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Relevant bibliographies by topics / Low frequency radar / Dissertations / Theses

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Dissertations / Theses on the topic 'Low frequency radar'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Moes, Henderikus Jan. "A low noise PLL-based frequency synthesiser for X-band radar." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1337.

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2

Abd, Rashid Nur Emileen Binti. "Automatic vehicle classification in a low frequency forward scatter micro-radar." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3018/.

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Forward Scattering Radar (FSR) is a special case of bistatic radar configuration where the desired radar signal is formed via the shadowing of the direct (transmitter-to-receiver) signal by the target body. FSR offers a number of interests including an inherent ability to detect stealth target, absence of signal fluctuations, reasonably simple hardware, enhanced target radar cross-section (RCS) compared to traditional radar and capability to use Inverse Synthetic Aperture algorithms for Automatic Target Classification (ATC). Of course as any system FSR has its own drawbacks and limitations. Th

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3

Rivera, Suaña Javier Alvaro. "Design of a Low-Noise Amplifier for Radar Application in the 5 GHz Frequency Band." Thesis, Högskolan i Gävle, Elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-24570.

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The purpose of this project was to design and manufacture a Low-Noise Amplifier (LNA) working at a 5 GHz frequency band, by using High Electron Mobility Transistor (HEMT) from Avago Technologies. To improve our design, it was necessary to build a two-stage amplifier; one stage to work in minimum noise sensitivity, and another stage to get the maximum gain achievable by the transistor. This thesis work was carried out as a part of the UAV (Unmanned Aerial Vehicle) system project developed by a research group at the Radio communication and Microwave Electronics department, UMH.The project was de

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4

Malan, Frederich T. "Reduction of the antenna coupling in a bi-static, FM-CW radar system." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18029.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: A well-known problem with FM-CW radar systems is the leakage of transmitter power into the receiver which leads to the making of close-in targets, and can severely limit the system dynamic range performance. This thesis considers two solutions to this radar system problem for a low frequency radar operating in the VHF band. The first method to suppress coupling is using separate transmit and receive antennas designed in such a way as to reduce coupling between them. The second is to design a negative feedback loop as part of

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5

Monk, Andrew Michael. "Exploration into the Use of a Software Defined Radio as a Low-Cost Radar Front-End." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8742.

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Inspection methods for satellites post-launch are currently expensive and/or dangerous. To address this, BYU, in conjunction with NASA, is designing a series of small satellites called CubeSATs. These small satellites are designed to be launched from a satellite and to visually inspect the launching body. The current satellite revision passively tumbles through space and is appropriately named the passive inspection cube satellite (PICS). The next revision actively maintains translation and rotation relative to the launching satellite and is named the translation, rotation inspection cube sate

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6

Inácio, Ana Inês Silva. "Linearizing an L-band power amplifier for RADAR applications." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/13410.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>This thesis attempts to improve the linearity, while keeping the efficiency, of a given power amplifier to be used in RADAR applications. The thesis is divided in three major parts: first, the theoretical analysis around the chosen linearization technique is done by mathematical deduc-tion and MATLAB simulations. In second place, ADS simulations with low-frequency dithering applied to an amplifier model, provided by the man¬ufacturer of the amplifier, are performed. The desired characteristics found during simulations will be used on the

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7

Lauterbach, Adam Peter. "Low-cost SiGe circuits for frequency synthesis in millimeter-wave devices." Australia : Macquarie University, 2010. http://hdl.handle.net/1959.14/76626.

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"2009"<br>Thesis (MSc (Hons))--Macquarie University, Faculty of Science, Dept. of Physics and Engineering, 2010.<br>Bibliography: p. 163-166.<br>Introduction -- Design theory and process technology -- 15GHz oscillator implementations -- 24GHz oscillator implementation -- Frequency prescaler implementation -- MMIC fabrication and measurement -- Conclusion.<br>Advances in Silicon Germanium (SiGe) Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) technology has caused a recent revolution in low-cost Monolithic Microwave Integrated Circuit (MMIC) design. -- This thesis presents the design,

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8

Jansson, J. P. (Jussi-Pekka). "A stabilized multi-channel CMOS time-to-digital converter based on a low frequency reference." Doctoral thesis, Oulun yliopisto, 2012. http://urn.fi/urn:isbn:9789514299322.

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Abstract The aim of this work was to improve the performance and usability of a digital time-to-digital converter (TDC) in CMOS technology. The characteristics of the TDC were improved especially for the needs of pulsed laser time-of-flight (TOF) distance measurement, where picosecond-level precision with a long µs-level measurement range is needed in order to approach mm-level measurement accuracy. Stability in the face of process, voltage and temperature variations, multiple measurement channels, alternative measurement modes, a high integration level, standard interfaces and simple usage we

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9

Thrivikraman, Tushar. "Analysis and Design of Low-Noise Amplifiers in Silicon-Germanium Hetrojunction Bipolar Technology for Radar and Communication Systems." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19755.

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This thesis presents an overview of the simulation, design, and measurement of state-of-the-art Silicon-Germanium Hetro-Junction Bipolar Transistor (SiGe HBT) low-noise amplifiers (LNAs). The LNA design trade-off space is presented and methods for achieving an optimized design are discussed. In Chapter 1, we review the importance of LNAs and the benefits of SiGe HBT technology in high frequency amplifier design. Chapter 2 introduces LNA design and basic noise theory. A graphical LNA design approach is presented to aid in understanding of the high-frequency LNA design process. Chapter 3

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10

Bolucek, Muhsin Alperen. "Design And Implementation Of Low Phase Noise Phase Locked Loop Based Local Oscillator." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611353/index.pdf.

