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 “"Velocity estimation"”.
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Modelling of bio-inspired vision system for velocity estimation.
… extensively studied for over almost 40 years, velocity detection in insects and how the insect brain computes the velocity of a moving feature, independent of its size or contrast, is a major enigma that remains unsolved. This study examines the accuracy of velocity estimation using two …
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A method for on-line water current velocity estimation using low-cost autonomous underwater vehicles
… some capabilities such as water current velocity measurement traditionally requires the addition of equipment that is not only expensive, but also whose size and power consumption can adversely affect operating characteristics and deployment times. This thesis expands on previous research …
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A method for on-line water current velocity estimation using Lol-cost autonomous underwater vehicles
… some capabilities such as water current velocity measurement traditionally requires the addition of equipment that is not only expensive, but also whose size and power consumption can adversely affect operating characteristics and deployment times. This thesis expands on previous research …
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Design and Numerical Simulation of the Real-time Particle Charge and Size Analyser
… the simultaneous measurement of its size and velocity, the magnitude as well as the polarity of the particle charge can be obtained. Different signal processing systems in different excitation fields have been designed and implemented. These systems include: velocity estimation system using …
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Backscatter Spatial Coherence for Ultrasonic Image Quality Characterization: Theory and Applications
… wall filter selection. The relationship between velocity estimation accuracy and spatial coherence was demonstrated in simulations with varying flow and clutter conditions. This relationship was leveraged to implement a novel method for coherence-based adaptive wall filtering, which selects a …
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Fusion of Frequency and Spatial Domain Information for Motion Analysis
… are finding the number of moving objects, velocity estimation, object tracking, and motion segmentation. The proposed hybrid approach performs the motion estimation based on frequency-domain information, but also uses spatial information for precise object localization. Unlike existing …
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Current velocity profiling from an autonomous underwater vehicle with the application of Kalman filtering
… schemes for extracting Earth-referenced current velocity from relative current velocity measurement made by an Acoustic Doppler Current Profiler (ADCP) borne by an Autonomous Underwater Vehicle (AUV). Compared with conventional approaches, current profiling from an AUV platform has advantages …
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Analysing Dynamic Processes in Range Data Sequences
… is developed. This includes the instantaneous velocity field (range flow) of a deformable surface and local expansion rates. For the velocity estimation novel differential constraint equations for the depth and intensity data are introduced. These constraint equations are then combined in a …
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Reactive Motions In A Fully Autonomous CRS Catalyst 5 Robotic Arm Based On RGBD Data
<p>This study proposes a method to perform velocity estimation using motion blur in a single image frame along x and y axes in the camera coordinate system and intercept a moving object with a robotic arm. It will be shown that velocity estimation in a single image frame improves the system's …
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Applications of Distributed Temperature Sensing in Subsurface Hydrology
… The method allowed for the relatively quick estimation of velocities in the well. The use of heated fibre optics is then trialled, and through a field test was shown to be sensitive to in-well vertical flow. However, the data suffered from a number of artefacts related to the cable …
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An estimation-theoretic technique for motion-compensated synthetic-aperture array imaging
… the effect of a larger aperture array). From an estimation-theoretic perspective, this thesis addresses the following limitations of conventional imaging techniques for the spotlight-mode version of SAR: sidelobe imaging artifacts and loss of resolution for stationary SAR scenes containing …
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Velocity analysis in the presence of uncertainty
Velocity analysis resolves relatively long scales of earth structure, on the order of 1 km. Migration produces images with length scales (wavelengths) on the order of 10's of m. In between these two scale regimes lies another, corresponding roughly to structures between 60 to 300m in extent, in …
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Contrast-enhanced Doppler Ultrasound Imaging using Plane Waves
… contrast-enhanced ultrasound imaging enables low velocity perfusion to be detected and separated from the tissue echo, but has a limited ability to depict the vascular morphology within the perfused tissue. To date, it has been challenging to combine these two methods due to realistic imaging time …
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Investigation of Radar Interferometric Techniques With Application to the Atmosphere
… The zonal and vertical components of the drift velocity of distinct irregularity patches within the radar field of view are estimated using a combination of Doppler and image evolution information RII technique provides with temporal and spatial resolutions of a few seconds and kilometers, …
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Bone health in elite ballet dancers: a multidisciplinary approach
… Bone mass, nutrition, peak height velocity estimation, energy availability, insulin-like growth factor I (IGF-1), oestrogens, growth hormone, and sclerostin serum concentrations were longitudinally measured in a sub-sample of 101 vocational dance students and age- and sex-matched …
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Real-time control architecture for a multi UAV test bed
… performance are achieved estimating the linear velocity of the aerial robot and incorporating velocity lead-lag compensators to the control approach. The velocity of the aerial robot is computed by numerical differentiation of position data. Simulation results to a variety of input signals of …
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Free-surface turbulence and air-water gas exchange
… was developed that provides high accuracy velocity estimation with improved computational efficiency. This algorithm combines the concepts of dynamic Fourier-domain cross-correlation with a localized direct multiplicative correlation. In order to explore relationships between free-surface …
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Conceptual, algorithmic, and statistical exploration of relations between runoff generation, stream geomorphology, and watershed topography in West Texas
… Additive Model (GAM) for Stream Discharge and Velocity Estimation from Stream Geomorphology A discussion of work that was inspired by and resulted from discussions between the author and colleagues from various universities and from the U.S. Geological Survey (USGS) during and after the study …
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Suspension Controls and Parameter Estimation Using Accelerometer Based Intelligent Tires
… vehicle states like vertical load on tire, velocity of the vehicle, unsprung mass acceleration, and forces on a tire. All these estimations would be helpful in observing various parameters of a vehicle using data from only a tri-axis accelerometer inside the tire. Data was collected in an …
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The Design of a Low-Cost Traffic Calming Radar - Development of a radar solution intended to demonstrate proof of concept
… relate to the detection performance and the velocity accuracy of the proposed radar design, were met. This was done to save on buying all the components of the proposed system while proving the design's technical feasibility. The data-collection system consisted of a radar sensor, an Analogue …
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