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Dissertations / Theses on the topic 'Anti-submarine warfare'

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Published: 4 June 2021

Last updated: 28 July 2024

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1

Timmerman, Michael Jay. "A genetic algorithm based anti-submarine warfare simulator." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA274956.

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2

Lee, Theresa, Thomas Murphy, Matthew Menza, Thelmar Rosarda, and Sean Rath. "Littoral combat ship open ocean anti-submarine warfare." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/42719.

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Approved for public release; distribution is unlimited<br>This capstone explored the littoral combat ship (LCS) and its potential to fulfill the anti-submarine warfare (ASW) mission for open ocean escort of high value assets. A systems engineering approach was used to develop requirements and implement modeling and simulation through a clearly defined prime directive and concept of operations, measures of effectiveness, and measures of performance. The effort was concentrated on the detection, identification and tracking variables of the ASW mission kill chain with an emphasis on active sonar. Data was entered into a Zwicky morphological box and a Pugh matrix to assess candidate solutions in an analysis of alternatives. To address Department of Defense fiscal constraints, the LCS will allow coverage for a wider spectrum of anti-submarine threats in a theoretically less costly platform than traditional nuclear submarines. The ability for the U.S. Navy to maintain its open ocean dominance now and into the foreseeable future will depend on new and innovative threat capability designs. The modular concept of the LCS platform and its agile performance make it a candidate to satisfy a lower cost ASW mission platform while addressing the changing complexity of threat detection, identification and tracking of enemy subsurface threats. Network fusion and connectivity, integrated sensor capabilities and an eccentric mix of subsurface and aerial surveillance may be combined to meet the requirements for a reliable ASW platform. The LCS could provide ASW escort capability to allow high value units or non-combatants the ability to safely transit the open ocean.

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3

Broadmeadow, James, Francis Dziekan, Francis Frantz, et al. "Improved Anti-Submarine Warfare (ASW) effectiveness MSSE Capstone Project." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/6934.

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The protection of our nation's ability to operate military forces freely and safely across the world's oceans remains a paramount goal of the United States Navy. The NUWC Division Newport cohort applied the disciplined practice of systems engineering processes to analyze and improve upon Anti-Submarine Warfare effectiveness in support of Carrier Strike Group operations. The cohort sought customer feedback to understand and formalize the perceived needs and formulate and rank candidate solutions to meet these needs. The systems engineering team, seeking solutions that provide improved Carrier Strike Group defense from undersea threats, generated 14 alternative architectures for analysis. The alternatives that passed feasibility screening underwent performance and cost modeling, reliability screening, and risk analysis to help provide a basis for comparison. The analysis demonstrated that a distributed barrier of active sensors placed and maintained by a Littoral Combat Ship provided an effective detection and engagement solution. The team further concluded that coupling the barrier with development of advanced capability improvements to the platform-based active sonar provided an effective layered defense approach. This rigorous process demonstrated the value of the systems engineering process and identified key areas for continued investigation to support continued United States Navy dominance of the undersea domain.

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4

Thomas, Adam J. "Tri-level optimization for anti-submarine warfare mission planning." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FThomas.pdf.

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Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 2008.<br>Thesis Advisor(s): Brown, Gerald G. ; Wood, R. Kevin. "September 2008." Description based on title screen as viewed on November 5, 2008. Includes bibliographical references (p. 53-54). Also available in print.

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5

Mancini, Steven. "Sensitivity of satellite altimetry data assimilation on a Naval Anti-Submarine Warfare Weapon System." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sep%5FMancini.pdf.

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6

Mann, Joelle J. "ASW fusion on a PC." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FMann.pdf.

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Thesis (M.S. in Applied Science (Operations Research))--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Alan Washburn. Includes bibliographical references (p. 49-50). Also available online.

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7

Agpaoa, Roy, Matthew Cawley, Chad Cossey, et al. "Hybrid Airship Multi-Role (HAMR) Anti-Submarine Warfare (ASW) mission capability." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/6935.

