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Dissertations / Theses on the topic 'Active sonar systems'

Author: Grafiati

Published: 29 June 2021

Last updated: 13 February 2022

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1

Ljung, Johnny. "Track Before Detect in Active Sonar Systems." Thesis, Uppsala universitet, Signaler och system, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447314.

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Detection of an underwater target with active sonar in shallow waters such as the Baltic sea is a big challenge. This since the sound beams from the sonar will be reflected on the surfaces, sea surface and sea bottom, and the water volume itself which generates reverberation. Reverberation which will be reflected back to the receiver, is strong in intensity which give rise to many false targets in terms of classifying a target in a surveillance area. These false targets are unwanted and a real target might benefit from these miss-classifications in terms of remaining undetected. It is especial

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2

Winter, Thomas A. "Examination of time-reversal acoustic application to shallow water active sonar systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA378874.

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Carper, Scott Adams. "Low frequency active sonar performance in the Arctic Beaufort Lens." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113758.

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Thesis: S.M. in Oceanographic Engineering, Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Mechanical Engineering; and the Woods Hole Oceanographic Institution), 2017.<br>Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science; and the Woods Hole Oceanographic Institution), 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 885-86).<br>A newly discovered double ducted acoustic environment present throughout much of the Beaufort Sea in the

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Hassan, Marwa M. "Framework for active solar collection systems." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28048.

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A framework that presents a new methodology for design-evaluation of active solar collection systems was developed. Although this methodology emphasizes the importance of detailed modeling for accurate prediction of building performance, it also presents a process through which the detailed modeling results can be reused in a simplified iterative procedure allowing the designer the flexibility of revising and improving the preliminary design. For demonstration purposes, the framework was used to design and evaluate two case studies located in Blacksburg (VA) and Minneapolis (MN). These loca

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Westman, Peter, and Mikael Andersson. "Design of behavior classifying and tracking system with sonar." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11495.

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<p>The domain below the surface in maritime security is hard to monitor with conventional methods, due to the often very noisy environment. In conventional methods the measurements are thresholded in order to distinguish potential targets. This is not always a feasible way of treating measurements. In this thesis a system based on raw measurements, that are not thresholded, is presented in order to track and classify divers with an active sonar. With this system it is possible to detect and track weak targets, even with a signal to noise ratio that often goes below 0 dB.</p><p>The system in th

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Flores, Garcia Erick. "Simulation of attitude and orbital disturbances acting on ASPECT satellite in the vicinity of the binary asteroid Didymos." Thesis, Luleå tekniska universitet, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62007.

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Asteroid missions are gaining interest from the scientific community and many new missions are planned. The Didymos binary asteroid is a Near-Earth Object and the target of the Asteroid Impact and Deflection Assessment (AIDA). This joint mission, developed by NASA and ESA, brings the possibility to build one of the first CubeSats for deep space missions: the ASPECT satellite. Navigation systems of a deep space satellite di er greatly from the common planetary missions. Orbital environment close to an asteroid requires a case-by-case analysis. In order to develop the Attitude Determination Cont

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Reynell, M. J. W. "An investigation into the sensitivity of the performance of an active solar heating system to the control strategy employed." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353765.

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The aim of this thesis was to investigate and challenge current thinking regarding the sensitivity of the thermal performance of active solar water heating systems to the control strategy employed, with particular attention to the effect of the control temperature differential settings between the solar absorber plate and the solar store at which the circulating pump is switched on and off (dTon and dToff). A mathematical analysis suggested that the performance should be more sensitive to the above parameters than is generally believed. The theoretical appraisal also suggested a relationship f

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Ghosh, Shibani. "A Real-time Management of Distribution Voltage Fluctuations due to High Solar Photovoltaic (PV) Penetrations." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/74424.

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Due to the rapid growth of grid-tied solar photovoltaic (PV) systems in the generation mix, the distribution grid will face complex operational challenges. High PV penetration can create overvoltages and voltage fluctuations in the network, which are major concerns for the grid operator. Traditional voltage control devices like switched capacitor banks or line voltage regulators can alleviate slow-moving fluctuations, but these devices need to operate more frequently than usual when PV generation fluctuates due to fast cloud movements. Such frequent operations will impact the life expectancy o

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Raffaelli, Tatiana Ferreira. "Previsão de atividade solar a partir da configuração dos campos magnéticos fotosféricos." Universidade Presbiteriana Mackenzie, 2007. http://tede.mackenzie.br/jspui/handle/tede/1480.

