研究者詳細 - 趙　孟佑

論文 - 趙　孟佑

分割表示643 件中 21 - 40 件目／全件表示 >>

Development of an efficient Mono-frame CubeSat platform for fast and demanding missions 査読有り

Eyoas Ergetu AREDA*, Hirokazu MASUI, Mengu CHO

11th Nanosatellite Symposium 2022年10月

Mission Assurance Handbook for University-based Lean Satellites 査読有り

Mengu Cho, Yoshihiro Tsuruda, Masahiro Furumoto, Kikuko Miyata, Yukihito Kitazawa, Toshinori Kuwahara

73rd International Astronautical Congress 2022年09月

Lower Ultra-High Frequency Non-Deployable Omnidirectional Antenna for Nanosatellite Communication System 査読有り

Alam T., Sheikh M.M., Aldhaheri R.W., Singh M.S.J., Cho M., Islam M.T., Alharbi K.H., Islam M.S.

Nanomaterials 12 ( 18 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The concept of the nanosatellite comes into play in launching miniaturized versions of satellites or regarding payloads with minimizing cost and building time. The economic affordability of nanosatellites has been promoted with a view to launching various nanosatellite missions. The communication system is one of the most important aspects of a satellite. The antenna is a key element for establishing a communication link between the earth and the nanosatellite. The antenna and solar panel of the nanosatellite are two of the most vital components that profoundly impact antenna type and design. This paper proposes a non-deployable lower ultra-high frequency (UHF) antenna, strategically mounted on the satellite body, to address the constraints of deployment complexity and solar panel integration. The antenna was fabricated and performances measured with a 1U nanosatellite structure, which achieved resonance frequency at 401 MHz frequency bands with 0.672 dBi realized gain. The overall antenna size is 0.13λ × 0.13λ × 0.006λ. The major challenges addressed by the proposed antenna are to design a nanosatellite-compatible lower UHF antenna and to ensure solar irradiance into the solar panel to minimize input power scarcity.

DOI： 10.3390/nano12183143

Scopus

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Scalable and Configurable Electrical Interface Board for Bus System Development of Different CubeSat Platforms 査読有り国際誌

Sejera M., Yamauchi T., Orger N.C., Otani Y., Cho M.

Applied Sciences (Switzerland) 12 ( 18 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

A flight-proven electrical bus system for the 1U CubeSat platform was designed in the BIRDS satellite program at the Kyushu Institute of Technology. The bus utilizes a backplane board as the mechanical and electrical interface between the subsystems and the payloads. The electrical routes on the backplane are configured by software using a complex programmable logic device (CPLD). It allows for reusability in multiple CubeSat projects while lowering costs and development time; as a result, resources can be directed toward developing the mission payloads. Lastly, it provides more time for integration and system-level verification, which are critical for a reliable and successful mission. The current trend of CubeSat launches is focused on 3U and 6U platforms due to their capability to accommodate multiple and complex payloads. Hence, a demonstration of the electrical bus system to adapt to larger platforms is necessary. This study demonstrates the configurable electrical interface board’s scalability in two cases: the capability to accommodate (1) multiple missions and (2) complex payload requirements. In the first case, a 3U-size configurable backplane prototype was designed to handle 13 mission payloads. Four CPLDs were used to manage the limited number of digital interfaces between the existing bus system and the mission payloads. The measured transmission delay was up to 20 ns, which is acceptable for simple serial communications such as UART and SPI. Furthermore, the measured energy consumption of the backplane per ISS orbit was only 28 mWh. Lastly, the designed backplane was proven to be highly reliable as no bit errors were detected throughout the functionality tests. In the second case, a configurable backplane was implemented in a 6U CubeSat with complex payload requirements compared to the 1U CubeSat platform. The CubeSat was deployed in ISS orbit, and the initial on-orbit results indicated that the designed backplane supported missions without issues.

DOI： 10.3390/app12188964

Scopus

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Performance Evaluation of Machine Learning Methods for Anomaly Detection in CubeSat Solar Panels 査読有り国際誌

Cespedes A.J.J., Pangestu B.H.B., Hanazawa A., Cho M.

Applied Sciences (Switzerland) 12 ( 17 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

CubeSat requirements in terms of size, weight, and power restrict the possibility of having redundant systems. Consequently, telemetry data are the primary way to verify the status of the satellites in operation. The monitoring and interpretation of telemetry parameters relies on the operator’s experience. Therefore, telemetry data analysis is less reliable, considering the data’s complexity. This paper presents a Machine Learning (ML) approach to detecting anomalies in solar panel systems. The main challenge inherited from CubeSat is its capability to perform onboard inference of the ML model. Nowadays, several simple yet powerful ML algorithms for performing anomaly detection are available. This study investigates five ML algorithm candidates, considering classification score, execution time, model size, and power consumption in a constrained computational environment. The pre-processing stage introduces the windowed averaging technique besides standardization and principal component analysis. Furthermore, the paper features the background, bus system, and initial operational data of BIRDS-4, a constellation made of three 1U CubeSats released from the International Space Station in March 2021, with a ML model proposal for future satellite missions.