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The Hybrid Airship Multi-Role (HAMR) Anti-Submarine Warfare (ASW) Mission Module project applies established systems engineering principles and processes to the design of an ASW payload module that examines the capability of the HAMR to perform persistent ASW mission support. Critical system functions and objectives are identified and are assigned appropriate quantitative metrics. Additionally, three alternative architectures are generated and evaluated using the appropriate metrics based on results from modeling using Naval Systems Simulation (NSS). Manning is considered as a key stakeholder parameter and is included as an evaluation concern. The alternatives are also compared through the examination of life cycle costs. The recommendation to the stakeholders based on the research and results is an unmanned ASW sensor platform that uses other ASW assets for prosecution.

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8

Biediger, Jeremy S. "Environmental acoustic considerations for passive detection of maritime targets by hydrophones in a deep ocean trench." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Jun/10Jun%5FBiediger.pdf.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2010.<br>Thesis Advisor(s): Rice, Joseph A. "June 2010." Description based on title screen as viewed on July 14, 2010. Author(s) subject terms: underwater acoustics, Seaweb, Deep Seaweb, undersea noise calculation, ocean trenches, surveillance, anti-submarine warfare, maritime domain awareness, passive detection, reliable acoustic path, sensor network Includes bibliographical references (p. 47-48). Also available in print.

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9

Feustel, Richard D. "A joint campaign analysis approach to antisubmarine warfare using a circulation model template." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA322913.

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Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1996.<br>Thesis advisor(s): Wayne P. Hughes. "September 1996." Includes bibliographical references (p. 115). Also available online.

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10

Scherer, Scott D. "Game-Theoretic Anti-Submarine Warfare Mission Planner (heuristic-based, fully Excel capable)." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FScherer.pdf.

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Thesis (M.S. in Operations Research)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Brown, Gerald G. "September 2009." Description based on title screen as viewed on November 5, 2009. Author(s) subject terms: Optimization, Mathematical Programming, Heuristic Algorithms, Network Flows, Anti-Submarine Warfare, Search and Detection, Game Theory. Includes bibliographical references (p. 53). Also available in print.

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11

Llewellyn-Jones, Malcolm. "The Royal Navy on the threshold of modern anti-submarine warfare, 1944-1949." Thesis, King's College London (University of London), 2004. https://kclpure.kcl.ac.uk/portal/en/theses/the-royal-navy-on-the-threshold-of-modern-antisubmarine-warfare-19441949(dc9eb40f-0420-40c3-a6f8-c800fcdc96d4).html.

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12

Krout, David Wayne. "Intelligent ping sequencing for multiple target tracking in distributed sensor fields /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6045.

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13

Heidt, Sarah L. "Long-range atmosphere-ocean forecasting in support of undersea warfare operations in the western north Pacific." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FHeidt.pdf.

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Thesis (M.S. in Physical Oceanography and M.S. in Meteorology)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Murphree, Tom ; Stone, Rebecca E. "September 2009." Description based on title screen as viewed on November 10, 2009. Author(s) subject terms: Sonic Layer Depth, Undersea Warfare, USW, Military Operations, Planning Timeframe, Anti-Submarine Warfare, ASW Western North Pacific, Climate, Climatology, Climate Analysis, Climate Prediction, Smart Climatology, Conditional Climatology, Long-range Forecast, Statistical Forecast, Simple Ocean Data Assimilation, SODA, Meteorology, Oceanography Includes bibliographical references (p. 71-73). Also available in print.

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14

Son, Byungsoo. "Track spacing for an Archimedes spiral search by a maritime patrol aircraft (MPA) in Anti-Submarine Warfare (ASW) operations." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FSon.pdf.

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Thesis (M.S. in Operations Research)--Naval Postgraduate School, December 2007.<br>Thesis Advisor(s): Eagle, James. "December 2007." Description based on title screen as viewed on January 18, 2008. Includes bibliographical references (p. 31). Also available in print.

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15

Akbori, Fahrettin. "Autonomous-agent based simulation of anit-submarine warfare operations with the goal of protecting a high value unit /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FAkbori.pdf.

