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 76 for “"satellite communications"”.
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Advanced random access techniques for satellite communications
… thesis, Advanced Random Access techniques for Satellite Communications are studied. In the last years, new advances in multi-access communication protocols together with the increasing need for bidirectional communications in consumer type of interactive satellite terminals have revived the …
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Application of Revenue Management to Satellite Communications
As the demand for satellite Internet continues to grow, satellite communication (SatCom) operators are faced with the challenge of effectively managing their capacity sales. While Revenue Management (RM) techniques have been widely used in other industries such as airline, hotel, and car rental …
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Statistical modeling for land mobile satellite communications
The Land Mobile Satellite System (LMSS) to be available in the 1990 time frame will provide connection between mobile vehicles and the conventional terrestrial communication network. The design is dependent on the propagation characteristics of the land mobile satellite signal. Unlike fixed …
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Propagation modeling for land mobile satellite communications
Satellite systems are being planned for two-way communication with mobile vehicles using UHF and L-band frequencies. Of special concern in the system design are the characteristics of propagation in suburban and rural areas where fading occurs due to multipath effects and vegetative shadowing. A …
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A Propagation Simulator for Land Mobile Satellite Communications
The performance of a mobile satellite communications link can be determined by the propagation path between a satellite and mobile users. Some of the most important factors are multipath propagation and vegetative shadowing. System designers should have the most reliable information about the …
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Performance of dual polarized site diversity satellite communications systems
… Site diversity may be used in high frequency satellite communication systems to reduce the effects of attenuation and depolarization due to rain and ice. This thesis examines dual polarized site diversity satellite communication systems to determine how such systems would perform under …
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Development of waveguide filter structures for wireless and satellite communications
This thesis explores the possibilities of the design and realization of compact conventional and substrate integrated waveguide structures with improved performance taking advantage of recent cross-coupled resonator filters theory achievements such as the modular filter design approach using …
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Synchronization of system-of-systems interfaces in military satellite communications
… of one or more system of systems (SoS). Military satellite communications programs have expanded over the last decade from three distinct satellite constellations with dedicated ground, ship, and airborne terminals to several existing and planned satellite constellations and dozens of …
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Short-term traffic forecasting for a smart satellite communications system
Satellite communications systems are undergoing a modernization to efficient capacity allocation from a traditional "bent pipe" or static allocation. One challenge to address with a more precise usage of satellite resources is the change in user terminal traffic during a complete cycle of the …
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Performance evaluation of multimedia satellite communications systems using on-board packet switches
Satellite communications systems are ideally equipped to provide future multimedia services on a global level and at a distance-independent cost. In order to meet the ever-growing bandwidth demands of these new applications, satellites employing multiple spot beam antennas are required. An on-board …
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Evaluating the Strategic Intent and Competitive Dynamics of China’s Satellite Communications Constellations
… of China’s two flagship low Earth orbit (LEO) satellite megaconstellation programs, Guowang and Qianfan, in the context of the rapidly evolving global satellite communication (Satcom) market. Against the backdrop of SpaceX’s Starlink dominance and intensifying geopolitical competition, China’s …
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System Design of an Integrated Terrestrial-Satellite Communications Network for Disaster Recovery
… describes a possible integrated terrestrial-satellite network system for disaster recovery and response. The motivation of this thesis was based on the adjacent spectrum allocations between the Virginia Tech terrestrial Local Multiple Distribution Service (LMDS) system and a Ka-band satellite …
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Distributed satellite communications system design : first-order interactions between system and network architectures
… the introduction of exciting applications for communications services becomes ever more critical for the success - and in some cases, survival - of businesses and even nations. While the majority of these innovations have occurred over cable and fiber, a number of the most socially significant …
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The weight of an assassin's mace : vulnerabilities in the US military's satellite communications and China's information warfare threat
… a far-reaching, robust, ubiquitous ISR and telecommunications network, and a network-centered fighting doctrine are keys to this endeavor. Of the many systems needed, satellite communications are especially significant because they are the prime method of transmitting high quantities of …
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Airborne protected military satellite communications : analysis of open-loop pointing and closed-loop tracking with noisy platform attitude information
… assets' increasing need for secure global communications has led to the design and fabrication of airborne satellite communication terminals that operate under protected security protocol. Protected transmission limits the closed-loop tracking options to eliminate pointing error in the …
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Small scale antenna diversity as a means of reducing the effects of multipath fading for handheld satellite communications systems
… fading upon a circularly polarized L-Band satellite-to-handheld communications system using an omni-directional antenna. A significant finding was that motion of the satellite could induce fades of up to lOdB, well in excess of the small link margins available to satellite-to-handheld …
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A Study into the Tradeoffs Between TDM / MF-SCPC and TDM / MF-TDMA Transport Options to Support IP-Based Multimedia Applications Under Different Load Conditions Within a Point-to-Multipoint Satellite Network
… elements that are involved in geosynchronous satellite point-to-multipoint Internet Protocol (IP)-based multimedia communications design and also takes a deep dive into the analysis of a real-life scenario, using the TDM / MF-SCPC and TDM / MF-TDMA media access techniques. This thesis starts …
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Ss/tdma Time Slot Assignment With Generalized Switching Modes
… arise from the time slot assignment problem for satellite communications using the satellite-switched time division multiple access (SS/TDMA) method are studied. Given an m x n real matrix T, and a set of (0, 1)-matrices {Z(,1), Z(,2), (.)(.)(.) , Z(,(nu))}, the optimization problem we wish to …
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Applying Kuiper Connectivity with Edge Computing to New Industry Verticals
… comprising hundreds or even thousands of satellites in Low Earth Orbit (LEO) to provide global connectivity coverage have been a goal of satellite operators for decades. Within the last 5 years, these projects have become technically feasible due to advances in communications and launch …
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Perspectives on the satellite services industry : analysis of challenges and opportunities in the market, policy and regulatory environments
This thesis focuses on Space Communications and combines engineering, economics, market, and policy analyses to identify challenges and opportunities in the industry that are beyond the scope of any one isolated discipline. This work is divided in two parts. The first part begins by discussing the …
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