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Made available in DSpace on 2016-03-15T19:38:06Z (GMT). No. of bitstreams: 1 Tatiana Ferreira Raffaelli.pdf: 1372071 bytes, checksum: 274f2a97f290810c43d6e7c6e0730d1a (MD5) Previous issue date: 2007-09-18<br>The existence of a highly reliable prediction system to detect the occurrence of large solar flares (class X) is still an unsolved problem. Despite many studies performed so far, no such a system has been found yet. In this work, we have developed a method using Bayesian Network - an Artificial Intelligence technique for the detection of giant solar flares. The Bayesian Networks softw

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Coste, Marianne. "Les processus sédimentaires, depuis la pente continentale jusqu'au bassin, en contexte de tectonique active : analyse comparée entre la Marge Calabro-Ionienne et la Marge Ligure durant les derniers 5 Ma." Phd thesis, Université Nice Sophia Antipolis, 2014. http://tel.archives-ouvertes.fr/tel-01062293.

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Les marges continentales, passives ou actives, sont la principale voie de transfert sédimentaire entre le plateau continental et le bassin océanique profond et les plaines abyssales. Les pentes continentales sont le siège de processus d'érosion/dépôt sous le contrôle de transfert de flux particulaires continentaux chenalisés par des structures érosives, telles que les canyons sous‐marins, puis redistribues à l'ensemble de la marge. Les canyons érodent fortement les pentes continentales et contribuent à l'évolution de leur morphologie au cours du temps. On retrouve cependant des canyons sous‐ma

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Moghadasiriseh, Amirhasan. "Analysis and Modeling of Advanced Power Control and Protection Requirements for Integrating Renewable Energy Sources in Smart Grid." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2469.

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Attempts to reduce greenhouse gas emissions are promising with the recent dramatic increase of installed renewable energy sources (RES) capacity. Integration of large intermittent renewable resources affects smart grid systems in several significant ways, such as transient and voltage stability, existing protection scheme, and power leveling and energy balancing. To protect the grid from threats related to these issues, utilities impose rigorous technical requirements, more importantly, focusing on fault ride through requirements and active/reactive power responses following disturbances. This

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Kubátová, Anna. "Heating of building with almost zero energy consumption." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225687.

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The aim of the thesis is to model energetic needs for heating and temperatures progress in the building with almost zero energy consumption. The part of the work is the economical and energetic comparison. Proposed systems are based on a knowledge of active houses.

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Ala-Mutka, Jonatan. "Powering Africa by Empowering its People : An Action Research study at a Zambian microgrid company building local capacity to reach large scale viability." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-261596.

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Despite recent advances in the global electrification rates, increasing from 76% in 1990 to 85% in 2012, the United Nations goal of universal access to electricity by 2030 is still far from achieved, with an estimated 1.1 billion people still without access to electricity. Over half of these live in Sub-Saharan Africa, with a majority in rural areas and extreme poverty. Major challenges are inert with the current electrification path of centralized grid extension, leaving these people without power in decades to come. Microgrids, a decentralized power system consisting of solar power generatio

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El-Jaber, MOHAMMAD. "Target Tracking in Multi-Static Active Sonar Systems Using Dynamic Programming and Hough Transform." Thesis, 2009. http://hdl.handle.net/1974/2590.

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Tracking multiple targets in a high cluttered environment where multiple receivers are used is a challenging task due to the high level of false alarms and uncertainty in the track hypothesis. The multi-static active sonar scenario is an example for such systems where multiple source-receiver combinations are deployed. Due to the nature of the underwater environment and sound propagation characteristics, tracking targets in the underwater environment becomes a complex operation. Conventional tracking approaches (such as the Kalman and particle filter) require a predetermined kinematic model of

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Tseng, Wei-Yuan, and 曾緯元. "Developing Active Sonar System to Detect Target in Harbor Environment." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4ps55b.

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碩士<br>國立中山大學<br>海下科技研究所<br>106<br>Harbor defense has always been a topic of great concern to many countries and the direction of development. In this paper, an underwater listening array system will be integrated to detect underwater targets in Kaohsiung Harbor. Include： 1. Hardware integration (analog to digital recorder, 4 underwater microphones, power supply wiring) 2. Signal design (linear frequency modulation signal) 3. Power supply configuration (lithium battery *4) 4. Signal processing technology In order to correctness of array system, the measurement experiment in May and June 2017, a

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Chung-Chuan, Huang, and 黃崇鵑. "The Active Tracking Control System Design Of Solar Collector." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/57675547834584586948.

