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Showing 1 to 20 of 21 for “"Spacecraft trajectory"”.
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Spacecraft trajectory optimization using many embedded Lambert problems
Improvement of spacecraft trajectory optimization approaches, methods, and techniques is critical for better mission design. Preliminary low-fidelity analysis precedes high-fidelity analysis to efficiently explore the space of a problem. The work of this dissertation extends an embedded boundary …
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Spacecraft trajectory targeting by boundary-condition orbit fitting
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1984.
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Spacecraft Trajectory Planning for Optimal Observability using Angles-Only Navigation
… optimal range observability maneuvers and trajectory planning methods for spacecraft under constrained relative motion. The resulting contribution is a guidance method for impulsive rendezvous and proximity operations valid for elliptic orbits of arbitrary eccentricity.</p> <p>The system …
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Constrained Motion Analysis of Spacecraft Trajectory in Restricted Three Body Problem
… satellites are being maintained on their desired trajectory. Indian space research organization has planned to launch the Aditya-L1 spacecraft to study about the Sun by 2021. James Webb Space Telescope has also been designed to observe deep space at L2 in the Sun-Earth system by 2021. The combined …
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Spacecraft Trajectory Optimization Suite: Fly-Bys with Impulsive Thrust Engines (Stops-Flite)
<p>Spacecraft trajectory optimization is a near-infinite problem space with a wide variety of models and optimizers. As trajectory complexity increases, so too must the capabilities of modern optimizers. Common objective cost functions for these optimizers include the propellant utilized by the …
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Spacecraft trajectory design utilizing resonance orbits in a hybrid optimal control framework
Low-energy trajectories are a growing subset of trajectory design, particularly in the three-body space. These trajectories use the inherent stability and instability of certain orbits as a means of fuel efficient transfers. Traditionally, work on these types of trajectories has taken a very “hands …
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Novel methods for high-fidelity low-thrust spacecraft trajectory optimization and mission design
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Spacecraft trajectory tracking and parameter estimation in the presence of a splitting contact binary asteroid
… a newly-formed binary system and controlling a spacecraft’s trajectory in the system’s vicinity is investigated. An indirect adaptive control scheme is utilized to simultaneously and accurately meet both objectives. Finally, a simpler control scheme, based only on 2-body dynamics is derived to …
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Spacecraft Trajectory Optimization Suite (STOpS): Optimization of Multiple Gravity Assist Spacecraft Trajectories Using Modern Optimization Techniques
<p>In trajectory optimization, a common objective is to minimize propellant mass via multiple gravity assist maneuvers (MGAs). Some computer programs have been developed to analyze MGA trajectories. One of these programs, Parallel Global Multiobjective Optimization (PaGMO), uses an interesting …
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Spacecraft Trajectory Optimization Suite (STOPS): Optimization of Low-Thrust Interplanetary Spacecraft Trajectories Using Modern Optimization Techniques
<p>The work presented here is a continuation of Spacecraft Trajectory Optimization Suite (STOpS), a master’s thesis written by Timothy Fitzgerald at California Polytechnic State University, San Luis Obispo. Low-thrust spacecraft engines are becoming much more common due to their high efficiency, …
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Interplanetary Trajectory Optimization with Automated Fly-By Sequences
<p>Critical aspects of spacecraft missions, such as component organization, control algorithms, and trajectories, can be optimized using a variety of algorithms or solvers. Each solver has intrinsic strengths and weaknesses when applied to a given optimization problem. One way to mitigate …
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Orbital Optimization of Interplanetary Trajectories with Environmental Perturbations
… optimization, it is desired to incorporate a spacecraft environment model in order to have maximum confidence that the analysis will produce an accurate trajectory. Such a model requires the addition of orbital perturbations, or small forces acting on the spacecraft throughout its trajectory …
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Applications of Second-Order Necessary and Sufficient Conditions to Optimal Trajectories
… to various optimal control problems, including spacecraft trajectory problems with constant thrust acceleration and with time-varying low thrust acceleration for a power-limited rocket engine. A solution that simultaneously maximizes final orbit energy and minimizes propellant consumption is …
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"Smoking-Gun" Observables of Magnetic Reconnection: Spatiotemporal Evolution of Electron Characteristics Throughout the Diffusion Region
… the temporal stage of reconnection. Cluster spacecraft measurements from a magnetotail reconnection exhaust region agree with these simulation predictions. In PIC simulations of asymmetric reconnection, EDR distributions acquire crescent-shaped populations, indicative of accelerated …
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Modeling the effect of trend information on human failure detection and diagnosis in spacecraft systems
… is explicitly available to operators of spacecraft systems. The presence of this additional information also improved decision consistency. However, it made no significant difference for subjects' detection accuracy, diagnosis latency or achievement. Other predictors of latency and …
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Breaking things so you don’t have to: risk assessment and failure prediction for cyber-physical AI
… design and verification framework to optimize spacecraft trajectory and control systems, multi-agent formation and communication strategies, vision-in-the-loop controllers for autonomous vehicles, and robust generation dispatch for electrical power systems, and I apply this failure diagnosis …
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Guidance and control for multi-stage rendezvous and docking operations in the presence of uncertainty
… and docking, but also rely on maneuvering spacecraft once docked. For example, there is active interest in orbital debris removal, on-orbit assembly, on-orbit refueling, and on-orbit servicing and repair missions. As these missions become more and more popular, the number of rendezvous and …
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Automated global optimization of low-energy trajectories using a hybrid optimal control framework
… and if successful, it generates a single trajectory of interest. A change in initial conditions or spacecraft parameters would require repeating the entire process. Multi-phase trajectories are defined for this study as trajectories that have multiple arcs that require propulsive maneuvers …
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The Non-Linear PARallel OPtimization Tool (NLPAROPT): A Software Overview and Efficiency Analysis
Modern spacecraft trajectory mission planning regularly involves some component of numerical optimization to provide a significant improvement in a solution, and in some instances is the only manner for finding an acceptable solution to a problem. One of the most useful constrained optimization …
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Robust preliminary design for multiple gravity assist spacecraft trajectories
The development of a new spacecraft trajectory design method most often occurs because a particular capability does not exist. The invention is usually considered successful so long as it is capable of producing solutions to the problem in question, and thus satisfies a particular design …
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