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From Cubesats To Constellations
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Book Synopsis From CubeSats to Constellations by : Anne Dorothy Marinan
Download or read book From CubeSats to Constellations written by Anne Dorothy Marinan and published by . This book was released on 2013 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of an Earth observing spacecraft constellation is to obtain global measurements with improved spatial and temporal resolution. The small size, low cost, standardized form factor, and increasing availability of commercial parts for CubeSats make them ideal for use in constellations. In this work, we provide an in-depth analysis of how to evolve from a single Earth-observing CubeSat to an effective CubeSat constellation. We first consider pointing capability provided by three different CubeSat attitude determination and control system (ADCS) architectures to an Earth-observing payload. Our approach of performing a comprehensive orbital altitude and inclination reference point analysis for all subsystems allows us not only to evaluate trades between subsystems when designing a CubeSat that may be manifest in any low-Earth orbit, but the reference point analysis also provides a database of impacts that the orbital parameters have on subsystems and performance for designing a constellation. Next, we consider the practical challenge of trying to launch and distribute a CubeSat constellation into a specific configuration. We suggest a cost-effective way to launch a constellation of CubeSats via consecutive secondary payload launch opportunities.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309442664 Total Pages :131 pages Book Rating :4.3/5 (94 download)
Book Synopsis Achieving Science with CubeSats by : National Academies of Sciences, Engineering, and Medicine
Download or read book Achieving Science with CubeSats written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-10-06 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space-based observations have transformed our understanding of Earth, its environment, the solar system and the universe at large. During past decades, driven by increasingly advanced science questions, space observatories have become more sophisticated and more complex, with costs often growing to billions of dollars. Although these kinds of ever-more-sophisticated missions will continue into the future, small satellites, ranging in mass between 500 kg to 0.1 kg, are gaining momentum as an additional means to address targeted science questions in a rapid, and possibly more affordable, manner. Within the category of small satellites, CubeSats have emerged as a space-platform defined in terms of (10 cm x 10 cm x 10 cm)- sized cubic units of approximately 1.3 kg each called "U's." Historically, CubeSats were developed as training projects to expose students to the challenges of real-world engineering practices and system design. Yet, their use has rapidly spread within academia, industry, and government agencies both nationally and internationally. In particular, CubeSats have caught the attention of parts of the U.S. space science community, which sees this platform, despite its inherent constraints, as a way to affordably access space and perform unique measurements of scientific value. The first science results from such CubeSats have only recently become available; however, questions remain regarding the scientific potential and technological promise of CubeSats in the future. Achieving Science with CubeSats reviews the current state of the scientific potential and technological promise of CubeSats. This report focuses on the platform's promise to obtain high- priority science data, as defined in recent decadal surveys in astronomy and astrophysics, Earth science and applications from space, planetary science, and solar and space physics (heliophysics); the science priorities identified in the 2014 NASA Science Plan; and the potential for CubeSats to advance biology and microgravity research. It provides a list of sample science goals for CubeSats, many of which address targeted science, often in coordination with other spacecraft, or use "sacrificial," or high-risk, orbits that lead to the demise of the satellite after critical data have been collected. Other goals relate to the use of CubeSats as constellations or swarms deploying tens to hundreds of CubeSats that function as one distributed array of measurements.
