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 15 of 15 for “"orbital mechanics"”.
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Computer Simulations in Orbital Mechanics
No abstract prepared.
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Results of true-anomaly regularization in orbital mechanics
… governing secular variations of the regular orbital elements in the true-anomaly domain. Complete universal expressions are given for the Keplerian state transition matrix in terms of the orbital transfer angle, and a simple midcourse guidance scheme is rederived in terms of universal …
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Closed Loop Analysis of Space Systems (CLASS) a modular test system for small satellite verification and validation
… CLASS is composed of real-time satellite orbital mechanics and rigid body dynamics simulations executing on a Raspberry Pi 4. The satellite attitude dynamics, orbital mechanics, and space environment properties are computed by the CLASS software reliably and rapidly. It has the ability to …
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Dual Satellite Coverage using Particle Swarm Optimization
… The results are calculated using two different orbital mechanics models: an unperturbed two-body simulation and a two-body simulation with added Earth's equatorial bulge effects. It is shown that the added perturbation reduces the total event time in the optimal solutions generated. Specific …
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Modeling Satellite Formations In The Presence Of Perturbations
… and describe a numerical simulation of the orbital environment including central force field perturbations and atmospheric drag effects which will be a useful analytical tool for investigating issues relating to maintaining satellite formations in low-earth-orbit. Many of the studies done in …
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Optimal satellite constellation spare strategy using multi-echelon inventory control with stochastic demand and lead times
… parking orbits (warehouses) drift away from the orbital planes over time due to orbital mechanics effects, and the in-plane spare stocks (retailers) would receive the resupply from the closest (i.e., minimum waiting time) available warehouse at the time of delivery. The parking orbits (warehouse) …
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Second-Order Relative Motion Equations
This thesis presents an approximate solution of second order relative motion equations. The equations of motion for a Keplerian orbit in spherical coordinates are expanded in Taylor series form using reference conditions consistent with that of a circular orbit. Only terms that are linear or …
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Single Unit and Population Analysis of Saccade-related Fastigial Nucleus Activity in the Alert Monkey
… the neuronal compensation for non-linearities in orbital mechanics. In any case, it is generally agreed that there is a consistent difference in the timing of saccade-related bursts produced by FOR neurones, resulting in shorter latencies for contralateral than for ipsilateral saccades. This …
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Analysis of a CubeSat Orbit Using STK
This thesis presents an analysis of CubeSat orbits for both Low Earth Orbit (LEO) and Sun-Synchronous Orbit (SSO) missions using Systems Tool Kit (STK). The study focuses on analyzing communication, power generation, and radiation exposure while considering various factors. The analysis is based on …
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Analysis of Transfer Trajectories Utilizing Sequential Saturn-Titan Aerocaptures
This thesis aims to investigate the potential of a transfer orbit using successive aerocaptures at Saturn and Titan to establish a science orbit around Titan. Titan is an Earth-like moon with a dense atmosphere and organic compounds present. It has many similarities with Earth that are useful to …
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Optimal strategies for selecting from multiple asteroid interception targets
The goal of this thesis is to demonstrate the applicability of the discrimination time optimization problem to space systems. The concept is applied to an asteroid interception problem using low-thrust propulsion and solved through a combination of particle swarm optimization (PSO) and a commercial …
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Automated trajectory planning for multiple-flyby interplanetary missions
Many space mission planning problems may be formulated as hybrid optimal control problems (HOCP), i.e. problems that include both real-valued variables and categorical variables. In interplanetary trajectory design problems the categorical variables will typically specify the sequence of planets at …
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Orbit control for a spacecraft around a splitting contact binary asteroid
… field of the asteroid. Traditional two-body orbital control methods cannot be applied to the missions to those asteroids because they do not consider the dynamic activities of the asteroids themselves. This thesis proposes and evaluates a control method to follow a predefined path under …
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Conceptual design of HADES a CubeSat conducting radio astronomy in lunar orbit
… using the FreeFlyer software suite to assess orbital stability, science access, and subsystem performance. By incorporating the high-resolution GRAIL GL0660B lunar gravity model and third-body perturbations from the Earth and Sun, the study performed an extensive parameter sweep of the lunar …
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Information Measures For Statistical Orbit Determination
<p>The current Situational Space Awareness (SSA) is faced with a huge task of tracking the increasing number of space objects. The tracking of space objects requires frequent and accurate monitoring for orbit maintenance and collision avoidance using methods for statistical orbit determination. …