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 18 of 18 for “"Space Surveillance"”.
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Autonomous Space Surveillance for Arbitrary Domains
<p>Space is becoming increasingly congested every day and the task of accurately tracking satellites is paramount for the continued safe operation of both manned and unmanned space missions. In addition to new spacecraft launches, satellite break-up events and collisions generate large amounts of …
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Experimental study of non-resolved active polarimetry for space surveillance
Man-made space debris constitutes a major threat to the future of the space enterprise. The space surveillance community continually seeks more efficient and robust techniques for detecting and characterizing on-orbit debris. This thesis investigates the potential utility of a technique known as …
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Geosynchronous orbit determination using space surveillance network observations and improved radiative force modeling
Correct modeling of the space environment, including radiative forces, is an important aspect of space situational awareness for geostationary (GEO) spacecraft. Solar radiation pressure has traditionally been modeled using a rotationally-invariant sphere with uniform optical properties. This study …
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NAVSPASUR sensor performance study
The Naval Space Surveillance Command (NAVSPASUR) has been in existence since the late 1950's. Operating with a formidable array of three large transmitters and six receiving stations, the command has carried out the mission of surveilling and cataloging a
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Information inference for cyber-physical systems with application to aviation safety and space situational awareness
… composed of physical plants (e.g., aircraft, spacecraft, ground vehicles, etc.) and cyber components (e.g., sensing, communication, and computing units), and thus called as Cyber-Physical Systems (CPSs). For safe, efficient, and sustainable operation of a CPS, the states and physical …
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STARE CubeSat Communications Testing, Simulation and Analysis
The Space-based Telescope for the Actionable Refinement of Ephemeris (STARE) CubeSat will play an important role in contributing to this nations space situational awareness (SSA), perhaps one day becoming an integral part of the space surveillance network (SSN) to track orbital debris and …
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An expert system for processing uncorrelated satellite tracks.
… expert system for processing UCT's at the Naval Space Surveillance Command was developed. Rules were generated through traditional knowledge engineering methods and by a novel application of machine learning. The initial results are very good with the operational portions of the system matching …
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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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Reactive, Autonomous, Markovian Sensor Tasking in Communication Starved Environments
The current Space Traffic Management (STM) community was not prepared for the exponential increase in the resident space object (RSO) population that has taken place over the last several years. The combination of poor communication infrastructure and long scheduling lead times of the Space …
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Spacecraft Orbiting and Uncertainty - Planning Surveillance
Scheduling of the Space Surveillance Network (SSN) is a crucial operation for the maintenance of safety and operations in Earth’s orbit. However, the capabilities of the SSN are limited and the number of objects that are being tracked is increasing with every year. This work proposes harnessing …
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In Harm's Way: The Continued Relevance of the U.S. Navy's Forward Presence Mission in the Post-Cold War World
… Others suggest that "virtual presence" through space surveillance and global air power can replace the physical presence of naval forces. Still others have advocated a return to an isolationist policy, forgoing military presence altogether. Although U.S. naval forces are no longer required to …
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Orbit determination using modern filters/smoothers and continuous thrust modeling
… of electric propulsion technology for spacecraft has led to reduced costs and longer lifespans for certain types of satellites. Because these satellites frequently undergo continuous thrust, predicting their motion and performing orbit determination on them has introduced complications …
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Investigating the use of ray tracing for signal-level radar simulation in space monitoring applications: a comparison of radio propagation models
… signal-level radar simulator with an emphasis on space debris monitoring in the Low Earth Orbit. Space surveillance represents a major topic of concern to astronomers as the threat of space debris and orbital overpopulation looms – particularly due to the lack of effective mitigation techniques …
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A Variable-Step Double-Integration Multi-Step Integrator
… Stormer-Cowell method is designed for space surveillance applications,which require numerical integration methods to track orbiting objects accurately. Because of the large number of objects being processed, methods that can integrate the equations of motion as fast as possible while …
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Adaptive Path Following of the Biomorphic Hyper-Redundant Snake Robot in Unconstructed Environment
… applications, like the earthquake rescue, narrow space surveillance and even overwater or underwater explorations.
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Mission Planning Tool for space debris studies with the MeerKAT radar
… the MeerKAT radio telescope as receiver for space debris detection, tracking and imaging. This dissertation details the development of a Mission Planning Tool (MPT) to perform sensor scheduling and to support the performance prediction and analysis of the proposed MeerKAT radar. The MeerKAT …
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Uncertainty-Based Methodology for the Development of Space Domain Awareness Architectures in Three-Body Regimes
… has seen a massive growth in interest in lunar space exploration. An increase in global competition has led a growing number of countries and non-governmental organizations towards lunar space exploration as a means to demonstrate their industrial and technological capabilities. This increase in …
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Female identity and landscape in Ann Radcliffe's Gothic Novels
The purpose of this dissertation is to chart the development of an ambivalent female identity in the Gothic genre, as exemplified by Ann Radcliffe's late eighteenth century fictions. The thesis examines the social and literary context of the emergence of the Gothic in English literature and argues …