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碩士<br>中華科技大學<br>電子工程研究所碩士班<br>98<br>In this paper, solar tracking device to control the sun azimuth and elevation control formula and use Matlab/Simulink simulation software to control the directionality of solar panels. Body in a simulated experiment to track the sun position of celestial bodies accuracy and controller design, as the direction of the study. The solar tracker to accurately track the sun, running, generally divided into two kinds of active and passive: passive relying on optical sensor (light-sensitive resistor) is used for sensing the location of the sun the moment, such a

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LI, CHIA-HUNG, and 李家宏. "Development of Active Solar Tracking System and Electric Energy Conversion System with MPPT." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/725rx3.

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碩士<br>聖約翰科技大學<br>電機工程系碩士班<br>106<br>This paper is to develop a real-time sun tracking system with MPPT to improve the electrical efficiency of PV. In the system, the time driven biaxial tracking system is made with PIC16F883 single-chip. The main purpose of the time driven biaxial tracking system is to increase the electrical efficiency of the traditional fixed PV. The core reason why PIC single chip is used as the time driven biaxial tracking system is that the position and angle of the solar light can be calculated quickly and accurately. It is for the purpose of PV can get gabundant sunshin

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Lockard, David Alexander. "The performance of residential active collect/passive store solar space-heating systems." 1987. http://catalog.hathitrust.org/api/volumes/oclc/15716979.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1987.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 165-166).

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19

Tsai, Tung-Yu, and 蔡東育. "A Study on Active Islanding Detection Technologies in Solar Photovoltaic System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/77813710000139374937.

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碩士<br>中原大學<br>電機工程研究所<br>95<br>In a grid-connected solar photovoltaic (PV) system, as grid is disconnected from the solar PV system, if the disconnection is not detected and the PV system operated independently, it is called “islanding operation”. The detection methods can be categorized into passive and active approaches. The passive detection approaches suffer from the existence of un-detection zone (UDZ). Also, exist the issues of active approaches with high cost, power losses, and un-detection zone in the detection process. Therefore, to improve the UDZ drawbacks of the existing active Sli

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20

Wang, Hong-Zhou, and 王宏州. "Development of Daylight Catching System for Illumination by Active Solar Tracking." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/6p9746.

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碩士<br>國立臺北科技大學<br>冷凍空調工程系所<br>100<br>With the increasing awareness of sustainable and green building, more and more people are concerned with the efficiency of energy use at home and at work. A solar tracking skylight illumination system, which enables us to conserve energy by producing increased interior light levels for a longer duration than normally possible, can fit to the above need and have widen been used in the indoor illumination gradually. Tracking sunlight and guide the light indoor as a source of illumination is also a way of energy saving. Daylight catching system, simply put, th

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YANG, CHI-WEN, and 楊啓文. "Active Push Pull Solar Tracking System Hardware and Software Design and Realization." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/17319172052841560868.

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碩士<br>中華科技大學<br>電子工程研究所碩士班<br>99<br>Abstract This article is to design, through NI LabVIEW software, the controlling dual-axis solar tracking platform, to enable the platform to automatically track the sun so as to obtain the utmost sunlight energy. Based on the earth orbiting from the sun formula, it will automatically calculate the sun rays to the local horizontal elevation and azimuth information, feed into the tracking platform for control systems, and command the control systems to present the required elevation and azimuth patterns. In the research project, we will design a dual-axis to

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Allard, Amélie. "A Linear Data-Driven System Identification Methodology for an Active/Passive Solar Thermal Storage System and Application to a Solar House." Thesis, 2013. http://spectrum.library.concordia.ca/977501/1/Allard_MASc_F2013.pdf.

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This thesis presents a methodology developed to identify a parametric model of a thermally-activated building system (TABS) using a system identification (SI) tool. The model was identified with collected data from an energy efficient solar single-family residential building, the Ecoterra™ house located in Eastman, Quebec. The TABS is a ventilated concrete slab (VCS) serving as an energy storage medium for active and passive solar gains in the basement. The system uses the structural mass of the house to store active solar gains collected by the building-integrated photovoltaic/thermal (BIPV/T

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Chang, Chia-Yuan, and 張佳源. "Design and Implementation of Grid-Connected Solar PV System with Active Power Filter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/53905350171060053228.

