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.
Results
Showing 1 to 20 of 84 for “"low-altitude"”.
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Low altitude unmanned aerial vehicles (UAVs) in wireless networks
… line-of-sight establishment, and adjustable altitude. The rapid evolution of 5G and beyond 5G networks, alongside advancements in miniaturization, control, computerization, and cost reduction in UAV manufacturing, has propelled UAVs into pivotal roles across industrial, commercial, and …
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Low altitude unmanned aerial vehicles (UAVs) in wireless networks
… line-of-sight establishment, and adjustable altitude. The rapid evolution of 5G and beyond 5G networks, alongside advancements in miniaturization, control, computerization, and cost reduction in UAV manufacturing, has propelled UAVs into pivotal roles across industrial, commercial, and …
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Orbit determination and prediction processes for low altitude satellites
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1980.
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Low altitude threat evasive trajectory generation for autonomous aerial vehicles
In recent years, high altitude unmanned aerial vehicles have been used to great success in combat operations, providing both reconnaissance as well as weapon launch platforms for time critical targets. Interest is now growing in extending autonomous vehicle operation to the low altitude regime. …
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Assessing multi-rotor UAV controllability in low altitude fine-scale wind fields
… may ultimately be useful in understanding the low level wind environment, for certification of vehicles, or for real-time monitoring of control authority.
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Computer vision-based post-disaster needs assessment from low altitude aerial imagery
… of damage. This thesis focuses on the following question: How can we use modern computer vision techniques to utilize CAP imagery for post-disaster needs assessment, specifically for the purpose of damage estimation and localization? This question is important because the data gathered by …
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Determining estuarine seagrass density measures from low altitude multispectral imagery flown by remotely piloted aircraft
… ebb waters from the surface of an estuary at low tide creates a mosaic of drying sediment, draining surface and static shallow pooling that has potential to interfere with spectral observations. The field surveys demonstrated that despite minor shifts in the spectral coordinates of seagrass …
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Guidance and control using model predictive control for low altitude real-time terrain following flight
… to nominal velocities. The mission objective of low altitude and high speed was met satisfactorily without terrain or obstacle collision, however, methods to preclude or deal with infeasibility must be investigated as terrain severity (measured by commanded flight path angle) is increased past 30 …
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The Phase Gradient Autofocus Algorithm with Range Dependent Stripmap SAR
… autofocus method. The PGA is restricted to high altitude aircraft. Since lower altitude SARs have significant range dependencies that cannot be ignored, the PGA could not be used. This thesis eliminates the high altitude restriction and extends the PGA for use with all spotlight SARs. The new …
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ADS-B benefits to general aviation and barriers to implementation
… yearly utilization for GA aircraft is 21 times lower than that of commercial aircraft. Since many benefits from ADS-B depend on aircraft utilization, concern exists that ADS-B does not provide enough user benefit to GA, possibly resulting in delayed acceptance and aircraft equipage with ADS-B …
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Methods for Radioactive Source Localization via Uncrewed Aerial Systems
… detection technology with UAS capable of flying low-altitude missions. This low-altitude scanning can be achieved by combining small and lightweight radiation detectors and state-of-the-art aircraft and avionics. High resolution mapping can then be conducted using the results of these scans. …
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Observed and Predicted Climate Change Impact on Water Resources of the Upper Indus Basin: English
… that can lead to seasonal variations in river flows. The water resources of the Upper Indus Basin (UIB) are highly dependent on the winter westerly disturbances (WWD) and summer monsoon systems. However, the impacts of change in this complex climate system vary spatially and temporally across …
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Observation and Interpretation of the Spectra of Atmospheric Gravity Wave Perturbations With Upward and Downward Phase Progressions
… phase perturbations originate from the same low-altitude gravity-wave sources.
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An adaptive image processing algorithm for field plant population analysis based on UAV imaging system
… vehicle (UAV). In the most recent research, low-altitude (under 10 m) drone images have been used to estimate plant density of wheat crops. New algorithms of plant counting have been proposed for low-altitude drone images. But the limitation is that low-altitude flights only cover small field …
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Application of multiple unmanned aircraft systems (UAS) for bushfire mitigation
… of sense-and-avoid systems 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 …
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Marine atmospheric influences on trace gas observations and transport during the ICARTT 2004 campaign
… the transit and evolution of trace gases in the lower marine atmosphere above the Gulf of Maine (GOM) and western North Atlantic Ocean. Part I advances a quasi-lagrangian case study of a plume emanating from the New York City source region. In this, analysis of airborne intercepts of the plume …
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A Study Evaluating if Targeted Training for Startle Effect can Improve Pilot Reactions in Handling Unexpected Situations in a Flight Simulator
… failure to make correct and timely decisions following a sudden and unusual event that startled the crew. This study sought to determine if targeted training could augment decision making during a startle event. Following a startle event cognitive function is impaired for a short duration of time …
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Topography as a determinant of range extent and overlap : a species level phylogenetic reconstruction and geographical range analysis of Syncarpha (Asteraceae)
… in which to investigate the relationship between altitude and species range extent, as well as explore the role of topography in speciation and current range overlap. I examined these questions in the context of Syncarpha, a genus within the Asteraceae tribe Gnaphalieae (paper daisies). A Bayesian …
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Effects of natural vegetation, fire and alien plant invasion on bird species assemblages in mountain fynbos of the southwestern Cape Province, South Africa
… of three animal taxa as seed predators following fire, the extent to which an indigenous bird species ate alien Acacia cyclops fruits, and potentially dispersed its seeds, and the number of nectarivorous birds which visited an isolated nectar resource. Avian responses to fire in Mountain …
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