Дисертації з теми "Digital beamforming array"
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Marsh, David Moyle. "Phased Array Digital Beamforming Algorithms and Applications." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7499.
Повний текст джерелаSullivan, Arthur, Christos Christodoulou, and Charles W. Chandler. "NEXT GENERATION DIGITAL BEAMFORMING ARRAY OPTIMIZED BY NEURAL NETWORK BEAMFORMING TECHNIQUES." International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607379.
Повний текст джерелаThe next generation Digital Beamforming Array (DBFA) requires techniques beyond the existing adaptive processing and optimization approaches. By utilizing neural network processing and genetic algorithms that mimic complicated natural processes, such as the brain and natural selection, new and superior Antenna Arrays can be designed. The use of Neural Networks and Genetic Algorithms combined with the existing techniques for DBFAs can yield the ultimate in “real-time,” “smart” antenna performance. Cost is significantly reduced by; allowing large manufacturing tolerances, the use of inexpensive components, and correcting by neural network techniques. This paper describes the technology and proposes a practical application of the technique to design a DBFA to track and transmit/receive telemetry from a shipboard vertically launched medium range missile.
Wilson, Mark Joseph. "An investigation into sparse array design in digital sonar beamforming." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/112.
Повний текст джерелаLIU, HUAZHOU. "DIGITAL DIRECTION FINDING SYSTEM DESIGN AND ANALYSIS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060976413.
Повний текст джерелаDarwood, Peter B. "Pattern synthesis for small phased array antennas." Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262843.
Повний текст джерелаYeh, ShihYuan. "Development of a digital tracking array with single-channel RSNS and monopulse digital beamforming." Thesis, Monterey, California. Naval Postgraduate School, 2010. http://hdl.handle.net/10945/4956.
Повний текст джерелаUnmanned aerial vehicles (UAVs) are widely used in military applications, and one of the most common missions is remote sensing. Remote sensing requires UAVs equipped with different kinds of sensors. Information collected by remote sensors must be transmitted back to a ground control station (GCS) to conduct analysis. The majority of UAVs are controlled directly by GCS personnel using radio frequency (RF), line-of-sight (LOS) links. The ground antenna must acquire and then track the UAV signal. A digital phased array allows signal processing functions to be performed in the antenna processor as well as beamforming and tracking. The development of a digital tracking array with single-channel robust symmetrical number system (RSNS) and monopulse digital beamforming (DBF) to track a UAV's transmitted signal is described in this thesis. The RSNS is used as the direction finding (DF) algorithm and can provide high angle resolution with two closely spaced elements. However, as is typical for an array, the angle accuracy is reduced at the two ends of the field-of-view (FOV). The monopulse DBF is used to precisely track the signals. The monopulse tracking technique provides precise angle accuracy within a FOV of approximately ±45. The tracking system is developed in LabView, and the performance of a six-element prototype array is demonstrated by measurement in an anechoic chamber.
Kjellson, Angelica. "Sound Source Localization and Beamforming for Teleconferencing Solutions." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-89707.
Повний текст джерелаGod ljudkvalitet är en grundsten för lyckade telefonmöten. Miljön i ett konferens-rum medför ett flertal olika utmaningar för behandlingen av mikrofonsignalerna: det kan t.ex. vara brus och störningar, eller att den som talar befinner sig långt från telefonen. Målet med detta arbete är att förbättra den talsignal som tas upp av en konferenstelefon genom att implementera lösningar för lokalisering av talaren och riktad ljudupptagning med hjälp av ett flertal mikrofoner. De implementerade metoderna jämförs med en befintlig lösning och utvärderas under olika brusscenarion för en likformig cirkulär mikrofonkonstellation. För utvärderingen användes testsignaler som spelades in med en specialbyggd enhet. De implementerade algoritmerna kunde inte uppvisa en tillräcklig förbättring i jämförelse med den befintliga lösningen för att motivera den ökade beräkningskomplexitet de skulle medföra. Dessutom konstaterades att en fördubbling av antalet mikrofoner gav liten eller ingen förbättring på metoderna. Vilken typ av mikrofon som användes konstaterades däremot påverka resultatet och en subjektiv utvärdering indikerade en preferens för de rundupptagande mikrofonerna, en skillnad som föreslås undersökas vidare.
Khan, Asim Ali. "Performance optimisation of small antenna arrays." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/performance-optimisation-of-small-antenna-arrays(759e6929-04ab-408c-aee3-404c72711cdb).html.
Повний текст джерелаRuzindana, Mark William. "Real-Time Beamforming Algorithms for the Focal L-Band Array on the Green Bank Telescope." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6622.
Повний текст джерелаHickish, Jack. "Digital signal processing methods for large-N, low-frequency radio telescopes." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:7d983fb3-9411-4906-92cd-70e2c1040b54.
Повний текст джерелаPulipati, Sravan Kumar. "Electronically-Scanned Wideband Digital Aperture Antenna Arrays using Multi-Dimensional Space-Time Circuit-Network Resonance." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1499440141479455.
Повний текст джерелаBrady, James Michael. "Real-Time Beamformer Development and Analysis of Weak Signal Detection with Interference Mitigation for Phased-Array Feed Radio Astronomy." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5644.
Повний текст джерелаVadinský, Václav. "Systém pro lokalizaci vzdáleného zdroje zvuku s hradlovým polem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219812.
Повний текст джерелаArroyo, César Saulo Belli. "Estimação de imagens acústicas com arranjos de microfones." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-17062016-112717/.