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Thesis (M.S. in Modeling, Virtual Environments and Simulation (MOVES))--Naval Postgraduate School, March 2004.<br>Thesis advisor(s): Christian Darken, Curtis Blais. Includes bibliographical references (p. 103-104). Also available online.

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16

Vaughan, Evan Michael. "The Development of Anti-submarine Warfare in the Mediterranean: the American Contribution and the Bombardment of Durazzo." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc115176/.

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The Entente powers began World War I without any formal anti-submarine countermeasures. However, the Entente developed countermeasures through trial and error over time. Success was moderate until America joined the war. with America came the arrival of subchasers to the Mediterranean Theater of Operations. This highly specialized vessel helped turn the tide against U-boats. a true counter to the U-boat threat in the Mediterranean did not come until October 2, 1918 with the bombardment of Durazzo. This thesis discusses the development of Entente anti-submarine capabilities and illustrate how America's contribution led to success. a detailed analysis of the rarely discussed bombardment of Durazzo is included using archival documents.

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17

Akbori, Fahrettin. "Autonomous-agent based simulation of anti-submarine warfare operations with the goal of protecting a high value unit." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1718.

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Approved for public release, distribution unlimited<br>The Anti-Submarine Warfare screen design simulation is a program that provides a model for operations in anti-submarine warfare (ASW). The purpose of the program is to aid ASW commanders, allowing them to configure an ASW screen, including the sonar policy, convoy speed, and the number of ships, to gain insight into how these and other factors beyond their control, such as water conditions, impact ASW effectiveness. It is also designed to be used as a training tool for ASW officers. The program is implemented in Java programming language, using the Multi Agent System (MAS) technique. The simulation interface is a Horizontal Display Center (HDC) which is very similar to a MEKO200 class Frigate Combat Information Center's (CIC) HDC. The program uses Extensible Markup Language (XML) files for reading data for program scenarios; parameters are initialized before each run time begins. The simulation also provides all the output data at the end of run time for analysis purposes. The program user's goal, and the purpose of the program, is to decrease the number of successful attacks against surface vessels by changing the configuration parameters of the ASW screen, to reflect sonar policy, convoy speed or number of ships in the simulation. Ongoing use of the program can provide data needed to anticipate required operational needs in future ASW situations.<br>Lieutenant Junior Grade, Turkish Navy

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18

Ruffilli, Dean C. "Operational research and the Royal Canadian Air Force Eastern Air Command's search for efficiency in airborne anti-submarine warfare, 1942-1945." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65204.pdf.

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19

Unlu, Salim. "Effectiveness of unmanned surface vehicles in anti-submarine warfare with the goal of protecting a high value unit." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45955.

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Approved for public release; distribution is unlimited<br>Littoral anti-subMarine warfare (ASW) operations generally focus on deterring and eliminating enemy diesel-electric subMarines from transit routes and protecting High Value Units (HVUs), such as amphibious warfare ships and logistics ships. In view of the ASW challenges in the littorals, it is critical to establish and maintain a highly effective ASW capability. The ASW techniques that we use today are mostly effective, but it is important to explore new technologies and techniques—such as potential unmanned surface vehicle (USV) solutions. This study uses an agent-based simulation platform known as Map Aware Non-Uniform Automata (MANA) to model the ASW effectiveness of USVs with the goal of protecting a HVU. The effectiveness of an ASW screen formation is measured by the proportion of successful classifications. The results are analyzed using comparison methods, stepwise linear regression, and regression trees. It is found from nearly 390,000 simulated ASW missions that when helicopters are replaced with USVs, which have the same sensor type and capability, they can provide the same classification effectiveness in an ASW screen formation. The analysis also shows that the most significant characteristic of USVs is the classification range of their dipping sonar.

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20

Baggett, John P. "Logistical analysis of the Littoral Combat Ship (LCS) operating independently in the Pacific." Thesis, Monterey, CA : Naval Postgraduate School, 2008. http://handle.dtic.mil/100.2/ADA479828.

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21

Lentz, Frederick Charles. "Integration of ASW helicopter operations and environment into NPSNET." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA304302.