Book Synopsis CubeSat Constellation Implementation and Management Using Differential Drag by : Zachary Thomas Lee
Download or read book CubeSat Constellation Implementation and Management Using Differential Drag written by Zachary Thomas Lee and published by . This book was released on 2017 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space missions often require the use of several satellites working in coordination with each other. Industry examples include Planet, which is working to develop a constellation of over 100 Cube Satellites (CubeSats) to obtain global imagery data daily, and Astro Digital, which seeks to implement a constellation of multispectral imaging satellites to image the entire Earth every three to four days [1, 2]. CubeSat constellations are also being considered for applications such as secure laser communication relays and for weather sensing with short revisit times [3, 4]. Such missions require several CubeSats with regular spacing within an orbital plane to achieve their objectives. However, an appropriately arranged constellation can be particularly difficult to implement for CubeSats. Cold gas propulsion systems with the ability to provide tens of meters per second of delta-V (for a 3U CubeSat) exist and can be used for constellation management on timescales of weeks [5, 6, 7, 8, 9]. Monopropellant systems also currently exist for CubeSats, but, like cold gas systems, they can require significant power, mass, volume, and thermal management resources, and they also carry more risk [9, 10]. Launch services providers often limit acceptance of pressurized vessels, which can limit launch opportunities for CubeSats with cold gas or monopropellant propulsion systems. Although electric propulsion systems can provide up to 100 m/s delta-V for a 3U CubeSat, they also have mass, volume, cost, and power impacts, and they typically require timescales on the order of weeks to months to cause significant changes [6, 11, 9]. In low Earth orbit, there is sufficient drag to perturb satellite orbits. Though it varies widely based on conditions, at 500 kilometer (km) altitude, the acceleration due to drag on a 3U CubeSat can be around 15 [mu]m/s2 per unit area [12]. Over time, this is enough acceleration to change a satellite's orbit. By controlling the attitude of a satellite, the profile area can be changed. By manipulating the profile area, the drag force can be changed, and satellites can be moved relative to each other within an orbital plane. Using differential drag at 550 km altitude, a 3U CubeSat can.move its true anomaly 180 degrees relative to another in the same orbital plane in about 100 days. Previous work with differential drag for constellation management has focused on linearized control schemes for formation flight. However, the linearized equations used for close-proximity flight are not valid for maximum-separation missions [13, 14, 15]. While some work does exist on maximum-separation missions, conditions are simplified or details on the estimation and control scheme are omitted or inadequate [8, 16, 17, 18, 19]. This work uses an unscented Kalman filter to estimate mean orbital elements and a novel control scheme to first offset and then match relative mean semi-major axes. The separation of mean semi-major axes creates different mean motions such that allow for the relative mean anomalies to be controlled. Simulation results demonstrate that differential drag can be used to control and maintain satellites within 0.5 degrees of the desired mean anomaly relative to other satellites. For two satellites in the same orbital plane at 500 km altitude seeking to maximize separation, 0.5 degrees corresponds to an angle that can be traversed in under 10 seconds. For Earth observation mission, this has a negligible effect on revisit times and can be considered an acceptable result.
Book Synopsis A Systems Analysis of CubeSat Constellations with Distributed Sensors by : Ayesha Georgina Iwalanai Hein
Download or read book A Systems Analysis of CubeSat Constellations with Distributed Sensors written by Ayesha Georgina Iwalanai Hein and published by . This book was released on 2017 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores the use of CubeSat constellations as "gap fillers" and supplements to traditionally complex, multi-sensored satellites, increasing resiliency of the system at very low cost. In standard satellite acquisitions, satellites can take years and billions of dollars to reach operational status. Should there be delays in schedule or on-orbit failures, gaps in data integral to US operations can be lost. CubeSats present a low cost temporary solution. In this thesis, the weather sensing satellite, JPSS-1, is used as a reference case for a traditional multi-sensored satellite. The sensors from JPSS-1 are paired with state-of-the-art CubeSat sensors of similar functions. These CubeSats are used to make up three different constellation architectures which are examined for the revisit times and coverage they offer. These architectures are based on some of the common methods of launching and implementing a CubeSat constellation, a single mass launch, a series of available launches, and a planned configuration. This analysis shows that in some areas, like radiometry, CubeSat sensors are comparable with operational heritage sensors. In the other cases, like optical imaging and hyperspectral imagers, CubeSats have not yet advanced enough or cannot be advanced much more based on the limitations of their size and power. A practical use of a CubeSat constellation is to supplement and augment a traditional system, increasing the overall redundancy and providing data over larger geographic regions and with lower revisit times for a approximately 4.5% of the cost of a traditional satellite.
