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 247 for “"UAS"”.
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Sizing Tool for Quadrotor Biplane Tailsitter UAS
The Quadrotor-Biplane-Tailsitter (QBT) configuration is the basis for a mechanically simplistic rotorcraft capable of both long-range, high-speed cruise as well as hovering flight. This work presents the development and validation of a set of preliminary design tools built specifically for this …
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Assessment of Asymmetric Flight on Solar UAS
<p>An investigation was conducted into the feasibility of using an unconventional flight technique, asymmetric flight, to improve overall efficiency of solar aircraft. In this study, asymmetric flight is defined as steady level flight in a non-wings-level state in- tended to improve solar incidence …
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Multirotor UAS Sense and Avoid with Sensor Fusion
… autonomous Unmanned Aircraft Systems (UAS) are explored including obstacle detection, dynamic obstacle state estimation, and avoidance strategy. This area is explored in pursuit of determining the viability of UAS Sense and Avoid (SAA) in static and dynamic operational environments. …
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Machine Learning for Unmanned Aerial System (UAS) Networking
… the simplification of Unmanned Aircraft System (UAS) enable the UAS networking deployment on a large scale to become feasible. The UAS networking can finish multiple complex missions simultaneously. However, the limitations of the conventional approaches are still a big challenge to make a …
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Cognitive UAS Path-Planning for Large Spatial Search
Search and Rescue/Destroy missions are some of the most high-risk situations in modern engineering. Every mission nearly always presents a life or death scenario for one or more individuals, with the penalty for failure often being human lives. Modern Search and Rescue/Destroy missions implement …
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Modeling and Testing Powerplant Subsystems of a Solar UAS
… design of solar powered Unmanned Aerial Systems (UAS), it is necessary to have a thorough understanding of the systems involved. In particular, it is desirable to have mathematical models and analysis tools describing the energy income and expenditure of the vehicle. Solar energy income models may …
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A Carrier-Pigeon UAS for South Pole Data Transfer
… of feasibility of an Unmanned Aircraft System (UAS) that is specifically tailored—in performance, operating and support characteristics, and payload—to support hardware-based data transfer from South Pole Station in Antarctica to a location of high connectivity has been undertaken. Due to the …
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Performance characterization of the multirotor UAS chemical application system
UAS (Unmanned Aerial Systems) have been employed as agro-chemical applicators in agriculture for micro-field applications in Japan, in the form of gas-powered helicopters. A recent surge in battery-powered multirotor UAS has provided a cheaper, more reliable platform that is much simpler to …
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ANC of UAS Rotor Noise using Virtual Error Sensors
… For example, as small unmanned aerial systems (UAS) become more commonly used, community noise exposure also increases, along with the desire to reduce UAS noise. Traditional ANC systems that rely on physical sensors at observer locations are impractical, since a UAS does not typically have …
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Application of multiple unmanned aircraft systems (UAS) for bushfire mitigation
… will soon allow Unmanned Aircraft Systems (UAS) to be flown alongside manned aircraft in non-segregated airspace. This research thesis explores how the simultaneous deployment of a low altitude UAS along with a high medium altitude UAS in different airspaces can aid bushfire mapping and …
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Toward a Framework for Systematically Categorizing Future UAS Threat Space
… concerns predictions made with respect to the UAS threat space in the future. These predictions are designed to allow for defensive systems to be developed with a high expected effectiveness against current and future threats. Essentially this work comprises a first attempt toward developing a …
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An Innovative Human Machine Interface for UAS Flight Management System
… of an innovative Human Machine Interface for UAS Flight Management System. In particular, touchscreena have been selected as data entry interface. The thesis has been done together at Alenia Aermacchi.
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Collision Avoidance and Navigation of UAS Using Vision-Based Proportional Navigation
<p>Electro-optical devices have received considerable interest due to their light weight, low cost, and low algorithm requirements with respect to computational power. In this thesis, vision-based guidance laws are developed to provide sense and avoid capabilities for unmanned aerial vehicles …
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Implementation of Virtual Reality With Unmanned Aerial System (UAS) Traffic Management
… on the implementation of virtual reality with a UAS Traffic Management (UTM) system. This system is based on a notional architecture for future development in air traffic management with smaller unmanned aircraft. This implementation aims to explore the viability of using VR to enhance users' …
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U.S. Airspace Integration: Perspectives of the FAA UAS Test Site Program
In an effort to integrate unmanned aircraft into the national airspace system, congress mandated action by the Federal Aviation Administration under the Federal Aviation Administration Modernization and Reform Act of 2012. It required the formation of six test sites that would conduct unmanned …
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UAS as an Inventory Tool: A Photogrammetric Approach to Volume Estimation
<p>Unmanned aircraft systems (UAS), also referred to as unmanned aerial vehicles (UAV) or remotely piloted vehicles (RPV), are associated with unmanned aircraft either controlled by a pilot on the ground or pre-programmed with specific flight paths. Small UASs have seen a massive increase in public …
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Modelling, simulation and performance evaluation: PEM fuel cells for high altitude UAS
… as a potential power source for high altitude UAS (unmanned aircraft systems) operations. At altitudes in excess of 10 km, very low atmospheric temperatures and pressures, and unexpected variations in the load demand put severe stresses on the operation and performance of PEM fuel cells. A …
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Investigating collision avoidance for small UAS using cooperative surveillance and ACAS X
Small Unmanned Aircraft Systems (sUAS) have proliferated over the last decade. While these platforms offer many benefits to society, they pose a dangerous mid-air collision hazard. In order to safely integrate into airspace shared by other users, sUAS must be able to avoid collisions with manned …
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Involuntary Signal-Based Grounding of Civilian Unmanned Aerial Systems (UAS) in Civilian Airspace
… grounding of civilian unmanned aerial systems (UAS) in unauthorized air spaces. The technique proposed here will forcibly land unauthorized UAS in a given area in such a way that the UAS will not be harmed, and the pilot cannot stop the landing. The technique will not involuntarily ground …
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