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Author: Charlie Rose
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
The question of whether a beacon tracker, similar to the NRL Rad-Hard Star Tracker, can be successfully used in a Landmark Tracking AutoNav application rests squarely on the accuracies required, the number of beacons available, and their optical characteristics as well as distribution over the surface of the Earth. Basically, we have found that a star tracker can be used in a landmark approach, but only within some rather severe constraints: (1) Beacons can be distributed more-or-less uniformly over the Earth. Restriction to the United States does not seem feasible; (2) Position errors of several kilometers can be tolerated between updates; (3) A very sophisticated orbit propagator is built into the system. There are non-trivial problems associated with this approach to the problem. Most of them stem from the fact that the tracker would be used in a way for which is was not designed nor intended. (1) The beacons 'twinkle'; (2) The light from the beacons is refracted by the atmosphere by varying amounts which can be only partially compensated for; (3) The tracker's field of view is too small; it greatly reduces the number of targets that can be seen, as well as the durations of observations. This results in fewer updates, and necessitates a very sophisticated orbit propagator; (4) The already too few beacons can be obscured by cloud cover. This is, perhaps, the most egregious problem with this approach. (FR).
Author: Charlie Rose
Publisher:
ISBN:
Category :
Languages : en
Pages : 69
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Book Description
The question of whether a beacon tracker, similar to the NRL Rad-Hard Star Tracker, can be successfully used in a Landmark Tracking AutoNav application rests squarely on the accuracies required, the number of beacons available, and their optical characteristics as well as distribution over the surface of the Earth. Basically, we have found that a star tracker can be used in a landmark approach, but only within some rather severe constraints: (1) Beacons can be distributed more-or-less uniformly over the Earth. Restriction to the United States does not seem feasible; (2) Position errors of several kilometers can be tolerated between updates; (3) A very sophisticated orbit propagator is built into the system. There are non-trivial problems associated with this approach to the problem. Most of them stem from the fact that the tracker would be used in a way for which is was not designed nor intended. (1) The beacons 'twinkle'; (2) The light from the beacons is refracted by the atmosphere by varying amounts which can be only partially compensated for; (3) The tracker's field of view is too small; it greatly reduces the number of targets that can be seen, as well as the durations of observations. This results in fewer updates, and necessitates a very sophisticated orbit propagator; (4) The already too few beacons can be obscured by cloud cover. This is, perhaps, the most egregious problem with this approach. (FR).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1028
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Book Description
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.
Author: Dayi Wang
Publisher: Springer Nature
ISBN: 981154879X
Category : Technology & Engineering
Languages : en
Pages : 352
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Book Description
This book introduces readers to the fundamentals of estimation and dynamical system theory, and their applications in the field of multi-source information fused autonomous navigation for spacecraft. The content is divided into two parts: theory and application. The theory part (Part I) covers the mathematical background of navigation algorithm design, including parameter and state estimate methods, linear fusion, centralized and distributed fusion, observability analysis, Monte Carlo technology, and linear covariance analysis. In turn, the application part (Part II) focuses on autonomous navigation algorithm design for different phases of deep space missions, which involves multiple sensors, such as inertial measurement units, optical image sensors, and pulsar detectors. By concentrating on the relationships between estimation theory and autonomous navigation systems for spacecraft, the book bridges the gap between theory and practice. A wealth of helpful formulas and various types of estimators are also included to help readers grasp basic estimation concepts and offer them a ready-reference guide.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 594
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Book Description
Author: Changjiu Zhou
Publisher: Physica
ISBN: 3790817678
Category : Computers
Languages : en
Pages : 505
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Book Description
This book contains an edited collection of eighteen contributions on soft and hard computing techniques and their applications to autonomous robotic systems. Each contribution has been exclusively written for this volume by a leading researcher. The volume demonstrates the various ways that the soft computing and hard computing techniques can be used in different integrated manners to better develop autonomous robotic systems that can perform various tasks of vision, perception, cognition, thinking, pattern recognition, decision-making, and reasoning and control, amongst others. Each chapter of the book is self-contained and points out the future direction of research. "It is a must reading for students and researchers interested in exploring the potentials of the fascinating field that will form the basis for the design of the intelligent machines of the future" (Madan M. Gupta)
Author: Michael J Rycroft
Publisher: Springer Science & Business Media
ISBN: 9401598800
Category : Technology & Engineering
Languages : en
Pages : 344
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Book Description
Y. Fujimori, Symposium Programme Committee Chair, and Faculty Member, International Space University e-mail: fujimori@isu. isunet. edu M. Rycroft, Faculty Member, International Space University e-mail: rycroft@isu. isunet. edu Building on the foundations provided by the International Space Station, now partially constructed and already in use in low Earth orbit, what will be the future directions of human spaceflight? This was the key question discussed from many viewpoints - technical, entrepreneurial, governmental, legal - at the seventh Annual Symposium held in Strasbourg, France, early in June 2002. Many ideas on the "whys" and the "hows" of our future exploration of the final frontier were put forward in a stimulating environment. The unique perspective of the International Space University (ISU) - namely an interdisciplinary, international and intercultural perspective - enhanced both the presentations and the discussions. More than 150 people attended the Symposium, including the current members of the Master of Space Studies class who are attending an 11 month course at ISU. They are young professionals and postgraduate students who develop in-depth some part of the broad Symposium theme in their parallel Team Projects. Their final reports will be completed at the end of July 2002, and will be published independently. 1 Beyond the ISS: The Future of Human Spaceflight Keynote Address: A Summary The Need for a New Vision E. Vallerani, Advanced Logistic Technology Engineering Center, The Italian Gateway to the ISS, Corso Marche 79, Torino 10146, Italy e-mail: vallerani. ernesto@spacegate-altec.
Author: United States. President
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 100
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Book Description
Author: United States. President
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 430
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Book Description
Author: Charles Fox
Publisher: Springer Nature
ISBN: 3030891771
Category : Computers
Languages : en
Pages : 451
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Book Description
The volume LNAI 13054 constitutes the refereed proceedings of the 22th Annual Conference Towards Autonomous Robotic Systems, TAROS 2021, held in Lincoln, UK, in September 2021.*The 45 full papers were carefully reviewed and selected from 66 submissions. Organized in the topical sections "Algorithms" and "Systems", they discuss significant findings and advances in the following areas: artificial intelligence; mechatronics; image processing and computer vision; special purpose and application-based systems; user interfaces and human computer interaction. * The conference was held virtually due to the COVID-19 pandemic.
Author: Stefano Ferretti
Publisher: Springer Nature
ISBN: 3030219380
Category : Technology & Engineering
Languages : en
Pages : 435
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Book Description
This book, edited by the European Space Policy Institute, is the first international publication, following UNISPACE+50, to analyze how space capacity building can empower the international community towards fully accessing all the economic and societal benefits that space assets and data can offer. New innovation models are increasingly spreading across various sectors and disciplines, including space, which is becoming an integral part of many societal activities (e.g. telecoms, weather, climate change and environmental monitoring, civil protection, infrastructures, transportation and navigation, healthcare and education). The book helps readers construct their own space capacity building roadmaps, which take into account key stakeholders and also new private actors, NGOs and civil society. Starting from a policy and strategy perspective, it addresses key aspects of capacity building, including innovation and exploration, global health, climate change and resilient societies. It outlines the available options and summarizes the ideal programmatic conditions for their successful implementation. Showcasing reflections from a range of senior space professionals around the world, with their unique perspectives and solutions, it provides a rich mosaic in which various cultural and policy approaches to space are translated into actionable programs and ideas so that space may truly benefit all of humankind.