Book Synopsis Next Generation CubeSats and SmallSats by : Francesco Branz
Download or read book Next Generation CubeSats and SmallSats written by Francesco Branz and published by Elsevier. This book was released on 2023-08-24 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt: Next Generation of CubeSats and SmallSats: Enabling Technologies, Missions, and Markets provides a comprehensive understanding of the small and medium sized satellite approach and its potentialities and limitations. The book analyzes promising applications (e.g., constellations and distributed systems, small science platforms that overachieve relative to their development time and cost) as paradigm-shifting solutions for space exploitation, with an analysis of market statistics and trends and a prediction of where the technologies, and consequently, the field is heading in the next decade. The book also provides a thorough analysis of CubeSat potentialities and applications, and addresses unique technical approaches and systems strategies. Throughout key sections (introduction and background, technology details, systems, applications, and future prospects), the book provides basic design tools scaled to the small satellite problem, assesses the technological state-of-the-art, and describes the most recent advancements with a look to the near future. This new book is for aerospace engineering professionals, advanced students, and designers seeking a broad view of the CubeSat world with a brief historical background, strategies, applications, mission scenarios, new challenges and upcoming advances. - Presents a comprehensive and systematic view of the technologies and space missions related to nanosats and smallsats - Discusses next generation technologies, up-coming advancements and future perspectives - Features the most relevant CubeSat launch initiatives from NASA, ESA, and from developing countries, along with an overview of the New Space CubeSat market
Book Synopsis Cubesat Constellations, Clusters, and Swarms by : Patrick Stakem
Download or read book Cubesat Constellations, Clusters, and Swarms written by Patrick Stakem and published by . This book was released on 2017-03-05 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the application of Cubesat Clusters, Constellations, and Swarms in the exploration of the solar systems. This includes the Sun, the 8 primary planets and Pluto, many moon, the asteroid belt, comets, the ring systems of the four gas giants, and comets. There is a lot to explore. U.S. Spacecraft have been to all of the planets in the solar system. Although the planets (and Pluto) have been visited by spacecraft, Earth's moon has been somewhat explored, and many of the other planets' moons have been imaged, there is a lot of "filling in the blanks" to be done. Here we explore the application of groups of small independent spacecraft to take on this role. Some of the enabling technology for cooperating swarms is examined. Missions to Mars and beyond are lengthy and expensive. We need to ensure that we are delivering payloads that will function and return new data. The tradeoff is between one or two large traditional spacecraft, and a new concept, a large number of nearly identical small spacecraft, operating cooperatively. Necessarily, the Technology Readiness Level of this approach must be proven in Earth orbit, before the resources are allocated to extend this approach to distant locations. Decades of time, and hundreds of millions of dollars are at stake. The big picture is, Cubesats are not just secondary payloads anymore, They may be small, but a lot of them together can accomplish a lot. We'll discuss the technologies to make this happen.
Book Synopsis CubeSat Handbook by : Chantal Cappelletti
Download or read book CubeSat Handbook written by Chantal Cappelletti and published by Academic Press. This book was released on 2020-09-25 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: CubeSat Handbook: From Mission Design to Operations is the first book solely devoted to the design, manufacturing, and in-orbit operations of CubeSats. Beginning with an historical overview from CubeSat co-inventors Robert Twiggs and Jordi Puig-Suari, the book is divided into 6 parts with contributions from international experts in the area of small satellites and CubeSats. It covers topics such as standard interfaces, on-board & ground software, industry standards in terms of control algorithms and sub-systems, systems engineering, standards for AITV (assembly, integration, testing and validation) activities, and launch regulations. This comprehensive resource provides all the information needed for engineers and developers in industry and academia to successfully design and launch a CubeSat mission. - Provides an overview on all aspects that a CubeSat developer needs to analyze during mission design and its realization - Features practical examples on how to design and deal with possible issues during a CubeSat mission - Covers new developments and technologies, including ThinSats and PocketQubeSats
Book Synopsis Innovative Design, Manufacturing and Testing of Small Satellites by : Scott Madry
Download or read book Innovative Design, Manufacturing and Testing of Small Satellites written by Scott Madry and published by Springer. This book was released on 2018-05-12 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details key trends involving the recent formation of scores of companies that build and launch small satellites or provide key components for small satellite constellations. The applications and usage are quite diverse and include student experiments, serious scientific experimentation, and totally new types of commercial constellations, particularly in telecommunications and remote sensing. The explosive growth in the design, manufacturing, and launch of small satellites is one of the most dynamic aspects in the area of space exploration and exploitation today. New commercial space companies such as Planet Labs, Sky Box, OneWeb, and LeoSat are now building and launching thousands of small satellites and cubesats into orbit. Small companies and big aerospace companies alike are getting into this exciting and interesting new business. This is a practical guide that provides advice to students, researchers, LEO satellite companies, and regulators wrestling with some of the new challenges that small satellites present as more and more companies and countries around the world enter the new small satellite arena.
