Space Systems Technology Research Articles

An Embedded Systems Laboratory for Aerospace Students

The UPM Master in Space Systems (MUSE) is a two-year graduate program focused on space systems technology. The program is largely project-based, with the UPMSat-2 satellite mission as a general framework to which the various course subjects are applied. The course on Data Housekeeping deals with the hardware and software aspects of the on-board computer systems in charge of data acquisition, monitoring and control within a spacecraft, with special reference to UPMSat-2, as well as the command and supervision functions of the associated ground segment. Since the real hardware used on the satellite is expensive and thus not amenable to use in laboratory work, except in very limited situations, a simplified engineering model of it has been developed by the authors. The model is based on a cheap, reduced size microcomputer board kit that can be easily acquired and taken home by the students in order to carry out the laboratory assignments and supplementary work as needed. The hardware and software components of the laboratory kit, its use in the course, and its impact on the students performance, are described in the paper.

有人宇宙システム「安全な高信頼性システムを目指して」 : スペースシャトル・コロンビア事故の悲劇に学ぶ(特集 宇宙開発における信頼性)

有人宇宙システム「安全な高信頼性システムを目指して」 : スペースシャトル・コロンビア事故の悲劇に学ぶ(特集 宇宙開発における信頼性)

軌道上人工衛星の不具合事例と信頼性向上対策(特集 宇宙開発における信頼性)

軌道上人工衛星の不具合事例と信頼性向上対策(特集 宇宙開発における信頼性)

S1920105 ほどよし3-4号機の開発と軌道上運用から得られた実践的な知見とその応用

Since June 2011 to end of March 2014, The University of Tokyo and The Next Generation Space system Technology Research Association had been developing the twin micro-satellite: Hodoyoshi-3 and -4 to demonstrate and establish an innovative system design and a cost-effective development process for mass-production of micro-satellites in the future based on the new concept called "Hodoyoshi" which means reasonably reliable. These two satellites were successfully launched into Sun Synchronous Orbit with an altitude of about 630km on June 19th 2014. So far, we have been getting achievements regarding system performance on-orbit, a lot of mission data, for example, Earth observation images and movies, technical demonstration by new devices, capabilities for new space utilization like space advertisement. In this project, we have been considering and demonstrating, system architecture design methods, integration and test process, on-orbit operation methods including recovery functions from anomaly. This evaluation is undergoing by reviewing operation results from viewpoints of Hodoyoshi concept. This paper descries the Hodoyoshi concept, the major characteristics of the satellites, and the key features and approaches of microsatellite development to realize cost-effective mission.

E02 共通超小型衛星バスの粗三軸制御安定性能の軌道上評価及び比較(宇宙システム・衛星技術)

This paper shows the design concept and the preliminary report for the low-accuracy three-axis stabilization results of the newly developed standard micro satellite system. The standard bus system is developed by the University of Tokyo and NESTRA (next generation space system technology research association) supported by the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program). The satellite system tries to be straightforward to achieve cost-effective and short development period. The standard satellite systems are used as the bus system of three satellites launched in 2014, which are UNIFORM-1, HODOYOSHI-3, and HODOYOSHI-4. All of them have been achieved the low-accuracy three-axis stabilization, by dealing with the unexpected problems with the use of the modified operational plans. This paper also performs the comparison of the on-orbit results of three satellites and discusses the design feasibilities of the proposed bus system.

Risk management in space systems design and technology development

Over the past two decades, risk management and risk analysis have emerged throughout the business community in the USA as prominent planning and development strategies used to mitigate risk of failure and to ensure a high return on investment for business endeavours (financial and otherwise). They are generic tools that can be applied to any business regardless of the sector (i.e. government, university, and private) and have been used by the Federal Government in the form of institutional practices aimed at maximizing the probability of success in business activities. One US Federal agency that incorporates risk management and analysis techniques into business and/or engineering activities is the National Aeronautics and Space Administration. The present work is a discussion on mission, spacecraft and instrument design (as well as technology development), and the role of risk management, analysis, and mitigation as fundamental tools in the design process.

宇宙開発における信頼性管理要求の変還(特集 宇宙開発における信頼性)

宇宙開発における信頼性管理要求の変還(特集 宇宙開発における信頼性)

To the Special Issue on Space System Technology

To the Special Issue on Space System Technology

Activities for Reliability of Launch Vehicle(<Special Survey>Reliability in Space System Technology)

Activities for Reliability of Launch Vehicle(<Special Survey>Reliability in Space System Technology)

Advanced space system concepts and technologies: 2010-2030+

The book presents an imaginative view of what space could well become in the next several decades if new technologies are developed and bold new innovative applications are undertaken. It discusses the following concepts: a future environment for space activities very different from the predominant conditions of the past and present; a dozen critical technologies with the potential for making orders-of-magnitude reductions in spacecraft and launch vehicle weight and cost and orders-of-magnitude increases in their performance; and a large number of space applications that use these technologies to address both established as well as unconventional missions and functions that have revolutionary potential.

Advanced microelectronics technologies for future small satellite systems

Future small satellite systems for both Earth observation as well as deep-space exploration are greatly enabled by the technological advances in deep sub-micron microelectronics technologies. Whereas these technological advances are being fueled by the commercial (non-space) industries, more recently there has been an exciting new synergism evolving between the two otherwise disjoint markets. In other words, both the commercial and space industries are enabled by advances in low-power, highly integrated, miniaturized (low-volume), lightweight, and reliable real-time embedded systems. Recent announcements by commercial semiconductor manufacturers to introduce Silicon On Insulator (SOI) technology into their commercial product lines is driven by the need for high-performance low-power integrated devices. Moreover, SOI has been the technology of choice for many space semiconductor manufacturers where radiation requirements are critical. This technology has inherent radiation latch-up immunity built into the process, which makes it very attractive to space applications. In this paper, we describe the advanced microelectronics and avionics technologies under development by NASA's Deep Space Systems Technology Program (also known as X2000). These technologies are of significant benefit to both the commercial satellite as well as the deep-space and Earth orbiting science missions. Such a synergistic technology roadmap may truly enable quick turn-around, low-cost, and highly capable small satellite systems for both Earth observation as well as deep-space missions.

有人宇宙システムの開発動向 第３回有人宇宙飛行技術シンポジウム報告

有人宇宙システムの開発動向 第３回有人宇宙飛行技術シンポジウム報告