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 39 for “"Earth-Moon"”.
-
A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system
… near future, several space applications in the Earth-Moon system may require a spacecraft to hold a stable motion, but the transfer trajectory infrastructure to access such stable motions has not been fully investigated yet. The triangular libration points, <em>L</em> 4and <em>L</em>5, in the …
-
Navigation analysis of Earth-Moon libration point missions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
-
Spacecraft formation flight at sun-earth/moon libration points
… positioned near the libration points of the Sun- Earth/Moon system, have recently received an increase in interest in response to a variety of mission needs. Specifically, missions such as the Micro Arcsecond X-Ray Imaging Mission (MAXIM), Terrestrial Pathfinder (TPF), Stellar Imager (SI) and the …
-
A Comparison of Autonomous Navigation Methods for Earth-Moon Halo Orbits
… of satellite tracking for spacecraft around the Moon are unequipped to handle this increase in demand. Therefore, a reliable method of performing autonomous navigation in lunar space is required to facilitate this new interest. Many methods of performing this autonomous navigation have been …
-
Designing Transfers Between Earth-Moon Halo Orbits Using Manifolds and Optimization
Being able to identify fuel efficient transfers between orbits is critical to planning and executing missions involving spacecraft. With a renewed focus on missions in cislunar space, identifying efficient transfers in the dynamical environment characterized by the Circular Restricted Three-Body …
-
Solar Sailing Adaptive Control Around the Earth-Moon Lagrange Point L4 for Stellar Observations
… the solar corona from L<sub>4</sub> of the Earth-Moon system. Single and multiple shooting techniques are described along with a pseudo arc-length continuation method for preliminary orbit design. Periodic orbits in the vicinity of L<sub>4</sub> are obtained in the context of the Earth-Moon …
-
Design of transfers from Earth-Moon L 1/L2 libration point orbits to a destination object
… robotic spaceflight activities, orbits near the Earth-Moon L1 and L2 libration points could support lunar surface operations and serve as staging areas for future missions to near-Earth asteroids as well as Mars. In fact, an Earth-Moon L2 libration point orbit has been proposed as a potential hub …
-
Using the Circular Restricted Three-Body Problem to Design an Earth-Moon Orbit Architecture for Asteroid Mining
… is the design of an orbit architecture in the Earth-Moon system (EMS) that facilitates these resources through the mining cycle. In this thesis, it is proposed to use the Circular Restricted 3-Body Problem (CR3BP) to design an orbit architecture composed of L3 Lyapunov orbits, hyperbolic …
-
Promoting mental model-building in astronomy education
… the scientists’ mental model of the Sun-Earth-Moon system. It used an approach suggested by Hesse (1966) in which a model is repeatedly critiqued with respect to the extent that it both represents and fails to represent the structure and properties of a mental model. The study proposed …
-
On the dynamics, stability and control of displaced lunar orbits
… (SEP) at linear order are investigated in the Earth-Moon circular restricted three-body problem (CRTBP). In particular, periodic orbits near the libration points in the Earth-Moon system will be explored along with their applications. A hybrid concept for displaced lunar orbits has been …
-
A new numerical optimization method based on Taylor series for challenging trajectory optimization problems
… problem. This capstone problem is a low-thrust Earth-Moon transfer that uses the interesting dynamics of the circular restricted three body problem (CR3BP), in particular the stable and unstable manifolds of a halo orbit about the interior L1 Lagrange point in the Earth-Moon system.
-
Investigation Into Geometry and Behavior of Cislunar GEO-Grazer Orbits
… to as GEO-grazers: orbits that traverse the Earth–Moon system while grazing or passing below geosynchronous Earth orbit (GEO). These trajectories are of interest for cislunar space domain awareness (SDA) because they provide natural dynamical pathways by which spacecraft or debris originating …
-
An arbitrarily shaped satellite in the restricted problem of three bodies
… orbit about the L₄ triangular point in the earth moon system for the purpose of communication and possibly astronomical observations. Within limits of a linear analysis, an exhaustive and general approach to the dynamical problem is presented. The equations of motion for a finite sized body …
-
Improved collocation methods with application to direct trajectory optimization
… are developed and used to solve minimum-time, Earth-moon orbit transfers. These collocation methods are based on a family of modified Gaussian quadrature rules. This family of rules includes the basic trapezoid and Simpson quadrature rules. The collocation schemes derived from the trapezoid and …
-
Investigation of a Lagrangian-point Propellant Depot Rendezvous Approach for an Interplanetary Mission to Mars
… feasibility of a refueling station for a beyond Earth orbit (BEO) mission. The propellant depot is located at the <em> L</em><sub>2</sub> -Lagrangian point within the Earth-Moon system. This investigation determines if a refueling mission will reduce propulsive energy requirements necessary for …
-
Low thrust augmented periodic orbits in the two- and three-body problems
… circular restricted three-body problem. In the Earth-Moon system, position-only feedback is used to stabilise the local dynamics, and interesting new multiply-periodic orbits are generated. The in-plane and out-of plane natural frequencies are then synchronised, allowing the generation of stable …
-
Integrated modeling and simulation of lunar exploration campaign logistics
… human exploration missions, primarily in the Earth-Moon-Mars system. Also presented in this thesis are the results of numerous trade studies performed using SpaceNet to determining the best mix of mission types (pre-positioning, carry-along and resupply) to achieve sustainable, robust space …
-
Spacecraft trajectory design utilizing resonance orbits in a hybrid optimal control framework
… the first species by providing examples of the Earth-Moon and Jupiter-Europa systems. Finally shown is how these structures are used within the optimization framework. Several non-trivial impulsive trajectory problems from low-Earth to resonance orbits, resonance to resonance transfers, and …
-
Optimization and Characterization of Chance-Constrained Guidance, Navigation, and Control for Low-Energy Lunar Transfers
… dominant gravitating bodies (for example, in the Earth-Moon system or among the gas giant moons) they can offer reduced capture Δv, more flexible launch windows, and an increased set of accessible arrival conditions to any spacecraft willing to deal with the extra transfer time they require. The …
-
Station-keeping and orbital transfers in the vicinity of the Moon exploiting quasi-periodic orbit dynamics
… ahead will be a return to the vicinity of the Moon with robotic exploration missions and crewed space vehicles. Not only is returning to the Moon an inspiring challenge but also and more importantly a return to the Moon opens the possibility to prove new technologies, gain scientific knowledge, …
Page 1 of 2