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 202 for “"Clutter"”.
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Sea clutter simulation
… the aim of which was the prediction of sea clutter characteristics including the temporal properties of the return signals as observed by a maritime surveillance radar system. The compound K distribution model used to generate clutter amplitude statistic enables the simulation of sea clutter …
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Target detection in clutter for sonar imagery
This thesis is concerned with the analysis of side-looking sonar images, and specif- ically with the identification of the types of seabed that are present in such images, and with the detection of man-made objects in such images. Side-looking sonar images are, broadly speaking, the result of the …
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Improved Intermittent Clutter Filtering For Wind Profiler Radar
… measurement errors. A specific difficulty are clutter echoes from various airborne objects, such as aircraft or birds, which generate strong, intermittent contributions to the received signal. The standard RWP signal processing is not able to deal with these signals in an efficient way, because …
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Site specific radar coverage and land clutter modelling
… of a site specific radar coverage and land clutter modelling tool. Various sources of digital elevation model (DEM) and land cover (LC) data were investigated. It was found that the ASTER GDEM and SRTM 30 m DEM datasets can be used to characterise land topography for all intended areas of …
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Study of Visual Clutter in Geographic Node-Link Diagrams
… major issue of this visualization is the visual clutter of nodes or edges, defined in literature as ``the state in which excess items, or their representation or organization, lead to a degradation of performance at some task''. In particular, nodes and links may cause occlusion and ambiguity in …
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A clutter power computation procedure for airborne Doppler radar
… a general procedure for estimating the average clutter power received by an airborne Doppler radar as a function of time and frequency. Its purpose is to construct the received power waveform at the output of a matched filter for use in the development of clutter maps related to Doppler signal …
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Weak narrow-band signal detection in multivariate non-gaussian clutter
… narrow-band signals in multivariate non-Gaussian clutter. The novelty of the detection scheme lies in the utilization of both the complex measurement and the multivariate non-Gaussian character of the clutter. Two clutter models are developed based on the available partial information. Model (I) …
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Developing an Augmented Reality Visual Clutter Score Through Establishing the Applicability of Image Analysis Measures of Clutter and the Analysis of Augmented Reality User Interface Properties
… comes at a cost of increasing the visual clutter of the users' field of view, which can increase visual search time, error rates, and have an overall negative effect on performance. Visual clutter has been studied for existing display technologies, but there are no established measures of …
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Visual Clutter Study for Pedestrian Using Large Scale Naturalistic Driving Data
… driving is a complex cognitive activity. Visual clutter analysis can be used to study the factors that affect human visual search efficiency and help design advanced driver assistant system for better decision making and user experience. In this thesis, we propose the pedestrian perception …
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Radar Space-Time Processing for Range-Folded Spread-Doppler Clutter Mitigation
… due to ambiguous range foldover from distant clutter echos seriously degrades target detectability. For the case of skywave HF over-the-horizon (OTH) radar, ionospheric motion causes spreading of surface clutter in Doppler space and coupled with range folded clutter, introduces the effect of …
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Nuevas técnicas para la mitigación de clutter de aerogeneradores en radares meteorológicos
… los aerogeneradores eólicos son vistos como clutter, dado que tienen una fuerte influencia en los productos meteorológicos tales como la estimación de la intensidad de lluvia o la velocidad del viento. En los últimos años se han presentado diversos estudios del impacto de los aerogeneradores …
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DesignEye : a tool for design teams to analyze and address visual clutter
… Science Group at MIT. Our tool computes the clutter of images and identifies the most salient visual elements, and allows designers to work with the softare in a tight iterative feedback loop to ensure that the most important design elements garner the most end-user attention. DesignEye is …
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Detección adaptativa para radares de alta resolución. Análisis con datos experimentales de clutter
… dos de ellos: la compleja estadística del clutter de alta resolución, potencialmente no-gaussiano, no-estacionario y heterogéneo espacialmente, y la necesidad de gestionar adecuadamente el hecho de que los blancos pasan a ser extensos, distribuyéndose su energía en varias celdas de …
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Contribución a la detección no paramétrica de la señal radar con clutter no gaussiano
… en procesado digital de señales y en modelado de clutter de los últimos años, las simulaciones realizadas en el ordenador de los detectores radar son, además de fiables, posibles de llevar a cabo en un tiempo razonable, útiles y baratas. El clutter del sistema radar en un entorno marino (observado …
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Remote Vibration Estimation Using Displaced Phase Center Antenna SAR in a Strong Clutter Environment
… micro-Doppler e\ufb00ect, all while in a high clutter environment can provide strategic information for target identi\ufb01cation and target condition/status. This thesis discusses one method that processes the non-stationary signal of interest generated by the vibrating target in displaced …
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Random sampling as a clutter reduction technique to facilitate interactive visualisation of large datasets
… before the visual display becomes overcrowded or cluttered, hence potentially important information becomes hidden. The main theme of this work is to investigate the use of dynamic random sampling for reducing display clutter. Although randomness has been successfully applied in many areas of …
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The Competitive Front-of-Package Labeling of Consumer Packaged Goods: Cutting Through The Clutter
<p>At no point in U.S. history have food product packages displayed so many symbols and statements regarding nutrition and health benefits (Nestle 2010). However, despite this explosion of front-of-package (FOP) health communications, obesity and health-related problems of U.S. consumers continue …
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Spatial filter performance on point-target detection in various clutter conditions using visible images
… system, detection of point targets in clutter is a challenge because spatial noise in an image can be much greater than temporal noise. Suppression of clutter uses a spatial filter matched to the target size. The goal of filtering is to reduce the spatial noise to the temporal noise …
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Investigation of potential industrial uses for tools assessing saliency and clutter of design features
… DesignEye creates maps of saliency and clutter within an image, which can be used by designers to find problem areas in a design. The experiment described here tested how subjects differ in their analysis of existing UT designs when they have also been given access to maps from …
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