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 790 for “"lidar"”.
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Helium resonance fluorescence LiDAR
Recent advancements in LiDAR for atmospheric applications have allowed measurements to reach higher altitudes and have increased temporal resolu- tion. Increased output power, larger apertures, and higher efficiency detec- tors have made this possible. The helium resonance fluorescence LiDAR has …
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Mobile Multi-Bounce LiDAR
… SPAD sensors on mobile devices (e.g. iPhone Pro LiDAR) raises the potential to enable NLOS capabilities on consumer devices in the future. Currently, these sensors are primarily employed for LiDAR-based depth estimation, with untapped potential in other applications. In light of recent advances …
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Attitude Determination Using Imaging Lidar
… of control object using a new technology called lidar (Light Ranging and Detection). As the number of spacecraft continues to grow, it is paramount to introduce a new type of autonomous on-orbit satellite inspection and repair involving docking. Traditional space vision technology is based on …
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Depth Correction++ for pseudo-LiDAR
… of autonomous vehicles. Researchers commonly use LiDAR data in 3D object detection, because it can provide accurate depth information. However, LiDAR sensors are expensive, which means it is not economical to use LiDAR sensors and data in real life. How- ever, using only cameras for 3D object …
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LIDAR design for space situational awareness
… Laser Imaging, Detection And Ranging (LIDAR) sensors to detect, track, classify or image other spacecraft. This Thesis explores the unique trade-spaces and design decisions faced by an engineer designing such a system. It provides an overview of the basic operational principles, the …
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Die eisenzeitliche Keramik von Lidar Höyük
… und Analyse der bei den Ausgrabungen auf dem Lidar Höyük (Südost Türkei) gefundenen Keramik der Eisenzeit. Voneinander getrennt werden Waren und Formen typologisiert und mit Bezugnahme auf die Stratigraphie in ein chronologisches Schema gebracht. Vergleichsfundorte aus weiten Teilen des …
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Characterizing vegetation structure using waveform LiDAR
… and vegetation interaction. Waveform airborne LiDAR data contains large amounts of vegetation structural information, and is the best tool available for providing detailed physical information for large areas of vegetation. In this thesis, we first provide a complete work flow that extracts and …
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An EM algorithm for Lidar deconvolution
Airborne Lidar is a range sensing method which is effective in determining ground terrain from a distance. However, the return signal we observe is a noisy, convolved distortion of the ground return. Deconvolution is one approach to restore the original ground return from the observed return …
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Mapping and Localization Using LiDAR Fiducial Markers
LiDAR sensors are essential for autonomous systems, yet LiDAR fiducial markers (LFMs) lag behind visual fiducial markers (VFMs) in adoption and utility. Bridging this gap is vital for robotics and computer vision but challenging due to the sparse, unstructured nature of 3D LiDAR data and 2D-focused …
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Techniques for low coherence pulsed Doppler lidar
… and the occasional death. The ability of a lidar system to make wind speed measurements and detect wind shear and turbulence has been known for some time. However, lidar systems are still not commercially viable as early warning systems in aircraft and at airports. The main reason is the …
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Airborne lidar observations of tropospheric arctic clouds
… the PhD, elastic backscatter and depolarization lidar observations of Arctic clouds were performed during the international Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) from Svalbard in March and April 2007. Clouds were probed above the inaccessible Arctic Ocean with a …
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Adaptation of VT-Dbr Lasers for LIDAR
… itself for general light detection and ranging (LIDAR) applications due to range limitations that arise from a finite laser coherence length. The goal of this thesis is to explore LIDAR applications for VT-DBR lasers and how to improve VT-DBR performance for LIDAR. In the scope of this work, …
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Novel DMD-based Lidar and Display Systems
… investigates four optical architectures, two for lidar applications and two for display applications, that deviate from the prescribed design forms. First, an imaging lidar system is presented that reverses the typical architecture: an illuminated field is imaged onto a DMD for spatial scanning …
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Integrated optical phased arrays for lidar applications
… we then, specifically focus on a, NPA based, lidar. These lidar systems are essential components in any autonomous system maneuvering in an undefined environment. An on chip lidar like this one can serve, for example, in the automotive industry for safety enhancement and to allow autonomous …
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Tracking Human Movement Indoors Using Terrestrial Lidar
… study, this research leverages 11 terrestrial lidar sensors to develop a dynamic digital model that continuously captures human activities within public spaces of the building. Three distinct object detection methodologies were evaluated: deep learning models, OpenCV-based techniques, and …
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Modification of the Naval Postgraduate School Lidar System
The Naval Postgraduate School (NPS) Lidar System was modified to allow comparison of lidar profiles with radiosonde profiles preparatory to evaluation of the lidar as a monitor for changes in the boundary layer. The detector package was modified to permit day and night operation and to reduce the …
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Lidar and infrared radiometer studies of stratocumulus clouds
… stratocumulus clouds measured by ground-based Lidar and Infrared RADiometry (or LIRAD). The clouds were measured in northwestern Tasmania in the winter of 1993 and summer of 1995 during the Southern Ocean Cloud Experiment (SOCEX). The study done for this thesis represents the first application …
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