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 279 for “"earth orbit"”.
-
Medical Constraints in Spaceflight: Venturing Beyond Low Earth Orbit
… model of medical care used in spaceflight in low-earth orbit to a model of medical care that will be conducive to exploration space missions. The intent of this project was to identify organizations that are doing research and development or have established products that will fulfill the closure …
-
Observation of Low Earth Orbit Debris using GNSS Radar
… GNSS signals to detect small space debris in Low Earth Orbit (LEO). The LEO debris moves at approximately double the speed of the GPS satellite, and with much greater angular rate from the receiver. Hence the illumination and reflected signal are expected to differ in both phase and phase rate …
-
Near Earth orbit determination and rendezvous navigation using GPS
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1986
-
Low Earth Orbit Spacecraft Slotting: Towards an Implementable Proposal
The growth in the number of proposed low Earth orbit (LEO) satellites is driven primarily by large commercial communications constellations. The launch of even half of the proposed satellites would result in an order-of-magnitude increase in active spacecraft traffic, with significant implications …
-
Low Earth Orbit Stability Analysis Using Monte-Carlo Techniques
… This thesis focuses on MOCAT-MC- MIT’s Orbital Capacity Analysis Toolbox Monte Carlo. MOCATMC propagates individual space objects while accounting for various probabilistic factors common to LEO RSOs including mission failure, collision and space weather while open to new capabilities. …
-
An analysis of low-earth-orbit-satellite communication systems
… systems in the world. One such system, low-earth-orbit satellites, can provide store-and-forward, as opposed to real time, communication for many earth stations. The advantages and disadvantages of such a system is presented. Material covering protocols and communications architectures is …
-
Autonomous materials for active erosion resistance in low-Earth orbit
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-12-01
-
HEXANE : architecting manned space exploration missions beyond low-earth orbit
… long-term designs for manned spaceflight beyond Earth orbit remain indefinite. Although progress has been made in plans for operations on orbit, the capabilities gap for manned spaceflight beyond orbit has grown. Gaining an understanding of the trade-offs inherent in future system architectures …
-
Proliferated Low Earth Orbit (pLEO) Satellite Constellation Handover Cost Analysis
… for users. This is very true of proliferated Low Earth orbit (pLEO) satellite constellation networks in which both the satellite and the user are mobile with respect to each other. As satellites travel in their obits, they move into and out of ground users’ views every few minutes [4], and mobile …
-
Design and Validation of Advanced Tools for Earth Orbit Conjunction Analysis
… creciente para la sostenibilidad del entorno orbital. En este contexto, el análisis de conjunciones ha emergido como un pilar clave en la gestión del tráfico espacial, al proporcionar métodos para detectar, evaluar y mitigar el riesgo de colisiones. Esta tesis se inscribe en este marco, …
-
The Impact of Low-Earth-Orbit Satellites on GNSS Ambiguity Resolution
In this thesis, the impact of low-earth-orbit (LEO) satellites on carrier phase ambiguity resolution is demonstrated through a global covariance simulation and a hardware in-the-loop simulation. Dedicated LEO constellations for GNSS are expected to become operational within the next few years and …
-
On-Orbit Servicing System Architectures for Proliferated Low Earth Orbit Constellations
On-orbit servicing (OOS) presents new opportunities for refueling, inspection, repair, maintenance, and upgrade of spacecraft (s/c). OOS is a significant area of need for future space growth, enabled by the maturation of technology and the economic prospects. This congestion is leading s/c …
-
Dynamics and Control of a Tensegrity System in Low-Earth Orbit
… looks at placing a tensegrity structure in orbit around the Earth. As a spacecraft's orbit is moved further away from the Earth, the strength of the Earth's gravity field lessens. Ideally, such a flexible structure would be placed far enough away from the Earth so that the gravity field …
-
A variable-rate modulation and coding scheme for low earth orbit satellites
Low Earth Orbit (LEO) satellites are increasingly being used for a wide variety of communications applications. These satellites have to operate in widely varying channel conditions. These conditions are often significantly better than the 'worst case' situations that are experienced and thus a …
-
Stochastic design optimization of modular, reconfigurable, persistent support platforms in Earth orbit
DSpace SAF Submission Ingestion Package generated from Vireo submission #13750 on 2019-08-22 at 14:44:50
-
Trajectory design for solar sailing from low-Earth orbit to the Moon
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
-
Overhead channel power control in a low earth orbit satellite communication system
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
-
Detailed thermal analysis of a thin-shell, spherical radiometer in Earth orbit
… The results of the analysis reveals that the earth radiation field is not diffuse. The polar ice caps were found to reflect incident solar radiant flux specularly to the spherical detector. The absorptance of the earth-'reflected solar component as a function of incident angle is important and …
Page 1 of 14