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Thesis (M.S. in Computer Science) Naval Postgraduate School, September 1995.<br>"September 1995." Thesis advisor(s): Michael J. Zyda, John S. Falby. Includes bibliographical references (p. 107). Also available online.

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22

Wilson, Anthony M. "The impact of software reuse on the cost of Navy sonar and fire control systems." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Jun/09Jun%5FWilson_A.pdf.

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Thesis (Master of Business Administration)--Naval Postgraduate School, June 2009.<br>Thesis Advisor(s): San Miguel, Joseph G. "June 2009." Description based on title screen as viewed on July 14, 2009. Author(s) subject terms: software reuse, reuse, ASW software, sonar, fire control, APB, ARCI. Includes bibliographical references (p. 97-100). Also available in print.

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McDowell, Pamela. "Environmental and Statistical Performance Mapping Model for Underwater Acoustic Detection Systems." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1157.

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This manuscript describes a methodology to combine environmental models, acoustic signal predictions, statistical detection models and operations research to form a framework for calculating and communicating performance. This methodology has been applied to undersea target detection systems and has come to be known as Performance Surface modeling. The term Performance Surface refers to a geo-spatial representation of the predicted performance of one or more sensors constrained by all-source forecasts for a geophysical area of operations. Recent improvements in ocean, atmospheric and underwater acoustic models, along with advances in parallel computing provide an opportunity to forecast the effects of a complex and dynamic acoustic environment on undersea target detection system performance. This manuscript describes a new process that calculates performance in a straight-forward "sonar-equation" manner utilizing spatially complex and temporally dynamic environmental models. This performance model is constructed by joining environmental acoustic signal predictions with a detection model to form a probabilistic prediction which is then combined with probabilities of target location to produce conditional, joint and marginal probabilities. These joint and marginal probabilities become the scalar estimates of system performance. This manuscript contains two invited articles recently accepted for publication. The first article describes the Performance Surface model development with sections on current applications and future extensions to a more stochastic model. The second article is written from the operational perspective of a Naval commanding officer with co-authors from the active force. Performance Surface tools have been demonstrated at the Naval Oceanographic Office (NAVOCEANO) and the Naval Oceanographic Anti-Submarine Warfare (ASW) Center (NOAC) in support of recent naval exercises. The model also has recently been a major representation for the "performance" layer of the Naval Meteorological and Oceanographic Command (NAVMETOCCOM) in its Battlespace on Demand strategy for supporting the Fleet with oceanographic products.

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24

Amezaga, Guillermo R. "Impact of GFO satellite and ocean nowcast/forecast systems on Naval antisubmarine warfare (ASW)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FAmezaga.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, March 2006.<br>Thesis Advisor(s): Peter C. Chu. Includes bibliographical references (p. 131-132). Also available online.

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25

Schulte, Walter B. "The frequency response, impulse response, and transfer function of an ocean waveguide /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FSchulte.pdf.

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Thesis (M.S. in Applied Science (Signal Processing))--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Lawrence J. Ziomek. Includes bibliographical references (p. 47). Also available online.

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26

Waldmann, Júnior Ludolf. "Tecnologia naval e política: o caso da marinha brasileira na era dos contratorpedeiros, 1942-1970." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/1017.