DOI： 10.3390/app12178634

Scopus

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Development of Innovative CubeSat Platform for Mass Production 査読有り国際誌

Areda E.E., Cordova-Alarcon J.R., Masui H., Cho M.

Applied Sciences (Switzerland) 12 ( 18 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Featured Application: The presented innovative design concept significantly impacts the development of nanosatellites such as CubeSats, particularly for mass production missions that demand high efficiency and fast delivery. With the recent increase in CubeSats’ ability to undertake complex and advanced missions, they are being considered for missions such as constellations, which demand high development efficiency. From a satellite interface perspective, productivity can be maximized by implementing a flexible modular structural platform that promotes easy reconfigurability during the integration and testing phase. Thus, the structural design of a CubeSat plays a crucial role in facilitating the satellite integration process. In most cases, the mechanical interface implemented between the primary load-supporting structure and internal satellite subassemblies affects the speed and efficiency of satellite integration by adding or reducing complexity. Most CubeSat structural designs use stacking techniques to mount PCBs onto the primary structure using stacking rods/screws. As a result, the internal subsystems are interconnected. This conventional interface method is observed to increase the number of structural parts, while increasing complexity during integration. In this study, flexible 3U and 1U CubeSat platforms are developed, based on the slot concept. This innovative mounting design provides a simple method of mounting PCBs into the slots. The concept is evaluated and verified for its feasibility for mass production applications. Count and complexity analysis is carried to evaluate the proposed design against the conventional type of structural interface methods. The assessment reveals that this new concept demonstrates a significant improvement in the efficiency of the mass production process.

DOI： 10.3390/app12189087

Scopus

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Assessing the Capacity and Coverage of Satellite IoT for Developing Countries Using a CubeSat 査読有り国際誌

Lepcha P., Malmadayalage T.D., Örger N.C., Purio M.A., Duran F., Kishimoto M., El-Megharbel H.A., Cho M.

Applied Sciences (Switzerland) 12 ( 17 ) 2022年09月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Many regions in developing countries do not have any access to communication networks even though the number of devices connected through the Internet of Things (IoT) is increasing significantly. A small satellite platform could provide global network coverage in low Earth orbit to these remote locations at a low cost. This paper describes the overall mission architecture and the implementation of remote IoT using a 1U volume in 6U CubeSat platform named KITSUNE. In KITSUNE, one of the missions is to leverage IoT for building a network of remote ground sensor terminals (GST) in 11 mostly developing countries. This paper evaluates the capacity and coverage of a satellite-based IoT network for providing remote data-collection services to these countries. The amount of data that could be collected from the GSTs and forwarded accurately to the users determines the actual capacity of the Store and Forward (S&F) mission. Therefore, there are several proposed parameters to estimate this capacity in this study. In addition, these parameters are retrieved from the simulations, ground test results, and on-orbit observations with the KITSUNE satellite. The proposed IoT system, which is composed of the GSTs and IoT subsystem onboard KITSUNE satellite, is determined to be capable of providing valuable information from remote locations. In addition, the collected data are achieved and analyzed to monitor sensory data specific to each country, and it could help to generate prediction profiles as well.

DOI： 10.3390/app12178623

Scopus

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RESULTS OF BIRDS-4 SATELLITE ON-ORBIT POWER PERFORMANCE FOR ENHANCING 1U SATELLITE POWER SYSTEM RELIABILITY 査読有り

Hari Ram Shrestha, Izrael Zenar Casople Bautista, Adolfo Javier Jara Cespedes, BIRDS-4 team, Takashi Yamauchi, Mengu Cho

73rd International Astronautical Congress (IAC) 2022年09月

Open-Sourcing of CubeSat Bus for Capacity Building aimed to Acquire Original Space Development Capability 査読有り

布施哲人,趙孟佑

29th Workshop on Space Technology for Socio-Economic Benefits 2022年09月

Reconfigurable Software Defined Radio (SDR) Transceiver with Selective Frequency Algorithm for Atmospheric Radio Sensing Measurements on Small Satellites 査読有り

Ramson M. Nyamukondiwaa*, Mengu Cho, Makiko Kishimoto

73rd International Astronautical Congress (IAC) 2022年09月

OPERA: Onboard Processing Orbit Determination by One-Way Ranging for Lunar Exploration Mission 査読有り

