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This main purpose of this project is to prepare a fully-operational Satellite Ground Station. Moreover, it also pursues to give a remote control capability to it. This has been done by designing and building two major blocks: the Hardware system and the Software system. In order to actually test the solution, the thesis participated in a real space mission by the hand of OpenCosmos Ltd. It was known that qb01, which is OpenCosmos first cubesat, will be launched during the development of this thesis. That is why, the ground station selected qb01 as its design point, while constantly trying to generate a solution as general as possible to any satellite. Therefore, a UHF band, half-duplex SDR based system for LEO satellites was designed. Finally, the system was verified by being used in real operations by the satellite operators.
"This thesis describes the design and construction of a satellite ground station constructed in support of the Citizen Explorer Program. The University of Alaska Fairbanks was chosen to participate in this program due to its latitude that gives it excellent access to polar-orbiting satellites. The advantage that higher latitudes have in accessing low earth orbiting satellites is examined. It is demonstrated that Fairbanks, Alaska, has roughly twice the access to polar orbiting satellites than the mid-latitudes of the contiguous US. Link budgets for the communication system were developed, which led to the construction of helical antennas to communicate with the satellite. Data are presented that demonstrate the antennas, as well as the rest of the satellite tracking system, functioned acceptably. The satellite ground station will provide internet access to the spacecraft. The procedure used to test this approach and its results are given, as well as recommendations for future work"--Leaf iii.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
This book focuses on the multi-beam phased array antenna as a satellite ground station. As there are already many excellent books on phased array antennas in the literature, this book focuses mainly on some engineering practices and fills the gap between principles and practices, such as array excitation error impact analysis and calibration methods, array geometry design for hemispherical coverage, multiple beam resource management, etc. This book is particularly suitable for readers interested in satellite constellation design or satellite ground station design. This book also benefits researchers and engineers in the fields of phased array antennas, aerospace engineering, telecommunications, etc.
The space industry is currently at a significant inflection point. New economies are forming in low- Earth orbit (LEO), driven by miniaturization of technologies and the promise of lower launch costs, which should then allow many of these LEO systems to capitalize on designs incorporating smaller, shorter-lived spacecraft in highly-disaggregated constellations. Meanwhile, many spacecraft at geosynchronous orbit are continuing along a trend towards increasingly massive and longer-lasting satellites, and while they do represent some of the most exquisite, highest-performing satellites ever launched, some experts now feel that such trends are unsustainable and are beginning to place increasing strain on the underlying industry. To support current and future spacecraft, orbital infrastructures have been proposed as a means of providing on-orbit services to customer spacecraft and guiding space architectures towards more sustainable paradigms. In LEO, an infrastructure of communications and data relay spacecraft is envisioned as a means of aiding new and existing space enterprises in the areas of satellite connectivity and downlink capability. Meanwhile, an on-orbit servicing (OOS) infrastructure, located primarily in geosynchronous orbit, would provide services such as repair, rescue, refueling, and upgrading of customer spacecraft, in order to alleviate the identified space industry trends. Physics and cost modeling, as well as tradespace exploration, are used to identify optimal LEO infrastructure designs, while system dynamics modeling is used to assess the trends likely to occur in the overall space industry as OOS is incorporated into space architectures. The primary conclusion from the analysis of LEO infrastructure designs is that, when designing for global connectivity, there is an optimal design point between a small constellation of larger spacecraft and a very large constellation of small spacecraft, but this will also depend on the intended mission of the infrastructure and the number of customers expecting to be serviced. Then, for an OOS infrastructure, it is determined that relatively low costs and heavy incorporation of servicing capabilities into customer architectures are needed to ensure long-term sustainability of such a project. Finally, the policy implications for both infrastructure concepts are discussed, with a heavy focus on options for the funding and development regimes employed to implement the infrastructures, as well as the major political and legal implications expected to accompany these projects.
This thesis discusses the design of subsystems for a representative modern low Earth Orbit (LEO) satellite. Specifically, the subsystems presented were designed for inclusion on DebriSat, a 50 kg satellite intended to be representative of modern LEO satellites ranging from 1-5000 kg terms of its components, materials used, and fabrication procedures. A LEO satellite survey was conducted that utilized the Union of Concerned Scientists (UCS) satellite database, with selected satellites emphasizing those launched after 1990 and next-generation satellites expected to launch in the near future. Specifically, fifty U.S. and European satellites were studied in detail to determine appropriate subsystems and components for use in a representative modern LEO satellite. As a result of this study and further consultation with subject-matter experts, particular components and subsystems were down selected for inclusion in the DebriSat design (e.g. sun sensors and reaction wheels are implemented rather than horizon sensors and passive magnetics due to their prevalence on the satellites surveyed). After these components were determined, they were integrated into complete subsystem designs. Finally, this thesis details how these representative components and subsystems are to be fabricated. Due to the prohibitively high costs of flight hardware, donated and rejected flight units are used in some instances, while non-functional emulations are used in others. DebriSat is a collaborative effort with NASA Orbital Debris Programs Office, the USAF Space and Missile Systems Center, and The Aerospace Corporation.
In recent decades, the number of satellites being built and launched into Earth’s orbit has grown immensely, alongside the field of space engineering itself. This book offers an in-depth guide to engineers and professionals seeking to understand the technologies behind Low Earth Orbit satellites. With access to special spreadsheets that provide the key equations and relationships needed for mastering spacecraft design, this book gives the growing crop of space engineers and professionals the tools and resources they need to prepare their own LEO satellite designs, which is especially useful for designers of small satellites such as those launched by universities. Each chapter breaks down the various mathematics and principles underlying current spacecraft software and hardware designs.
It is a great pleasure to share with you the Springer CCIS 111 proceedings of the Third World Summit on the Knowledge Society––WSKS 2010––that was organized by the International Scientific Council for the Knowledge Society, and supported by the Open Research Society, NGO, (http://www.open-knowledge-society.org) and the Int- national Journal of the Knowledge Society Research, (http://www.igi-global.com/ijksr), and took place in Aquis Corfu Holiday Palace Hotel, on Corfu island, Greece, September 22–24, 2010. The Third World Summit on the Knowledge Society (WSKS 2010) was an inter- tional scientific event devoted to promoting the dialogue on the main aspects of the knowledge society towards a better world for all. The multidimensional economic and social crisis of the last couple years brings to the fore the need to discuss in depth new policies and strategies for a human-centric developmental process in the global c- text. This annual summit brings together key stakeholders of knowledge society dev- opment worldwide, from academia, industry, government, policy makers, and active citizens to look at the impact and prospects of it information technology, and the knowledge-based era it is creating, on key facets of living, working, learning, innovating, and collaborating in today’s hyper-complex world.