Book Synopsis Resource Optimization Algorithms for an Automated Coordinated CubeSat Constellation by : Andrew Kitrell Kennedy
Download or read book Resource Optimization Algorithms for an Automated Coordinated CubeSat Constellation written by Andrew Kitrell Kennedy and published by . This book was released on 2015 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present and analyze the performance of two algorithms that plan and coordinate activities for a resource-constrained Earth-observing CubeSat constellation. The first algorithm is the Resource-Aware SmallSat Planner (RASP), which performs low-level planning of observation and communication activities for a single satellite while simultaneously keeping the satellite's onboard resources within specified bounds. RASP utilizes a Mixed Integer Linear Program based formulation and Depth First Search for construction of consistent onboard activity timelines. The second algorithm is the Limited Communication Constellation Coordinator (LCCC), which performs high level coordination of observations across the constellation through a distributed, "weak" consensus mechanism. The performance of the algorithms is tested with a 24 hour simulation of an eighteen satellite constellation over multiple orbital geometries and inter-satellite communication contexts. The orbital geometries include a modified Walker Star constellation and an "ad hoc" constellation defined by historical launches of CubeSats. The multiple communication contexts simulate different methods for sharing observation planning information between the satellites, and include sharing through inter-satellite crosslinks, downlink and uplink to ground stations, connection to a commercial communications constellation, and no sharing at all. Five analyses of the algorithms' performance were conducted, including average revisit times achieved, the numbers of communications links executed, how effectively planning information was shared, the resource margins maintained by the satellites, and the average execution time for the planner. Information sharing significantly aided in balancing revisit times across multiple Earth regions and three sensor choices, reducing the disparity in average revisit times between sensors from 514 minutes to 10 minutes for the Walker case and 617 to 11 minutes for he Ad Hoc case. Significantly more crosslink opportunities were available on average for the Walker satellites than for Ad Hoc (89.2 versus 47.7) and more crosslinks were executed for the Walker case (30.3 versus 20.8). Crosslink was found to be less effective than downlink at sharing planning information across the constellation, with a lower average latency (186 minutes versus 434, Walker) and better average initial timeliness (-35 minutes versus -287, Walker). Information sharing through both a commercial constellation and downlink outperformed sharing through just downlink or just crosslink, with an average latency and initial timeliness of 77 and 74 minutes (Walker). Average data storage and energy storage margins were kept high, as desired, for both constellations, at around 85 and 70 %. RASP planning time was found to scale roughly with the square of planning window length, but stays under a minute in all cases tested (achieving a maximum of 37.71 seconds).
Book Synopsis Contributions to the advance of the integration density of CubeSats by : Grau, Sebastian
Download or read book Contributions to the advance of the integration density of CubeSats written by Grau, Sebastian and published by Universitätsverlag der TU Berlin. This book was released on 2019-09-17 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates potential technologies to increase the integration density of CubeSats. Observations of the CubeSat market and missions are recorded in order to derive design criteria for high performance single unit CubeSats. A promising approach to increased integration density is relocation of the components of multiple satellite subsystems to form a highly integrated, multi-functional solar panel. Eligible components are usually allocated to the communication system, the electric power system, or the attitude determination and control system. In a joint research project, development, optimization, and miniaturization of those components in order to form a highly integrated, multi-functional solar panel is investigated. The author first summarizes the development work of the project partners for a picosatellite solar antenna and puts it into relation to the overall solar panel design. Advantage of using solar antennas over simple patch antennas is the reduced loss of solar cell area, and hence available electric power, that is usually accompanied by the usage of higher frequency bands for broadband payload data transmission. Magnetic attitude actuators are the backbone of CubeSat attitude control. In order to increase their performance and lower their resource consumption, numerical optimization of the commonly used three coil types is investigated by the author. This leads to the formulation of a novel optimization approach, which