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In this thesis, a low phase noise local oscillator operating at 2210 MHz is designed and implemented to be used in X-Band transmitter of a LEO satellite. Designed local oscillator is a PLL (Phase Locked Loop) based frequency synthesizer which is implemented using discrete commercial components including ultra low noise voltage controlled oscillator and high resolution, low noise fractional-N synthesizer. Operational settings of the synthesizer are done using three wire serial interface of a microcontroller. Although there are some imperfections in the implementation, phase noise of the prototy

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11

Morton, Matthew Allan. "Development of Monolithic SiGe and Packaged RF MEMS High-Linearity Five-bit High-Low Pass Phase Shifters for SoC X-band T/R Modules." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16190.

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A comprehensive study of the High-pass/Low-pass topology has been performed, increasing the understanding of error sources arising from bit layout issues and fabrication tolerances. This included a detailed analysis of error sources in monolithic microwave phase shifters due to device size limitations, inductor parasitics, loading effects, and non-ideal switches. Each component utilized in the implementation of a monolithic high-low pass phase shifter was analyzed, with its influence on phase behavior shown in detail. An emphasis was placed on the net impact on absolute phase variation, which

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12

Fakhfakh, Seifeddine. "Nouvelles méthodes de caractérisation et de modélisation non-linéaire électrothermique des effets de piège dans la technologie HEMT GaN pour l’étude de la stabilité pulse à pulse dans les applications radar." Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0103/document.

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La capacité d’un émetteur radar à assurer la bonne détection des cibles mouvantes sans générer de fausses alertes dépend principalement de sa stabilité pulse à pulse qui est affectée par de nombreux facteurs tels que les effets mécaniques, thermiques et électriques. Cependant, la stabilité pulse à pulse d’un émetteur radar à impulsions est liée à celle de ses amplificateurs de puissance, et plus particulièrement à la technologie des dispositifs actifs. Dans ce sens, ce travail présente une analyse de ce critère radar au plus près du composant (au niveau d’un transistor HEMT GaN) dans le cas d’

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13

Shi, Xueling. "Occurrence Statistics and Driving Mechanisms of Ionospheric Ultra-Low Frequency Waves Observed by SuperDARN Radars." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/100904.

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Ultra-low frequency (ULF; 1 mHz - 1 Hz) waves are known to play an important role in the transfer of energy from the solar wind to Earth's magnetosphere and ionosphere. The Super Dual Auroral Radar Network (SuperDARN) is an international network consisting of 35 low-power high frequency (HF: 3-30 MHz) coherent scatter radars at middle to polar latitudes that look into Earth's upper atmosphere and ionosphere. In this study, we use Doppler velocity measurements obtained by the SuperDARN radars and coordinated spacecraft observations to investigate the occurrence statistics and driving mechanisms

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14

Zelenke, Brian Christopher. "An empirical statistical model relating winds and ocean surface currents : implications for short-term current forecasts." Thesis, Connect to the title online, 2005. http://hdl.handle.net/1957/2166.

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15

Saleh, Oliver S. "Adaptive Processing in High Frequency Surface Wave Radar." Thesis, 2008. http://hdl.handle.net/1807/17219.

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High-Frequency Surface Wave Radar (HFSWR) is a radar technology that offers numerous advantages for surveillance of coastal waters beyond the exclusive economic zone. However, target detection and tracking is primarily limited by ionospheric interference. Ionospheric clutter is characterized by a high degree of nonhomogeneity and nonstationarity, which makes its suppression difficult using conventional processing techniques. Space-time adaptive processing techniques have enjoyed great success in airborne radar, but have not yet been investigated in the context of HFSWR. This thesis is primaril

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16

Yang, Shang-Te. "Imaging humans with Doppler radar using a low-complexity frequency-scanned antenna." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4510.

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In this work, a low-complexity two-dimensional (2D) frequency-scanned antenna is proposed to image a human using a Doppler radar. It consists of two back-to-back, air-filled microstrip leaky wave antennas (LWAs). The frequency-scanned pattern of the microstrip LWA is used to determine the target bearing in one dimension. Two such elements are used as an interferometer to determine the target bearing in the other dimension. In order to pack two LWAs closely, a design is proposed to achieve a minimal disturbance on the azimuth and elevation beam patterns. The design is measured with both static

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17

Lin, Hsin-Chen, and 林欣晨. "Millimeter-Wave CMOS Low-Noise Amplifier and Frequency Synthesizer for Radar Sensor Applications." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/41853691594727298625.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>103<br>The purpose of this thesis is to design and implement the W-band low-noise amplifiers, injection-locked frequency divider and frequency synthesizer. The thesis can be divided into four parts： In the first part, a 77~81 GHz low noise amplifier is designed for W-band system. In order to achieve the highest values, we design a three stage cascade amplifier. In the previous two stages we use a cascade circuit and the other stage we use a current source circuit which can increase the signal intensity. Then we use “T-matching” technique at both input and output ter

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18

"An investigation of ultra low frequency (ULF) pulsations using radar data and solar wind data." Thesis, 2010. http://hdl.handle.net/10413/1073.

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19

Jacobi, Christoph. "Zonal prevailing wind trends derived from combined low-frequency and VHF meteor radar wind measurements in the lower thermosphere over Collm (51.3°N, 13.0°E)." 2014. https://ul.qucosa.de/id/qucosa%3A16434.

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Mesopause region winds have been measured by the low-frequency (LF) method at Collm until 2008. Since 2004, meteor radar (MR) measurements have been performed also. The LF and MR data set are combined to obtain a continuous time series of monthly zonal prevailing winds from 1979 through 2013 at about 90 km altitude. It has been found that, on a monthly time scale, the difference between zonal prevailing winds measured by LF and MR are small. During the 35-yr time interval considered, the zonal winds show positive trends towards more westerly winds throughout the year except for spring. There i

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