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.
Results
Showing 1 to 20 of 80 for “"Astrodynamics"”.
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Astrodynamics of the Next Generation Space Weather Prediction Mission
<p>Accurate prediction of the solar wind properties, interplanetary magnetic field direction and various space weather phenomena becomes ever more important as our dependence on Earth orbiting spacecraft increases. Different solar wind drivers can lead both to enhancements and losses of …
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Path optimization using sub-Riemannian manifolds with applications to astrodynamics
… of how the method works and an application to astrodynamics is also given.
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Astrodynamics Modeling and Optimization of Space Logistics Maneuvers for Earth and Cislunar Orbits
L'abstract è presente nell'allegato / the abstract is in the attachment
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Utilizing Augmented Reality for Immersive Space Mission Design
… process that requires a strong background in astrodynamics and programming due to the complex dynamical environment of space. The current 2D visualization methods for displaying these geometrically abstract trajectories make it difficult to understand the true nature of more complex orbits. …
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Spacecraft-ns3: Spacecraft Discrete-Event Network Simulation
… created in recent years, they all lack rigorous astrodynamics models or use high-fidelity but bulky and computationally taxing commercial software. This research presents Spacecraft-ns3, an extension to the ns-3 network simulator. Using a modular approach, Spacecraft-ns3 propagates orbit state, …
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Optimal finite-thrust Trans-Earth Injection (TEI) maneuvers for a Low Lunar Orbit (LLO) earth return mission
… to develop rapid and robust control solutions in astrodynamics applications. With the renewed efforts in resuming future manned missions to the moon or near-earth asteroids, fuel optimal flight trajectories are desired in order to alleviate the need for overestimates in fuel carried onboard, which …
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Interplanetary trajectory analysis for 2020-2040 Mars missions including Venus flyby opportunities
… flyby options based on the knowledge of astrodynamics and analyzes Mars trajectories in the time frame 2020 to 2040, including transfer trajectories with Venus flybys. Using the trajectory programs developed in this work, we investigate the relation between departure and arrival dates and …
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Coupled Dynamics in the Cislunar Region and Spacecraft Attitude Prediction in a Higher-Fidelity Model
… This thesis advances the state of the art in astrodynamics by modeling all bodies in the problem as rigid bodies, allowing for spacecraft orientation to be propagated and considered. Two models are under consideration—the circular restricted full three-body problem (CRF3BP) and a full …
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Optimization of Spacecraft Formations about Lagrange Points for the Next Generation Space Weather Prediction Mission
… Weather Prediction Mission is feasible from an astrodynamics perspective.</p>
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Satellite constellation design for mid-course ballistic missile intercept
… illustrates how known design methods and astrodynamics techniques can be used to create new and viable methods of space-based missile defense.
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Robust Adaptive Rigid Body State and Mass Property Estimation Via Unscented Kalman Filter on TSE(3) with Process Noise Estimation
… challenging problem in spacecraft autonomy and astrodynamics. Knowledge of mass properties of a spacecraft is essential for future astronautical missions, as changes in the mass properties of a spacecraft due to a shift in cargo distribution often require a careful and costly recalculation to …
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Koopman Operator Theory Applied to Lambert’s Problem with a Spectral Behavior Analysis
Astrodynamics is abundant with nonlinear dynamical systems, such as satellites operating within Earth’s gravitational field. With the increase in the number of satellite constellations, making accurate predictions of the motion of satellites throughout space is becoming more relevant than ever. …
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Technology for the Solution of Hybrid Optimal Control Problems in Astronautics
… solution of optimal trajectory problems in astrodynamics. This enables the very large number of solutions required by HOCP solvers to be quickly and reliably obtained and is accomplished in several ways. First, genetic algorithm (GA) based methods are specialized to solve several types of …
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Orbital Maneuvers and Interplanetary Trajectory Design via Reinforcement Learning
… exploration of learning-based methods in astrodynamics.</p>
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The Non-Linear PARallel OPtimization Tool (NLPAROPT): A Software Overview and Efficiency Analysis
… reduced. Based on these analyses, any astrodynamics researcher can use the trends from these results to efficiently run any optimization problem in NLPAROPT. NLPAROPT already shows great promise as a rapid, robust NLP solver. Unexplored parallelization opportunities still exist within …
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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
… software has aptly been named the Space Object Astrodynamics and Radar Simulator – or SOARS. SOARS was built upon the foundations of a general-purpose radar simulator known as the Flexible Extensible Radar Simulator – or FERS – which provided integrated radar models for propagation loss, antenna …
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Trajectory design in the spatial circular restricted three-body problem exploiting higher-dimensional Poincare maps
<p>In this investigation, the role of higher-dimensional Poincaré maps in facilitating trajectory design is explored for a variety of applications. To begin, existing strategies to implement Poincaré maps for trajectory design applications in the spatial CR3BP are evaluated. New applications for …
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Orbital Determination Feasibility of LEO Nanosatellites Using Small Aperture Telescopes
<p>This thesis is directed toward the feasibility of observing satellites on the nano scale and determining an accurate propagated orbit using a Meade LX600-ACF 14” diameter aperture telescope currently located on the California Polytechnic State University campus. The optical telescope is fitted …
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The Collisional Evolution of Orbital Debris in Geopotential Wells and Disposal Orbits
<p>This thesis investigates the orbital debris evolution in the geosynchronous disposal orbit regime and within geosynchronous orbits effected by the geopotential wells. A propagator is developed for the accurate simulation of GEO specific orbits and the required perturbations are determined and …
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Validated global multiobjective optimization of trajectories in nonlinear dynamical systems
… related to current problems of interest in astrodynamics and robotics (respectively). In each case, our results prove consistent with known or strongly conjectured solutions for these problems obtained from highly problem-specific analysis, and overcome the apparent limitations of a …
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