Makiko Kishimoto, Sangkyun Kim, Shota Kubo, Kenta Sawa, Mengu Cho

73rd International Astronautical Congress (IAC) 2022年09月

Establishing a network of ground sensor terminals (GSTs) for satellite-based global store and forward data collection mission in developing nations 査読有り

Pooja Lepcha, Tharindu Dayarathna, Necmi C. Orger, Nik A.A. Rahmat, Federico Gaona, Ever Quiñonez, Sagar Koirala, Sirash Sayanju, Yu-Sheng Liu, Barsbold Bayansan, Turtogtokh Tumenjargal, Tuguldur Ulambayar, Mengu Cho

73rd International Astronautical Congress 2022年09月

Program management for sustainable university CubeSat programs based on the experience of five generations of CubeSat projects, BIRDS program 査読有り

Mengu Cho, Mariko Teramoto, Takashi Yamauchi, George Maeda, Sangkyun Kim, Hirokazu Masui

Small Satellite Conference 2022年08月

Open-sourcing 1U CubeSat platform for Education and Capacity Building 査読有り

Mengu Cho, George Maeda, Sangkyun Kim, Takashi Yamauchi, Hirokazu Masui, Kentaro Kitamura, Juan José Rojas Hernández

CubeSat Developers Workshop 2022年04月

Performance evaluation of MgF2 coated Electron Emitting Film for preventing spacecraft charging under vacuum ultraviolet environment 査読有り

濱田大毅，趙孟佑，豊田和弘

The 16th Spacecraft Charging and Technology Conference (SCTC) 2022年04月

Earth Observation Mission of a 6U CubeSat with a 5-Meter Resolution for Wildfire Image Classification Using Convolution Neural Network Approach 査読有り国際誌

Azami M.H.B., Orger N.C., Schulz V.H., Oshiro T., Cho M.

Remote Sensing 14 ( 8 ) 2022年04月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The KITSUNE satellite is a 6-unit CubeSat platform with the main mission of 5-m-class Earth observation in low Earth orbit (LEO), and the payload is developed with a 31.4 MP commercial off-the-shelf sensor, customized optics, and a camera controller board. Even though the payload is designed for Earth observation and to capture man-made patterns on the ground as the main mission, a secondary mission is planned for the classification of wildfire images by the convolution neural network (CNN) approach. Therefore, KITSUNE will be the first CubeSat to employ CNN to classify wildfire images in LEO. In this study, a deep-learning approach is utilized onboard the satellite in order to reduce the downlink data by pre-processing instead of the traditional method of performing the image processing at the ground station. The pre-trained CNN models generated in Colab are saved in RPi CM3+, in which, an uplink command will execute the image classification algorithm and append the results on the captured image data. The on-ground testing indicated that it could achieve an overall accuracy of 98% and an F1 score of a 97% success rate in classifying the wildfire events running on the satellite system using the MiniVGGNet network. Meanwhile, the LeNet and ShallowNet models were also compared and implemented on the CubeSat with 95% and 92% F1 scores, respectively. Overall, this study demonstrated the capability of small satellites to perform CNN onboard in orbit. Finally, the KITSUNE satellite is deployed from ISS on March 2022.

DOI： 10.3390/rs14081874

Scopus

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Transparent S-band patch array antenna for a lunar mission CubeSat 査読有り

Daisuke Nakayama, Mengu Cho,

33rd International Symposium on Space Technology and Science (ISTS), 2022-f-06, Beppu, Japan, Feb-Mar. 2022 (online) 2022年03月

Attitude and Orbit Control system for a 6U CubeSat mission in low altitude lunar orbit using low-thrust propulsion system 査読有り

Jose Rodrigo Cordova Alarcon, Matteo Laterza, Necmi Cihan Orger, Tze King Lam, Kai Sheng Khoo, George-Christian Potrivitu, Jian Wei Mark Lim, Sangkyun Kim, Mengu Cho,

33rd International Symposium on Space Technology and Science (ISTS) 2022年02月

Urban Growth Impact Assessment for Urban-Heat Island and Outdoor Thermal Comfort using data fusion technique for Manila City, Philippines 査読有り

Mark Angelo Purio, Tetsunobu Yoshitake, Mengu Cho,

33rd International Symposium on Space Technology and Science (ISTS), 2022-n-13, Beppu, Japan, Feb-Mar. 2022 (online) 2022年02月

Thermal Design of 6U Satellite KITSUNE Equipped with a High-Resolution Camera 査読有り

Takashi Oshiro, Mengu Cho, Hirokazu Masui, Takashi Yamauchi, Muhammad Hasif Bin Azami, Necmi Cihan Orger, Kazuhiro Nakayama,

33rd International Symposium on Space Technology and Science (ISTS), 2022-i-07, Beppu, Japan, Feb-Mar. 2022 (online) 2022年02月

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