Повний текст джерелаIn recent decades, noise pollution has become a major problem for society. It is for this reason that the industry has increased its efforts to reduce the emission of noise. To do this, it is important to find out which parts of the sound sources are emitting greater acoustic energy. Knowing the emission points is required to keep track of them and thus be able to reduce acoustic and environmental impact. Techniques such as \"beamforming\" and \"Near-Field Acoustic Holography\" (NAH) allow obtaining acoustic images. These images are obtained using an array of microphones located at a relative distance from a noise source. Once acquired experimental data, one can obtain the location and the magnitude of the main points of noise emission. Similarly, we can find aeroacoustic and vibroacoustic sources, because they are general-purpose tools. Usually, these types of sources work in different frequency bands of the emission. Recently, a Kronecker Array Transform (KAT) was developed to microphone arrays, which provides a significant reduction in computational cost when applied to various image reconstruction methods, provided that the microphones are distributed in a separable array. This thesis proposes perform measurements with real signals using different algorithms previously developed in a dissertation about the quality of the obtained results and computational complexity, and the development of alternatives for data processing when some microphones of the array are defective. To reduce the impact of failures in microphones and maintain the condition that the array is separable, one alternative has been developed to use the fast algorithms by removing only the defective microphones, so that the final results will be obtained taking into account every microphone of the array.
Toman, Vít. "Aplikace mikrofonního pole." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219961.
Повний текст джерелаNewmeyer, Luke Oliver. "Efficient FPGA SoC Processing Design for a Small UAV Radar." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7057.
Повний текст джерелаBrown, Stephen. "Analysis of performance of multiple beam digital beamforming antenna arrays by simulation /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488193665234131.
Повний текст джерелаMadishetty, Suresh. "Design of Multi-Beam Hybrid Digital Beamforming Receivers." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1545178805415923.
Повний текст джерелаMabrouk, Kais. "Conception et réalisation d'un système de Télécommunications MIMO avec Formation Numérique de Faisceaux en réception ; Calibrage aveugle du Démodulateur triphasé Zéro-IF et comparaison au démodulateur classique à 2 voies I et Q." Phd thesis, Télécom ParisTech, 2008. http://tel.archives-ouvertes.fr/tel-00409794.
Повний текст джерелаLa première partie de ce travail est consacrée à une étude comparative entre les différents types de démodulateurs cinq-port et triphasés. Cette étude a permis de mettre en évidence l'aspect tridimensionnel des démodulateurs cinq-port et triphasés, de gagner 20dB en termes de réjection des produits d'intermodulation des signaux adjacents et de trouver une nouvelle méthode de calibrage aveugle du récepteur.
La seconde partie de la thèse se concentre sur le prototypage d'un système MIMO. Cette phase nous a permis d'exposer les difficultés de mise en place de ce genre de système et de souligner les nouvelles problématiques qui n'apparaissait pas auparavant dans les systèmes mono- transcepteur. Aussi, un algorithme de Formation de Faisceau a été développé dans cette partie. Ce FF numérique a permis non seulement d'accroître la capacité mais aussi la qualité de liaison en considérant le système MIMO comme N système SIMO en parallèle. Comparativement à la technique ZF(Zero Forcing), nous démontrons que le FF permet d'obtenir une meilleure qualité de signaux pour des faibles valeurs de rapport signal à bruit.
Weesinghe, Weerasinha Sewwandi Wijayaratna. "FPGA Architectures for Fast Steerable Beam-Enhanced Digital Aperture Arrays." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407762895.
Повний текст джерелаTownsend, Phil. "Enhancements to the Generalized Sidelobe Canceller for Audio Beamforming in an Immersive Environment." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_theses/645.
Повний текст джерелаGalabada, Kankanamge Nilan Udayanga. "Digital 2-D/3-D Beam Filters For Adaptive Applebaum ReceiveAnd Transmit Arrays." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1445799928.
Повний текст джерелаShih, Huei-Hsu, and 施懷勛. "Ultrasound Array Signal Compression by Digital Micro-beamforming." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60761638536869426073.
Повний текст джерела國立臺灣大學
生醫電子與資訊學研究所
103
Due to the high computational requirements, conventionally real-time ultrasound imaging systems utilize highly parallel hardware architectures, thus resulting in high hardware cost, lack of flexibility on image optimization and algorithm implementation and relatively long system development cycle. On the other hand, a software-based system utilizing highly parallel graphic processing units (GPUs) can alleviate such limitations. However, massive raw data transmission from hardware end to software end, which is up to gigabytes per second, becomes one of the bottlenecks for performing real-time software-based imaging. For example, the popular USB 3.0 can only support data rate up to 0.5GB/s, which cannot support real-time raw data transfer. A feasible solution is to compress raw channel data with low hardware resource requirement on the front end. As previous studies demonstrated, we can get overall compression ratio of 4~5.6 by demodulating the radio frequency data to baseband and applying Walsh transform-based compression methods. However, more data compression is still desired. In this study, we propose the use of micro-beamforming to further compress the amplitude data with following steps: take the first N channels as a group, and delay the channel data based on pre-steering, then sum up the N channels into one single output. The rest of the channels follow the same procedures and the number of output channels can be suppressed by N times. In addition to data compression, we also propose a compensation method to decrease the errors resulting from the micro-beamformed amplitude data. Results show that when a group of 4 channels are used, B-mode images formed by the compressed data have almost the same spatial and contrast resolution as the original ones. Furthermore, the peak signal-to-noise ratio is higher than 50 dB with the application of the compensation method. Moreover, several aperture domain processing algorithms, including phase aberration correction, coherence-based adaptive weighting and color Doppler velocity estimation, were tested with micro-beamforming and reasonable performance is achieved. The proposed method integrates micro-beamforming and the compensation method into the Walsh transform-based architecture, and overall compression ratio was improved by about 27~59%, reaching an overall compression ratio up to 6.3~7.1, which enables real-time data transfer via an USB 3.0 interface. The increased resource utilization is no more than 5% on a Virtex-6 FPGA.