is better suited to real-world considerations for magnetic actuator design. Results from the application of the optimization procedure show potential for every coil type. The state of the art of a novel type of attitude control actuators, so-called fluid-dynamic actuators which are based on angular momentum exchange, is advanced by the author by introducing miniaturized 3D-printed conduits for single unit CubeSat applications. Following development and functional verification, actuators are compared to existing reaction wheel systems, which shows their superiority for agile attitude maneuvers and integration with the satellite bus. Further investigation exploits additive manufacturing technologies to create redundancy concepts using four actuators with three-dimensional conduits.Finally, development, optimization, and miniaturization of subsystem components is brought together in the design, assembly, and test of a highly integrated, multi-functional solar panel. Analysis of a single unit CubeSat design that applies different configurations of the multi-functional solar panel shows the potential for more than 50% payload mass and payload volume. This brings integration density of single unit CubeSats to a level similar to that of the larger triple unit form factors currently employed for the New Space mega-constellations. Diese Dissertation untersucht mögliche Technologien zur Erhöhung der Integrationsdichte von CubeSats. Beobachtungen des CubeSat-Marktes und ausgewählter Missionen werden zusammengetragen um Entwurfskriterien für hochperformante 1U CubeSats abzuleiten. Ein vielversprechender Ansatz zur Erhöhung der Integrationsdichte ist der Umzug von Komponenten verschiedener Satellitensubsysteme auf ein zu entwickelndes hochintegriertes, multifunktionales Solarpaneel. Infrage kommende Komponenten sind für gewöhnlich dem Kommunikationssystem, dem Energieversorgungssystem, oder dem Lageregelungssystem zugeordnet. In Rahmen eines gemeinschaftlichen Forschungsvorhabens wurden Entwicklung, Optimierung, und Miniaturisierung ausgewählter Komponenten eines solchen hochintegrierten, multifunktionalen Paneels untersucht. Durch den Autor wird zunächst die Entwicklung einer Solarantenne für Pikosatelliten durch den Projektpartner zusammengefasst und in Zusammenhang um Entwurf des Solarpaneels gebracht. Der Vorteil einer Solarantenne gegenüber einer einfachen Patch-Antenne ist der geringere Verlust an Solarzellenfläche, und damit zur Verfügung stehender elektrischer Leistung, der üblicherweise mit der Verwendung höherer Frequenzbänder zur breitbandigen Nutzlastdatenübertragung einhergeht. Magnetische Lageregelungsaktuatoren bilden das Rückgrat der CubeSat-Lageregelung. Um deren Leistungsfähigkeit zu erhöhen und den Ressourcenverbrauch zu verringern, wird durch den Autor die numerische Optimierung der drei gebräuchlichen Spulentypen untersucht. Dies führt zur Formulierung eines neuartigen Optimierungsansatzes welcher besser für die Anwendung realer Entwurfsprobleme geeignet ist. Die Optimierungsergebnisse zeigen ein großes Potential für die Optimierung aller betrachteter Spulentypen auf. Der Stand der Technik im Bereich neuartiger Lageregelungsaktuatoren, den sogenannten fluiddynamischen Aktuatoren die auf Drehimpulsaustausch basieren, wird durch den Autor durch die Einführung miniaturisierter 3D-gedruckter Kanäle für die Verwendung auf 1U CubeSats vorangebracht. Im Anschluss an die Entwicklung und funktionale Verifikation werden diese Aktuatoren mit existierenden Reaktionsradsystemen verglichen, was deren Überlegenheit bei agilen Lageregelungsmanövern und der Integration in den Satellitenbus aufzeigt. Weitere Untersuchungen nutzen die additiven Herstellungsverfahren zur Darstellung von redundanten Konzepten bestehend aus vier Aktuatoren mit dreidimensionalen Kanalgeometrien. Abschließend werden Entwicklung, Optimierung und Miniaturisierung der Subsystemkomponenten im Entwurf, Aufbau und Test eines hochintegrierten, multifunktionalen Seitenwandpaneels zusammengeführt. Die Analyse eines 1U CubeSat-Entwurfs unter Verwendung verschiedener Konfigurationen des multifunktionalen Solarpaneels zeigt ein Potential für jeweils mehr als 50% verfügbarer Nutzlastmasse und Nutzlastvolumen vom gesamten Satelliten. Dies hebt die Integrationsdichte von 1U CubeSats auf ein ähnliches Niveau der 3U Formfaktoren, welche gegenwärtig bei den New Space Megakonstellationen zur Anwendung kommen.
Book Synopsis Legal Aspects Around Satellite Constellations by : Annette Froehlich
Download or read book Legal Aspects Around Satellite Constellations written by Annette Froehlich and published by Springer. This book was released on 2019-03-18 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on an initiative made by the European Space Policy Institute, the European Centre for Space Law and the German Aerospace Center. Students and young professionals worlwide were invited to submit a paper on this topic analyzing and discussing relevant aspects on either environment, economy, security, licencing, or control. The best papers have been included in this volume.
