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 11 of 11 for “"positional error"”.
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Geostatistical Models for Exposure Estimation in Environmental Epidemiology.
… measured precisely, and are therefore subject to positional error. We demonstrate that ignoring positional error results in biased predictions with misleading prediction errors. In the third paper, we consider models for multivariate exposures, concentrating on the bivariate case. We review and …
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Positional accuracy of the Wide Area Augmentation System
… of approximately 10 to 15 meters (average error). An attractive option for differential correction for these GPS units is the Wide Area Augmentation System (WAAS). Most consumer-grade GPS units on the market are WAAS capable. According to the FAA, the WAAS broadcast message provides …
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An analysis of technical standards for cadastral field surveys and considerations for the development of a model law
… the quality of a survey. It inspects the positional error concept as it applies to survey standards. It outlines and discusses the components which are vital to the viability of any technical standard and which should be considered ultimately in any model act.
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Radar and LiDAR Fusion for Scaled Vehicle Sensing
… the scaling factor into consideration, the RTS' positional error at small scale was, on average, over 5 times higher than in the full-scale trials. Third, LiDAR object sensor tracks were generated for the small-scale trials using a Velodyne PUCK LiDAR, a simplified point cloud clustering …
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Relative Position Control for Satellite Formation Flying
… on designing and evaluating different relative positional controllers for satellite formation flying. The objective is to establish a methodology that facilitates effective relative control across a broad range of formation flying missions without dictating actuator models specific to a given …
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Experimental Investigations into the Accuracy and Precision of Material Extrusion Additive Manufacturing
… do not conform to specification and trial-and-error approaches are often employed instead. Given these limitations, improvements to the process would help increase the proliferation of the technology and maximise potential benefits. The existing capability of the ME AM process was first …
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Perception-based synthetic cueing for night-vision device rotorcraft hover operations
… The perceptual gains examined were aircraft positional error along the three translational axes. A hover cue set was developed based on an analogue of a physical target used in a flight handling qualities tracking task, a perceptual task analysis for hover, and fundamentals of human spatial …
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Design of a Precision Needle for Injection of Fluid into the Suprachoroidal Space of the Eye for the Treatment of Retinal Detachment
… tissues are very thin, leaving little room for positional error. Hemorrhage may occur if the needle punctures through the choroid and into the subretinal space, which could lead to bad outcomes. This work presents a device developed to minimally invasively reach posterior segments of the eye, …
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Modeling Error in Geographic Information Systems
… is very important to observe and account for the error that is unavoidable in computerized maps. Currently, both statistical and non-statistical models are available to do so, although there is very little implementation of these methods. In this dissertation, I have focused on improving the …
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The role of obscured activity in galaxy formation
… at z=2.2. An analysis of sources within the positional error circles of unidentified SMGs identifies a population of likely counterparts with a redshift distribution that peaks at z=2.5\pm0.3 and likely comprises ~60% of the unidentified SMGs. The remainder are not detected in our IRAC …
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Developing GIS analysis techniques for the measurement of safe drinking water access
… census districts) was essential. Consequently, positional error relevant to DHS GPS clusters was detected, validated, measured and modelled. Selection criteria were developed for choosing the index components and a method for scoring these components was implemented. This was followed by …