Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"space operations"”.
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Speedes: A Case Study Of Space Operations
… functional parallelism present within the Space Shuttle Operations Flow using the Synchronous Parallel Environment for Emulation and Discrete-Event Simulation (SPEEDES), an object-oriented multi-computing architecture. SPEEDES is a unified parallel simulation environment, which allocates …
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Coordinated dynamic planning for air and space operations
Planners of military air and space operations in a battlefield environment seek to allocate resources against targets in a way that best achieves the objectives of the commander. In future conflicts, the presence of new types of assets, such as tactical space-based sensors and Operationally …
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Scaling address-space operations on Linux with TSX
… system, which currently serializes address-space operations with a lock. TSX should provide scalability by supporting concurrent address-space operations. Achieving scalability with TSX, however, turned out to be difficult due to transactional aborts. This thesis details how to identify and …
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Satellite Drag and Sustainable Space Operations in a Dynamic Thermosphere
… and collision avoidance essential for safe operations. These efforts require not just accurate trajectory predictions, but also credible estimates of uncertainty. In LEO, variability in atmospheric drag is by far the dominant source of propagation error, often leading to deviations of …
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Incorporating Industry Needs into the Development of an Undergraduate Degree in Commercial Space Operations
<p>The rapid expansion of the commercial space industry, not unlike the aviation industry in the early 20<sup>th</sup> century, has left the industry facing unique challenges. As companies continue to expand, the need for a well-trained workforce becomes critical. The needed workforce must be …
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Space situational awareness CubeSat concept of operations
The concept of space situational awareness (SSA) is important to preserve manned and unmanned space operations. Traditionally, ground based radar, electro-optical sensors and very limited space-based assets have been used as part of the space surveillance network (SSN) to track orbital debris, …
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Investigation of Orbital Debris Situational Awareness with Constellation Design and Evaluation
… is a current and growing threat to reliable space operations and new space vehicle traffic. As space traffic increases, so does the economic impact of orbital debris on the sustainability of systems that increasingly support national security and international commerce. Much of the debris …
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Increasing Mars 2020 Mission Efficiency via SAPP Operations Automation and AEGIS V&V
… input is still required and valuable in the space operations process. However, human time and rover time are precious and efforts must be made to make missions as efficient as possible. This thesis addresses the need for mission efficiency by implementing operational improvements to the Mars …
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Airspace Integration of New Entrants and Safety Risk Management Models
<p><br /> In recent years, the demand for airspace access of Unmanned Aerial Systems (UAS) increased significantly and is continuously increasing for different altitude-types UAS. A similar evolution is expected from Commercial Space Operations (CSO) in the next years. These aviation/aerospace …
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African perspective on integrated space and air traffic management
Space Traffic Management (STM) is an emerging area of interest in the space sector because States and private actors are collaborating on ways to manage the growing congestion in orbit and to mitigate the impact of space debris and space weather as part of sustainable use and exploration of outer …
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Probabilistic and learning approaches through concurrent parameter estimation and adaptive control for in-space robotic assembly
Autonomous and multi-agent space operations within the context of in-space robotic servicing, assembly, and debris removal have received particular attention from both research and industry communities. The presence of uncertainties and unknown system parameters amongst these missions is prevalent, …
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Instructional footprinting: a basis for exploiting concurrency through instructional decomposition and code motion
… to the operating system or as advanced as Tuple Space operations specific to a Linda programming system. The problem with such calls, however, is that they block while waiting for data or information to be returned. This synchronous nature and lack of concurrency can be avoided by initiating a …
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Engineering and policy analysis of strategic and tactical options for future aerospace traffic management
Current space launch/landing events are conducted only within Special Use Airspace (SUA), separate from air traffic. This is a strategic traffic management policy because SUA size and duration are set well in advance. It forces space operations to disrupt aviation, which could become costly with …
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Unsupervised learning of disentangled representations for speech with neural variational inference models
… latent representations, and derive novel latent space operations for speech transformation. The transformation method is applied to unsupervised domain adaptation problems, which addresses the transferability issues of supervised machine learning framework. We then extend the VAE models, and …
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Design and verification of a safe autonomous satellite rendezvous maneuver
A fundamental maneuver in autonomous space operations is known as rendezvous, where an active spacecraft navigates towards and maneuvers within close proximity of a free-flying passive spacecraft. Any mistake during autonomous space flight can be extremely costly, yet these systems are difficult to …
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Leveraging Information Sharing for Satellite Navigation and Coordination
… centralized conjunction analysis, decentralized space traffic management distributes coordination across multiple independent nodes, allowing satellites to collaborate directly. This approach could enhance the resilience, speed, and international cooperation of space operations, helping to manage …
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Controlling Neural Language Generation
… their use to control generation through latent space operations. We establish a theory on how to mold a meaningful latent space geometry for discrete text data. Building on this, we develop a family of denoising text autoencoders that demonstrate the potential of attribute modification (e.g., …
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In Space Reverse Logistics
This study proposes In Space Reverse Logistics (ISRL), a fully reusable multi-mission network design for mitigating and remediating space debris in proliferated Low Earth Orbit (pLEO) constellations. The ISRL design aims to collect defunct satellites from their operating orbits and to bring them to …
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On-Orbit Characterization of a Microelectromechanical Systems (MEMS) Deformable Mirror (DM): Mission Results from the Deformable Mirror Demonstration Mission (DeMi) CubeSat
… (DM) on orbit for the first time. As part of space-borne adaptive optics systems, DMs correct optical aberrations and speckles due to mechanical, thermal, and optical effects. MEMS DMs are particularly well suited for space systems because they are compact, low power devices and have a high …
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Low Earth Orbit Stability Analysis Using Monte-Carlo Techniques
Space domain awareness and the issue of space congestion have become critical topics, particularly with the proliferation of private companies launching large LEO constellations (LLCs), or mega-constellations, including SpaceX’s Starlink and Amazon’s Kuiper. This rapid expansion has led to …
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