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 20 of 98 for “"satellite systems"”.
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Innovative Structural and Mechanical Satellite Systems
This thesis covers two topics within the field of satellite mechanical engineering. The first topic covered is the structural and thermal design and validation BeaverCube 2 Earth-imaging CubeSat. The second topic covered is the electromagnetics modeling and simulation of inductive spin drive for a …
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Inter-LAN services over broadband satellite systems
… Private Business Network (PBN) over a broadband satellite communications system. Such a PBN consists of several User Terminals (UTs); each connected to the router of a LAN in a given plant. A satellite system supports a number of PBNs by dynamically sharing the satellite resources. We considered …
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Transmission scheduling for wireless and satellite systems
We study queuing systems with time-varying service rates, as a natural model of satellite and wireless communication systems. Packets arrive at a satellite to be transmitted to one of the sub-regions (channels) in a service area. The packets are stored in an on-board buffer and in a separate queue …
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Micro-electromagnetic formation flight of satellite systems
… to provide the forces to maintain a satellite's relative position in a formation. Thus far, high temperature superconducting (HTS) wire has been considered the enabling technology and the concept has been sized for aggressive maneuvering over large distances with concepts such as …
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Adaptive radio resource management for mobile satellite systems
… processing gain for adaptive CDMA algorithm in satellite system is introduced. The idea of the critical section in the downlink system when a user controller scheme has to be activated to improve the performance is initiated. The diversity technique and rate compatible punctured turbo-code …
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Modeling, Dynamics, and Control of Tethered Satellite Systems
Tethered satellite systems (TSS) can be utilized for a wide range of space-based applications, such as satellite formation control and propellantless orbital maneuvering by means of momentum transfer and electrodynamic thrusting. A TSS is a complicated physical system operating in a continuously …
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Rule-based system architecting of Earth observation satellite systems
… tradespace exploration of large complex systems that require a large body of expert knowledge. It physically separates the different bodies of knowledge required to solve a system architecting problem (i.e., knowledge about the domain, knowledge about the class of optimization or search …
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Analysis of large FDMA satellite systems for telephone services
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1980
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A subsampling delta-sigma modulator for global navigation satellite systems
Next-generation Global Navigation Satellite Systems (GNSS) receivers should be capable of processing multi-frequency signals in order to provide better positioning accuracy and signal availability to end-user. Nevertheless, the realization of such receivers with conventional receiver architectures …
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The generalized information network analysis methodology for distributed satellite systems
A systematic analysis methodology for distributed satellite systems is developed that is generalizable and can be applied to any satellite mission in communications, sensing or navigation. The primary enabler is that almost all satellite applications involve; the collection and dissemination of …
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The value proposition of distributed satellite systems for space science missions
… their goals due to budget limits. New methods in systems engineering have been developed to evaluate flexible systems and their sustained lifecycle value, but these methods are not yet employed by space agencies in the early stages of a mission's design. Previous studies of distributed satellite …
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Radio Wave Propagation Measurements and Modeling for Land Mobile Satellite Systems
The performance of a mobile satellite communications link is conditioned by the characteristics of the propagation path between a satellite and mobile users. The most important propagation effect in land mobile satellite system is roadside attenuation of the signals due to vegetation or urban …
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State Omniscience for Cooperative Local Catalog Maintenance of Close Proximity Satellite Systems
… related work has focused on the design of such systems under varying assumptions on the graph topology with simplified information fusion schemes. Contrarily, this work introduces characterizations of state omniscience under generalized graph topologies and generalized information fusion …
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Time Diversity Modelling and Implementation for Broadcast Satellite Systems at V-band
Deployment of commercial satellite networks at higher frequency bands such as the Ka and V-band has become essential to meet an increasing demand for high data rate multimedia services. Satellite systems operating at high frequency bands offer large bandwidth and are able to provide better quality …
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Global Navigation Satellite Systems as Signals of Opportunity for Environmental Applications: Reflectometry and Scintillation
L'abstract è presente nell'allegato / the abstract is in the attachment
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A multiobjective, multidisciplinary design optimization methodology for the conceptual design of distributed satellite systems
… for mathematically modeling the distributed satellite system (DSS) conceptual design problem as an optimization problem has been developed to advance the state-of-the-art in complex distributed satellite network design. An increasing number of space missions are utilizing DSS architectures in …
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Assessing future growth potential of mobile satellite systems using a cost per billable minute metric
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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An analysis of long-term agreements with suppliers in Lockheed Martin's commercial satellite systems division
Lockheed Martin designs and builds commercial satellites to customers' specifications. The customers, such as telecommunications companies and weather forecasters, are very price sensitive and, usually, award contracts to the lowest priced bids. Lockheed manufactures satellites using a combination …
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Using Random Sampling Consensus (RANSAC) to Detect Errors in Global Navigation Satellite Systems (GNSS) Signals and Data
… at an identified time. A global navigation satellite system (GNSS) uses the PNT signal to provide satellite-based navigation. Advanced receivers can track multiple GNSS constellations simultaneously. In order to have a robust and accurate solution, a user needs to detect any faulty …
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Assessing the technical and financial viability of broadband satellite systems using a cost per T1 minute metric
… (T1) link per minute metric is developed for systems evaluation of satellite based broadband communications systems. Global market models based on Internet growth and computer penetration are developed. Initially systems are limited by the available market, however as the market increases, the …
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