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Made available in DSpace on 2016-06-02T19:14:59Z (GMT). No. of bitstreams: 1 5410.pdf: 2286811 bytes, checksum: 5992c36bb680140d19c9b5e348cfea97 (MD5) Previous issue date: 2013-03-20<br>Financiadora de Estudos e Projetos<br>This work aims to analyze the technological modernization of the Brazilian Navy in the period between 1942 and 1970. Despite starting the Second World War without conditions of defending the country, the Brazilian Navy has modernized with American support, equipping it with modern anti-submarine equipment within the concept of hemispheric defense. At the end of the conflict and start of the Cold War, U.S. politics for the Latin America changed, and the Brazilian Navy stopped receiving modern military equipment from that country. Nevertheless, most Brazilian officers continued supporting the principles of the hemispheric defense, which mean subordination, strategic and intellectual, to the U.S. Navy. For much of the following decades, despite the changes in the foreign policy and investments in scientific and technological research in Brazil, the Brazilian Navy continued subordinated to the concept of hemispheric defense, with an obsolete fleet and unable to get modern ships. In late 1960s, the Brazilian Navy begins to face difficulties in acquiring modern weapons because of changes in the U.S. politics, culminating in the acquisition of British frigates, which despite having great emphasis on anti-submarine warfare, mark the recovery of shipbuilding in Brazil, the beginning of the withdrawal of the material and intellectual dependence on the U.S. and a major technological leap in the Brazilian Navy.<br>Este trabalho tem como objetivo analisar a modernização tecnológica da Marinha Brasileira no período entre 1942 e 1970. Apesar de iniciar a Segunda Guerra Mundial sem condições de defender o país, a Marinha se modernizou, com recursos norteamericanos, equipando-se com moderno equipamento antissubmarino, dentro da concepção de defesa hemisférica. Ao final do conflito e início da Guerra Fria, a política dos EUA para a América Latina mudou, e a Marinha parou de receber equipamentos militares modernos daquele país. Apesar disso, a maioria dos oficiais continuou apoiando os princípios de defesa hemisférica, o que significava a subordinação, estratégica e intelectual, à marinha norte-americana. Durante grande parte das décadas seguintes, a despeito das mudanças na política externa e investimentos na pesquisa científica e tecnológica no Brasil, a Marinha continuou subordinada à concepção de defesa hemisférica, com uma frota obsoleta e sem conseguir navios modernos. Já no final dos anos de 1960, a Marinha começa a enfrentar dificuldades na aquisição de armamentos por mudanças na política norte-americana, que culminam na aquisição de fragatas britânicas, que apesar de ainda terem grande ênfase na guerra antissubmarino, marcam a retomada da construção naval no país, o início do afastamento da dependência material e intelectual dos EUA e num importante salto tecnológico na Marinha.

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27

Gameiro, Gonçalo. "Design modifications of a UAV wing for optimal integration of a magnetic anomaly detection sensor." Master's thesis, Academia da Força Aérea; Instituto Superior Técnico, 2018. http://hdl.handle.net/10400.26/40254.

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Supervisors: Prof. Afzal Suleman. Examination Committee: Chairperson: Prof. Filipe Szolnoky Ramos Pinto Cunha; Supervisor: Prof. Afzal Suleman; Member of the Committee: Major Dr. Luís Filipe da Silva Félix<br>This work describes the conceptual design of a Unmanned Air Vehicle (UAV) wing with a Magnetic Anomaly Detection (MAD) sensor for submarine detection operations. Nowadays, underwater marine vessels are able to evade conventional detection methods such as sonar. Therefore, it is necessary to integrate MAD sensors in modern Anti-Submarine Warfare theatres. UAVs typically generate a magnetic field due to the electrical systems on board, causing interference noise on the MAD sensor data analysis and compromising its performance. To address these issues, a characterization of the aircraft’s magnetic signature was conducted, and it was found that the wing tip and a tail stinger boom are the best options to minimize the magnetic noise. A structural and aerodynamic analysis of the aircraft showed the wing tip configuration was the best option since the amount of mass required to counter the moment of a tail stinger boom would require major modifications on the UAV. Also, the aircraft magnetic signature is minimum at the wing tip, with an intensity of -2.9nT. An aerodynamic characterization of the aircraft was carried to evaluate the effect of the MAD pods on the wingtips. A parametric optimization of the wing was conducted. Given the dimensional constraints on the wing structure and a target magnetic noise of 2nT at the wing tip, the optimizer objective function was to minimize the total fuel consumption. The optimum solution allowed a decrease of 30% on the magnetic noise and a fuel consumption of 8.71 kg of fuel for an 8-hour search operation.<br>Este trabalho descreve o processo de projeto conceptual de uma asa de um Veículo Aéreo Não-Tripulado (VANT) com um sensor de anomalias magnéticas (AM) para ser usado em deteção de submarinos. Atualmente, estes veículos estão dotados com capacidades que diminuem as hipóteses de detecão por métodos convencionais, como o sonar. Assim, torna-se necessário integrar sensores de AM em cenários atuais de Guerra Anti-Submarina. Os sistemas aviónicos destas aeronaves geram um campo magnético que causa interferência no sensor de AM, causando ruído nos dados da análise e comprometendo a sua eficiência. Para evitar este problema, realizou-se uma caracterização da assinatura magnética da aeronave, concluindo que as pontas das asas e uma configuração de arpão na cauda seriam as melhores soluções para colocar o sensor, a fim de minimizar a interferência magnética. Estudos estruturais e aerodinâmicos revelaram que a primeira seria a melhor opção, pois a massa necessária para anular o momento gerado na segunda requeria alterações substanciais na estrutura da aeronave. A ponta da asa era também o local com menor nível de assinatura magnética. Realizou-se uma otimização paramétrica da asa da aeronave, considerando os efeitos aerodinâmicos dos invólucros do sensor. Atendendo às restrições no dimensionamento da estrutura da asa e a um valor de interferência magnética, o otimizador teria como objetivo minimizar o consumo total de combustível. A solução ótima permitiu reduzir em 30% o valor da assinatura magnética na ponta da asa e obter uma configuração que, numa missão de patrulha de 8 horas, consome 8.71 kg de combustível.<br>N/A