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碩士<br>中原大學<br>電機工程研究所<br>96<br>The objective of this thesis is to develop a grid-connected solar photovoltaic (PV) system with active power filter. For solar cells, the system adopts the dc/dc boost power converter as well as the improved incremental conductance algorithm for to accelerate the maximum power point speed and the chattering phenomena around maximum power points are reduced and reducing power losses. In addition, the bi-directional dc/dc power converter is designed to charge or discharge batteries in order to regulate the power flow between solar cells, grid power and loads so tha

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Lee, Chien-Ho, and 李建和. "Active Building Envelope System(ABE)：Wind & Solar driven Ventilation、Electricity、Heat Pump." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/17268284287304534139.

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碩士<br>中華大學<br>機械工程學系碩士班<br>97<br>This study takes the ventilation into consideration, making the ABE system more tally with the realistic conditions. The new mechanism of heat transfer was proposed. Then the analytic model has to be revised. Analytic solution will be resulted and verified by the numerical solution of CFD. Finally, we found out that no matter when the fan streamline’s distributed, or the PMV, mean age of air will superior than the fan which has not opened when the fan is turned on, and only the temperature distributed is opposite. In addition, the comparative results of numeri

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Liu, Wan-Chi, and 劉琬琪. "ACTIVE SOLAR PANEL DUAL-AXIS SUN TRACKING SYSTEM WITH MAXIMUM POWER POINT TRACKING FUZZY CONTROLLER DESIGN." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/82540205600391715207.

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碩士<br>大同大學<br>電機工程學系(所)<br>97<br>The purpose of this thesis is to design an active solar panel dual-axis suntracking system with maximum power point tracking fuzzy controller. The tracking system tracks the maximum solar power point no matter what the environmental condition it is and orients the solar panel toward the Sun to enhance the efficiency of thephotovoltaic generation system. First, the operating points of the PV panel are adjusted by a boost converter. The PV voltage and current are measured in real time, and used to estimate the system parameters in the power-voltage polynomial equ

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YANG, CHAO-KAI, and 楊詔剴. "A Study on the Differences between the Altitude-Azimuth Type and Polar-Axis Type Active Sun-Tracking Systems for Solar Thermal Power Application." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/97zj9b.

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博士<br>國立高雄應用科技大學<br>機械工程系<br>106<br>In this article, a unique concentrated solar tracking system, the electromechanical and open-looped altitude-azimuth biaxial-type without additional power, was developed for solar-thermal applications. This system adopted the Fresnel lens module to concentrate sunlight on a Stirling engine’s heating head while conducting measurements for the temperature profile of the heating head. We also installed solar panels on both sides of the solar tracking system to supply power to the driving motors and reduce the torque needed for mechanism operation. In order to o

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YOSHIOKA, MASAYO, and 吉岡正代. "A Study of Factors That Influence Elementary and Junior High School Principals to Adopt Solar Power Systems –From Theory of Reasoned Action and Motivation Theory Perspectives." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/g9xmzs.

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碩士<br>國立高雄師範大學<br>事業經營學系<br>106<br>ABSTRACT This study investigated the determining factors for the adoption of solar power systems by the principals of the elementary and high schools based on Theory of reasoned action and Motivation theory. The principals of the elementary and junior high schools in Gaoping District were selected as the research objects in this study, and a total of 158 valid questionnaires were collected. The statistical analysis was performed using SPSS and SmartPLS software. The results showed that the attitude of the elementary and junior high school principals toward t

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Lima, Pedro Miguel Ribeiro de. "Validação de um filtro ativo paralelo monofásico com interface de energias renováveis e sistemas de armazenamento de energia." Master's thesis, 2018. http://hdl.handle.net/1822/61860.

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Dissertação mestrado em Engenharia Eletrónica Industrial e Computadores<br>Atualmente, a utilização de cargas não lineares na indústria e nos consumidores gerais é cada vez mais frequente. Este tipo de cargas contribui para acentuar problemas de qualidade de energia elétrica (QEE), resultando em várias consequências, como falhas em equipamentos eletrónicos e subsequente perda de eficiência e envelhecimento prematuro desses dispositivos, podendo causar perdas e prejuízos elevados. Dos problemas de QEE, destacam-se: distorção harmónica nas tensões e/ou correntes, ruído eletromagnético, inter-har

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