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 22 for “"Lidars"”.
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Characterization and Helicopter Flight Test of 3-D Imaging Flash LIDAR Technology for Safe, Autonomous, and Precise Planetary Landing
Two flash lidars, integrated from a number of cutting-edge components from industry and NASA, are lab characterized and flight tested under the Autonomous Landing and Hazard Avoidance (ALHAT) project (in its fourth development and field test cycle) which is seeking to develop a guidance, …
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Autonomous Vehicle Perception Quality Assessment
… requirement for AVs, with cameras and LiDARs being commonly used sensors for environmental understanding and localization. However, there is a research gap in assessing the quality of AVs perception systems. To address this gap, this dissertation proposes a novel paradigm for evaluating …
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Estimating atmospheric boundary layer turbulence in the marine environment using lidar systems with applications for offshore wind energy
… One type of remote sensing instrument, Doppler lidars, have shown to reliably estimate the wind speed and atmospheric turbulence while being cost effective and easily deployable, and hence are being increasingly utilized as a standard for wind energy assessments. In this thesis, the ability of …
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Estimating atmospheric boundary layer turbulence in the marine environment using lidar systems with applications for offshore wind energy
… One type of remote sensing instrument, Doppler lidars, have shown to reliably estimate the wind speed and atmospheric turbulence while being cost effective and easily deployable, and hence are being increasingly utilized as a standard for wind energy assessments.
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Diameter Estimation of Eucalyptus spp. Plantations in Southern Brazil Using Global Ecosystem Dynamics Investigation Data and Support Vector Regression
… with broad implications for using space-borne lidars to monitor carbon accretion in secondary forest plantation.
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Underwater simulation and mapping using imaging sonar through ray theory and Hilbert maps
… its sensor, i.e. sonars. In contrast to lasers (LIDARs), sonars are unprecise high-noise sensors. Besides its noise, imaging sonars have a wide sound beam effectuating a volumetric measurement. The first part of this dissertation develops an underwater simulator for highfrequency single-beam …
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Mobile Multi-Bounce LiDAR
… SPAD hardware to consumer-grade mobile LiDARs. First, we enable single-shot capture of two-bounce signals and remove the need for laser scanning by developing a tomographic formulation for two-bounce non-line-of-sight imaging. Second, we enable real-time non-line-of-sight capture at …
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THE OBSERVED VARIATION OF COHERENT UPDRAFT OBJECTS WITH HEIGHT IN THE CONVECTIVE BOUNDARY LAYER
… updrafts recorded with a network of five Doppler lidars in Oklahoma, USA on days with clear and cumulus topped boundary layers. We present the composite evolution of these updraft objects as a function of height, which reveal a mixture of plume-like and thermal-like objects. The results indicate …
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Designing Visual Intelligence from Photons to Action
… non-line-of-sight imaging. Using single-photon LiDARs, we capture the temporal propagation of individual photons, enabling the detection of objects around corners. This sensing capability allows us to develop robots that effectively anticipate and avoid hidden obstacles, reducing navigation time …
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A systems architecture framework towards hardware selection for autonomous navigation
… increases cost by only 4%. It is also found that LiDARs are critical to the performance and resilience of sensing systems in many different environments. A systems model for processor and bus selection is then developed, in order to minimize cost and latency of the hardware architecture, taking …
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Vector Distance Transform Maps for Autonomous Mobile Robot Navigation
… environments using a series of sensors including LiDARs and cameras. We propose an information filtering based approach for mobile robot localization where a single endpoint range sensor can be used to accurately localize a mobile robot in motion by rotating it in a direction that will improve its …
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Vision-based dynamical systems and learning
… with range measurement devices like radars and LIDARs. Furthermore, the collision avoidance is guaranteed using Lyapunov analysis type of technical arguments and illustrated using simulations. In the second part of this dissertation, a formal methodology for describing and designing activation …
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Methodology development and evaluation of automotive LiDAR performance in rain
… affecting the vision of time-of-flight (ToF) LiDARs, including vehicle soiling conditions and dynamics on various automotive surfaces. The approach to solving these problems involves three major areas of development and investigations: (1) develop methods for testing soiling in a controlled …
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A Scanning Bi-static SODAR
… energy. The commonly used mono-static SODARs and LIDARs rely on a horizontally homogeneous wind field to accurately measure wind speeds. Bi-static SODARs present a promising alternative instrument for measuring inhomogeneous wind fields, since their geometry, with separated transmitter and …
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Multi-criteria design analysis of sensor systems for railway level crossings
… by 36% if a combination of stereo cameras and LIDARs are used, however the cost of such two-sensor systems increases by four folds. A system safety analysis was also performed, and transportation safety from the viewpoint of not only sensors but also the larger system that includes humans was …
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Articulated pose estimation via over-parametrization and noise projection
… and milliradians in the case of planar LIDARs data and about 1 cm and 1 degree for 6-DOF RGB-D cameras. Second, we develop a particle filter to track an articulated object. Unlike most previous work, the algorithm accepts a kinematic description as input and is not specific to a …
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Field Evaluation of Doppler LIDAR Sensors for Early Assessment of Track Instability
The primary purpose of this study is to evaluate the use of Doppler Lidar sensors for assessing track weakening that would indicate early stages of track instability. Such track weakening could lead to gage widening or track buckling due to rail thermal expansion. A series of tests are performed at …
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Three-dimensional water vapor retrieval using a network of scanning compact microwave radiometers
… sensors on radiosondes and remotely using lidars, GPS ground-based networks, CPS radio occultation from satellites and a relatively small number of space-borne microwave and infrared radiometers. In-situ radiosonde measurements have excellent vertical resolution but are severely limited in …
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Microphysical retrieval of non-spherical aerosol particles using regularized inversion of multi-wavelength lidar data
… type, and radiative forcing. Highly advanced lidars (light detection and ranging) have reduced aerosol monitoring and optical profiling into a routine process. Lidar data have been widely used to retrieve the size distribution through the inversion of the so-called Lorenz-Mie model (LMM). This …
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Mapping of complex marine environments using an unmanned surface craft
… extensive sensor suite that includes three SICK lidars, a Blueview MB2250 imaging sonar, a Doppler Velocity Log, and an integrated global positioning system/inertial measurement unit (GPS/IMU) device. The data from these sensors is processed in a hybrid metric/topological SLAM state estimation …
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