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 23 for “"Detect and Avoid"”.
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Implementation Of Path Planning Methods To Detect And Avoid GPS Signal Degradation In Urban Environments
… that cause scintillation, multi-path, and shadowing. These effects that decrease the GPS functionality can deteriorate the accuracy of GPS positioning causing losses in signal tracking leading to a decrease in navigation performance. These effects are modeled into the simulation …
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An Exploration of the Acoustic Detection and Localization of Small Uncrewed Aerial Systems
… (sUAS) in the airspace, the need for robust Detect and Avoid (DAA) technologies is clear. This is especially true when considering the potential for non-cooperative aircraft with unknown intent. Many UAS use high resolution cameras to perform omnidirectional scans of their nearby airspace to …
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Oviposition Site Selection By Mosquitoes: Predator-Released Kairomones And Responses To Different Taxa
… use to assess sites is critical to understanding life history traits, community structure, and species interactions. Mosquitoes are excellent model organisms for studying oviposition site selection for numerous reasons: 1) a poor decision can lead to zero reproductive success, 2) females …
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Demonstrating an Equivalent Level of Safety for sUAS in Shielded Environments
… current proposed unmanned aircraft system (UAS) detect and avoid standards require the same safety metrics, even when in close proximity to the ground or structures. This requirement has the potential to hinder low altitude small unmanned aircraft operations, such as local package delivery and …
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Value of Machine Learning and Cognition on Target Tracking
… spectrum has been opened to civilian and industrial access in the United States. Because of this, high priority users such as the military and government need to develop systems that can adapt to the surrounding spectral environment which will suddenly be filled with new users. This …
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RFID anti-collision technique: coherent collision
… industry. Shipping, warehouse inventory, and storefront security are just a few examples where the application of RFID systems has increased efficiency and lowered cost. A major area of research at the present time is concerned with optimal ways of reading multiple ID tags using a single …
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Multi-Sensor, Fused Airspace Monitoring Systems for Automated Collision Avoidance between UAS and Crewed Aircraft
… Aircraft Systems (UAS) beyond the pilot in command's visual line of sight is currently restricted due to a lack of cost-effective surveillance sensors robust enough to operate in low-level airspace. The current sensors available either have have high accuracy of locating targets but are too …
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Small UAV Trajcetory Prediction and Avoidance using Monocular Computer Vision
… unmanned aircraft systems (UAS) must be able to detect and avoid conflicting traffic, an especially challenging task when the threat is another small UAS. Collision avoidance requires trajectory prediction and the performance of a collision avoidance system can be improved by extending the …
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Visualizing Memory Utilization for the Purpose of Vulnerability Analysis
… prompted a need to develop new ways to classify, detect, and avoid vulnerabilities. The effectiveness of these goals relies on the development of new methods and tools that facilitate the process of detecting vulnerabilities and exploits. This thesis presents the development of a tool that …
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Development of a Peripheral-Central Vision System to Detect and Characterize Airborne Threats
… the malicious use of these systems. The airborne detect-and-avoid (ABDAA) problem and the counter-UAS problem have similar sensing requirements for detecting and tracking airborne threats. In this dissertation, two image-based sensing methods are merged to mimic human vision in support of …
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A zero kernel operating system : rethinking microkernel design by leveraging tagged architectures and memory-safe languages
… of kernel bugs. These bugs are difficult to detect and avoid in memory-unsafe languages such as C. To mitigate such bugs, we build on top of an operating system written in a memory-safe language, Rust. Rust provides memory-safety guarantees while remaining as fast and flexible as other …
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Evaluation of Perspective and Coplanar Cockpit Displays of Traffic Information to Support Hazard Awareness in Free Flight
… dimensionality on the ability of pilots to detect and avoid air traffic conflict in a part-task flight simulation paradigm. Thirty certified flight instructors from the Institute of Aviation at the University of Illinois flew a series of trials using one of three cockpit display of traffic …
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High-Dimensional Motion Planning and Learning Under Uncertain Conditions
… sensor models, arbitrarily moving obstacles, and uncertain action consequences. For example, picking up and storing childrens toys is a simple task for humans. Yet, for a robotic household robot the task can be daunting. The room must be modeled with sensors, which may or may not detect all …
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A Tale of Two Butterflies: The Effect of Larval Social Environment and Circadian Rhythms on Mating Behavior in Bicyclus anynana and Heliconius hewitsoni
… sexual ornamentation to male-male competition; and, 2) when an organism courts, be it daily, monthly, or seasonally. Both aspects are especially important for gregarious species as mistakes in either can incur high costs to overall fitness. My research focuses on using butterflies to explore kin …
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Ontogenetic Changes and Environmental Hypoxia: Responses of Two Fish Species to Low Oxygen Concentrations at Early Life Stages
… of fish (fathead minnows (Pimephales promelas) and rainbow trout (Oncorhynchus mykiss)) exposed to low dissolved oxygen concentrations at different ages during the first 100 days post-hatch. The changes in oxygen requirements and respiratory patterns that occur during ontogeny and exposure to …
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The lethal and sublethal effects of aldicarb on the estuarine grass shrimp, Palaemonetes pugio
… was placed on the quantification of the lethal and sublethal effects of aldicarb on three different life stages of P. pugio. Acute 96-h toxicity tests were conducted with newly hatched larvae, 22-d old larvae and adult grass shrimp to determine lethal toxicant ranges. LC₅₀ values were 85.0 ug/L …
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The Genetics Of Mosquito Heat-Seeking Behavior
… is a highly dynamic feature of the world, and one that deeply affects living things. Organisms have evolved sophisticated sensory-motor systems to detect and avoid excessive heat or cold—a behavior termed thermotaxis. In rare cases, however, animals use thermosensation not only to regulate …
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Contributions to deconfliction advanced U-space services for multiple unmanned aerial systems including field tests validation
… airspace is expected to increase from a few thousand to hundreds of thousands by 2050. To prepare for this approaching, national and international organizations involved in aerial traffic management are now developing new laws and restructuring the airspace to incorporate UAS into civil airspace. …
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Data-Driven Modeling of Pedestrian Crowds
… oriented towards computer simulations and on evacuation experiments. Since then, there have been many studies on new methods for extracting empirical data of pedestrian movements (mainly based on video analysis, lasers, and infrared cameras), but most of the work is still focused on …
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