible w avelengths, m ulti-color v isible o bservations a re c rucial t o r eveal t he origin of the excess light. Since detection sensitivity of the EBL depends on the product of the telescope aperture and the field o f v iew, i t i s p ossible t o o bserve i t w ith a s mall b ut w ide-field te lescope sy stem th at ca n be mounted on the limited volume of CubeSat. In VERTECS mission, we develop a 6U CubeSat equipped with a 3U-sized telescope optimized for observation of the visible EBL. The bus system composed of onboard computer, electric power system, communication subsystem, and structure is based on heritage of series of CubeSats developed at Kyushu Institute of Technology in combination with high-precision attitude control subsystem and deployable solar array paddle required for the mission. The VERTECS mission was selected for JAXA-Small Satellite Rush Program (JAXA-SMASH Program), a new program that encourages universities, private companies and JAXA to collaborate to realize small satellite missions utilizing commercial small launch opportunities, and to diversify transportation services in Japan. We started the satellite development in December 2022 and plan to launch the satellite in FY2025.

DOI： 10.1117/12.3014708

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85204713953&origin=inward

開催期間： 2009年11月04日 - 2009年11月06日   記述言語：日本語   開催地：日本  

開催期間： 2009年03月29日 - 2009年04月02日   記述言語：日本語   開催地：日本 茨城県  

開催期間： 2009年03月25日 - 2009年03月27日   記述言語：日本語   開催地：日本 大阪府  

開催期間： 2008年10月28日 - 2008年10月31日   記述言語：英語   開催地：日本 Matsue  

開催期間： 2008年10月28日 - 2008年10月31日   記述言語：英語   開催地：日本 Matsue