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 40 for “"Space situational awareness"”.
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LIDAR design for space situational awareness
Space Situational Awareness (SSA) is a growing concern for National Security. Among the many methods of increasing SSA is the use of space-based Laser Imaging, Detection And Ranging (LIDAR) sensors to detect, track, classify or image other spacecraft. This Thesis explores the unique trade-spaces …
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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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Target search methods for space situational awareness
… target in an orbit around the Earth using a space based sensor. Searching for a target among a large set of candidate orbits is a difficult and time consuming problem. Considering orbital dynamics, sensor uncertainties and the initial size of candidate location distribution, it is desirable …
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Unresolved Image Simulation for Space Situational Awareness Applications
… around Earth is at best a guess. Decades of spaceflight, debris buildup, and vehicle collisions have contributed to a large number of objects that are simply not able to be catalogued. Ongoing efforts to catalog debris in orbit have reached limits by conventional measures and as such, …
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Characterizing Effective System Architectures for Cislunar Space Situational Awareness
Achieving Space Situational Awareness (SSA) in the Cislunar region—the area between the geosynchronous belt and the Moon's gravitational boundary—poses significant technological and organizational challenges. Instead of proposing new theoretical systems, this thesis employs the Architecting …
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Adaptive Methods of Resident Space Object Identification for Space Situational Awareness
<p>One of the fundamental tenets of Space Situational Awareness (SSA) is the detection and sub sequent identification of Resident Space Objects (RSOs) within unresolved optical space imagery. This function is vital to the documentation and tracking of RSOs in their respective operational orbits, …
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Autonomous and Responsive Surveillance Network Management for Adaptive Space Situational Awareness
As resident space object populations grow, and satellite propulsion capabilities improve, it will become increasingly challenging for space-reliant nations to maintain space situational awareness using current human-in-the-loop methods. This dissertation develops several real-time adaptive …
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Heterogeneous Satellite Constellation Design for Cislunar Space Situational Awareness Using Real Options Analysis
… however, makes the implementation of an adequate Space Situational Awareness (SSA) capability both necessary and extraordinarily difficult. Future aerospace leaders may find them selves breaking from traditional paradigms for architecture definition, systems engineering, and program costing [43]. …
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Developments for the Characterization of Spacecraft Proximity Operations for Improved Space Situational Awareness
As space becomes increasingly populated by numerous individuals and organizations, the capabilities of satellites on orbit have also improved. A variety of satellites are able to perform operations in close proximity to each other in order to complete a number of different missions. Maintaining …
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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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Encoding the Sensor Allocation Problem for Reinforcement Learning
Traditionally, space situational awareness (SSA) sensor networks have relied on dynamic programming theory to generate tasking plans which govern how sensors are allocated to observe resident space objects. Deep reinforcement learning (DRL) techniques, with their ability to be trained on simulated …
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Image Classification and Initial Orbit Determination of Resident Space Objects (RSO)
The importance of Space Situational Awareness (SSA) research is steadily growing due to continuous launches of new technologies, leading to increased congestion and potential collisions in Earth’s orbit. Optical imagers, based in both ground and space, serve as important tools for observing, …
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Developing the detectability, identifiability, and trackability analysis for the space sustainability rating
Three of the core activities in maintaining Space Situational Awareness (SSA) efforts are the Detection, Identification, and Tracking of Anthropogenic Space Objects (ASOs). For much of the space age, the onus for improving global SSA has fallen primarily on the ground-based satellite surveillance …
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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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A* Node Search and Nonlinear Optimization for Satellite Relative Motion Path Planning
… rendezvous and proximity operations about space objects is central to the next generation of space situational awareness. The ability to diagnose and respond to spacecraft anomalies is often hampered by the lack of capability to perform inspection or testing on the target vehicle in flight. …
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Estimation of Spacecraft Attitude Motion and Vibrational Modes Using Simultaneous Dual-Latitude Ground-Based Data
<p>Cutting-edge Space Situational Awareness (SSA) research calls for improved methods for rapidly characterizing resident space objects. In this thesis, this will take the form of speeding up convergence of spacecraft attitude estimates, and of a non-model-based approach to the detection of …
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Operational Scheduling of Deep Space Radars for Resident Space Object Surveillance
As space becomes increasingly congested and contested, new capabilities of rivals to threaten vital assets and exploit the area for military advantages make it more important than ever for the United States to proficiently track and monitor space traffic and debris. However, currently the system of …
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Application of the backward-smoothing extended Kalman filter to attitude estimation and prediction using radar observations
… (LAES), a new tool being developed for the Space Situational Awareness Group (SSAG) at MIT Lincoln Laboratory, integrates several existing hardware and software systems, with a backward-smoothing extended Kalman filter (BSEKF). LAES is intended to determine the rotational motion of a freely …
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System Design and Implementation of the Virginia Tech Optical Satellite Tracking Telescope
… (COTS) designed tracking system for Space Situational Awareness (SSA) data contribution. A novel approach is considered, combining two COTS systems, a high-powered telescope, built for astronomy purposes, and a larger field of view (FOV) camera. Using only publicly available two-line …
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