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Schulte, Walter B. III. "The frequency response, impulse response, and transfer function of an ocean waveguide." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1516.

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Approved for public release, distribution is unlimited<br>In this thesis, the ocean was modeled as a waveguide with an ideal pressure - release surface, and an ideal rigid bottom. The ocean waveguide was then treated as a linear, time - invariant, space - variant (TISV) filter or communication channel. The filter is time - invariant because no motion was modeled and because the properties of the ocean were assumed to be constant. The filter is space - variant because of the presence of the two boundaries, that is, the ocean surface and ocean bottom. This thesis investigates the ocean as a linear TISV filter by evaluating 1) the complex frequency response, 2) the impulse response, and 3) the transfer function of the ocean with respect to depth. It is shown that the TISV impulse response of the ocean contains information that can be used to help localize a target in range and whether the target is above or below the receiver. Computer simulation results were obtained by evaluating the three filter functions for several different test cases.<br>Ensign, United States Navy

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29

Hansen, Cody Robert Daniel. "Magnetic signature characterization of a fixed-wing vertical take-off and landing (VTOL) unmanned aerial vehicle (UAV)." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10413.

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The use of magnetometers combined with unmanned aerial vehicles (UAVs) is an emerging market for commercial and military applications. This study presents the methodology used to magnetically characterize a novel fixed-wing vertical take-off and landing (VTOL) UAV. The most challenging aspect of integrating magnetometers on manned or unmanned aircraft is minimizing the amount of magnetic noise generated by the aircraft’s onboard components. As magnetometer technology has improved in recent years magnetometer payloads have decreased in size. As a result, there has been an increase in opportunities to employ small to medium UAV with magnetometer applications. However, in comparison to manned aviation, small UAVs have smaller distance scales between sources of interference and sensors. Therefore, more robust magnetic characterization techniques are required specifically for UAVs. This characterization determined the most suitable position for the magnetometer payload by evaluating the aircraft’s static-field magnetic signature. For each aircraft component, the permanent and induced magnetic dipole moment characteristics were determined experimentally. These dipole characteristics were used to build three dimensional magnetic models of the aircraft. By assembling the dipoles in 3D space, analytical and numerical static-field solutions were obtained using MATLAB computational and COMSOL finite element analysis frameworks. Finally, Tolles and Lawson aeromagnetic compensation coefficients were computed and compared to evaluate the maneuver noise for various payload locations. The magnetic models were used to study the sensitivity of the aircraft configuration and to simultaneously predict the effects at potential sensor locations. The study concluded by predicting that a wingtip location was the area of lowest magnetic interference.<br>Graduate

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