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 16 of 16 for “"Air-to-Ground"”.
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Spatial tracker for an air-to-ground laser communication link
… hardware components of a spatial tracker for an air-to-ground laser communication system; these include a PWM switching amplifier and the control systems for driving the primary steering and tracking elements required in the acquisition and maintenance of an optical communication link. The …
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Radio Channel Measurements and Modeling for Smart Antenna Array Systems Using a Software Radio Receiver
… software-defined receiver was developed to serve as a test bed for wideband measurements and antenna array experiments. This receiver was used to perform vector channel measurements in terrestrial and air-to-ground environments using an antenna array. ent results served as input to radio …
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Triggered infrared emitter displays for individual identify friend-or-foe (IIFF) and vehicular mounted indentify friend-or-foe (VMIFF) devices.
… on flexible substrates, have been evaluated to determine range of activation and observation, performance under extreme environmental conditions, and emitter intensity decay as a function of multiple activations and time. Key results include observation at distances in excess of 700 meters …
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Self-Reconfigurable Unmanned Aerial Vehicle Networks for Wireless Communication Provisioning
… network and effectively act as access points to serve users. In disaster-hit areas, providing communication through infrastructure is impossible due to either time constraints or impracticable ground conditions. UAVs can be promptly deployed in such scenarios, forming a mesh network and …
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Intelligent order scheduling and release in a build to order environment
… sub-components from local warehouses according to the manufacturing schedule, just-in-time manufacturing of custom configured computer systems including hard-drive image and custom software download, packaging the unit for delivery, order accumulation, and finally, distribution and shipping to …
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UAV Communications: Spectral Requirements, MAV and SUAV Channel Modeling, OFDM Waveform Parameters, Performance and Spectrum Management
Unmanned Aerial Vehicles (UAV) are expected to be deployed both by government and industry. Rules for integrating commercial UAVs into a nation's airspace still need to be defined, safety being the main concern. As part of this thesis, the communication needs of UAVs as important requirement for …
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Drone Cellular Networks: Fundamentals, Modeling, and Analysis
… appealing for a variety of applications due to their rapid and flexible deployment, cost-effectiveness, and high chance of forming line-of-sight (LoS) links to the ground nodes. As with any new technology, the benefits of incorporating UAVs in existing cellular networks cannot be …
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Development and Evaluation of a Modified VFR Lighted Flyway Marker
In air-to-ground visual search, size and color are the most important factors during daytime observations. Several testing schemes were developed to evaluate the effects of colors, color combinations, marking patterns, and size on the perceptibility of an object. Based upon these results, a …
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The guided samara : design and development of a controllable single-bladed autorotating vehicle
Accurate delivery of cargo from air to ground is currently performed using autonomously guided parafoil systems. These parafoils offer limited maneuverability and accuracy, and are often relatively complex systems with significant deployment uncertainty. The author has proposed, designed, and …
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Propagation models for multiple-antenna systems : methodology, measurements and statistics
The trend in wireless communications is towards utilization of multiple antenna systems. While techniques such as beam-forming and spatial diversity have been implemented for some time, the emergence of Multiple-Input Multiple-Output (MIMO) communications has increased commercial interest and …
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Enhancing Performance of Next-Generation Vehicular and Spectrum Sharing Wireless Networks: Practical Algorithms and Fundamental Limits
… cellular/wireless local area networks (WLAN), into a wide range of applications, such as the Internet-of-Things (IoT), vehicular-to-everything (V2X), and smart grid communication networks. This transition has been facilitated by research and development efforts in academia and industry, which has …
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Adaptive Radar with Application to Joint Communication and Synthetic Aperture Radar (CoSAR)
… functionality of radar systems has been built into the radar's analog hardware, resulting in radars which are inflexible and that can only be used for a specific application. Modern systems, however, driven by the ever increasing speed of processors and data converters - analog-to-digital (ADC) …
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An experimental determination of the effects of image quality on eye movements and search for static and dynamic targets
An important problem for the human factors specialist involves specifying the extent to which the quality of a displayed image will affect observer performance. One approach to this problem has been to develop metrics of image quality and to correlate measured image quality with observer …
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Machine Learning for Millimeter Wave Wireless Systems: Network Design and Optimization
… will rely on millimeter wave (mmWave) bands to meet the increasing demand for wireless connectivity from end user equipment. Given large available bandwidth and small-sized antenna elements, mmWave frequencies can support high communication rates and facilitate the use of …
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UAV-Enabled Wireless Communications: Deployment, Optimization, and Analysis
… relays, in wireless communications systems. Due to their high likelihood of line-of-sight (LoS) links and ease of deployment, they play a crucial role in providing faster and better wireless network access and service where extra network resources are needed short term, like sports events, or to …