Book Synopsis Mission Design of a CubeSat Constellation for In-situ Monitoring Applications by : Kanyisa Sipho Mtshemla
Download or read book Mission Design of a CubeSat Constellation for In-situ Monitoring Applications written by Kanyisa Sipho Mtshemla and published by . This book was released on 2017 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Antenna Design for CubeSats by : Reyhan Baktur
Download or read book Antenna Design for CubeSats written by Reyhan Baktur and published by Artech House Publishers. This book was released on 2021-12-31 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: A CubeSat is a miniaturized modular satellite that can be constructed from off-the-shelf components. With advancements in digital signal processing, power electronics, and packaging technology, it is feasible to fit science instruments and communication devices that were traditionally carried on larger satellites on CubeSat consolations. This not only reduces mission cost, repair, risk, but also provides more precise and real-time science data. Their low cost and versatility allow for CubeSats to be used to test technologies that are planned to use on larger satellites, to collect point-to-point data in space when launched as CubeSat constellations, or to monitor health of larger spacecrafts. This comprehensive reference explores CubeSat standards, launching methods, and detailed design guidelines for antennas specially made for CubeSat applications. Deployed CubeSat antennas, such as low gain antennas, high gain wire-based antennas, and horn and dish antennas as they relate to the technology are explored. Conformal CubeSat Antennas, including those that are independent of CubeSats and those integrated in CubeSat solar panels, are discussed. An antenna design guideline is provided to demonstrate the basics of a CubeSat link budget, which is transitionally published in signal and system community. Written by an expert in the field, this book enables readers to read antenna specifics when choosing communication front-end.
Book Synopsis CubeSat Constellation Design for Intersatellite Linking by : Michael Thomas White
Download or read book CubeSat Constellation Design for Intersatellite Linking written by Michael Thomas White and published by . This book was released on 2019 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Once the attitude of the satellites is determined, a controller can be implemented; assuming the system is controllable and observable. These parameters are verified by adding enough actuators and sensors, respectively.
Book Synopsis Nanosatellites and Applications to Commercial and Scientific Missions by : Adriano Camps
Download or read book Nanosatellites and Applications to Commercial and Scientific Missions written by Adriano Camps and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past two decades, a silent revolution has taken place in the space domain, leading to what today is known as ,ÄúNew Space.,Äù We have passed from a selected group of countries, space agencies, and big industries building, launching, and operating satellites and other spacecrafts, of a scenario in which many universities and research institutes can do it. The key of this was the definition of the ,ÄúCubeSat,Äù standard, back to 1999. In 2013, it all took off on the commercial Earth Observation sector with the first launches from two companies that are now running 100+ CubeSat constellations for optical imaging or weather prediction, with very low revisit times. Today, the same revolution is taking place in the fields of Telecommunications, and Astronomical Scientific missions. In this chapter, the evolution of the space sector is briefly revised until the arrival of the CubeSats. Then, the CubeSat intrinsic limitations are discussed as they are key to understand the development and current situation of the CubeSat sector. NASA and ESA strategies are also presented. The chapter concludes with a summary of the technology roadmap to enable the next generation of CubeSat-based missions, including satellite constellations or federations, formation flying, synthetic apertures,Ķ
Book Synopsis Bound for the Stars by : Saul J. Adelman
Download or read book Bound for the Stars written by Saul J. Adelman and published by Prentice Hall. This book was released on 1981 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mission Scheduling and Optimization Algortihm For Small Satellite Constellations by : Breannon Elizabeth Lewis
Download or read book Mission Scheduling and Optimization Algortihm For Small Satellite Constellations written by Breannon Elizabeth Lewis and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: CubeSats, a class of small satellite, offer a unique opportunity for training, technology demonstrations, Earth observation, and other space-based research. There has been a recent increase in their design and implementation in private industry. Private industries and agencies have begun to research and implement larger amounts of small satellites working together, referred to as a constellation. CubeSat Constellation missions use multiple satellites to complete complex and challenging tasks instead of one larger satellite. One of the keys to mission success for CubeSat constellation missions is mission scheduling. When implementing a large network of satellites in constellation operation, scheduling becomes a challenge due to the large amount of conflicts that need to be resolved. Conflicts occur when more than one satellite and/or ground resource can be used to complete a task. The following thesis describes and demonstrates an advanced mission scheduling algorithm to schedule Earth observation, data transfer, or relief aid missions. Each type of mission is given a test case and results show the algorithms weighted-sum flexibility to solve multiple mission objectives. The weighted-sums optimization algorithm is used to test if the effectiveness of the chosen design variables (transfer time, age of data, spatial coverage, and temporal coverage) and to test if the blended objective functions are effective. This thesis presents the preliminary results of the mission scheduling and selection of ideal weighting of different objectives for CubeSat constellation missions.
