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Tesi sul tema "Radio astronomy"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Van, Tonder Vereese. "Beamforming for radio astronomy." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96126.

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Thesis (MEng) -- Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Beamforming is a technique used to combine signals from an array of antennas to effectively synthesize a single aperture and beam. In the Radio Astronomy community the technique is used to obtain a desirable beam pattern as well as to electronically point the beam of an array. Next generation radio telescopes such as the Square Kilometre Array (SKA) surpass current technology and will extensively make use of beamforming techniques. Various factors determine the output of a beamformer; however, given an array with a fixe

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2

Junklewitz, Henrik. "Statistical inference in radio astronomy." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-177457.

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This thesis unifies several studies, which all are dedicated to the subject of statistical data analysis in radio astronomy and radio astrophysics. Radio astronomy, like astronomy as a whole, has undergone a remarkable development in the past twenty years in introducing new instruments and technologies. New telescopes like the upgraded VLA, LOFAR, or the SKA and its pathfinder missions offer unprecedented sensitivities, previously uncharted frequency domains and unmatched survey capabilities. Many of these have the potential to significantly advance the science of radio astrophysics a

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3

Thompson, Nicholas Christopher. "RFI mitigation in radio astronomy." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86637.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Technical advances in electromagnetics, signal processing and processing power have led to a significant increase in sensitivity and accuracy in radio telescopes. With this increase in sensitivity, radio frequency interference (RFI) has become a much larger problem. The notable growth in wireless communication as well as self generated RFI has further escalated this problem. In order to utilise the full capabilities of modern radio telescopes, RFI mitigation is required on the captured signals. With the enormous data rate

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4

Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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5

Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." University of Sydney. Physics, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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6

Bock, Douglas Carl-Johan. "Wide Field Aperture Synthesis Radio Astronomy." University of Sydney. Physics, 1998. http://hdl.handle.net/2123/377.

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This thesis is focussed on the Molonglo Observatory Synthesis Telescope (MOST), reporting on two primary areas of investigation. Firstly, it describes the recent upgrade of the MOST to perform an imaging survey of the southern sky. Secondly, it presents a MOST survey of the Vela supernova remnant and follow-up multiwavelength studies. The MOST Wide Field upgrade is the most significant instrumental upgrade of the telescope since observations began in 1981. It has made possible the nightly observation of fields with area ~5 square degrees, while retaining the operating frequency of

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7

Ngongoni, Chipo Nancy. "Neural cross-correlation for radio astronomy." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/11427.

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Includes abstract.<br>Includes bibliographical references (leaves 56-62).<br>Correlation engines are essential elements of most signal processing systems. Areas of applicability include image processing, speech synthesis and analysis, high energy physics, wireless and mobile communication systems, spread spectrum communication systems and even prosthetics. Finding cost effective and computationally less intensive engines is the thrust of most research. Neural networks have also been used as aids in making complex tasks relatively easy to process.

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8

Manley, Jason Ryan. "A scalable packetised radio astronomy imager." Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15573.

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Includes bibliographical references<br>Modern radio astronomy telescopes the world over require digital back-ends. The complexity of these systems depends on many site-specific factors, including the number of antennas, beams and frequency channels and the bandwidth to be processed. With the increasing popularity for ever larger interferometric arrays, the processing requirements for these back-ends have increased significantly. While the techniques for building these back-ends are well understood, every installation typically still takes many years to develop as the instruments use highly spe

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9

Bock, Douglas Carl-Johan. "Wide Field Aperture Synthesis Radio Astronomy." Thesis, The University of Sydney, 1997. http://hdl.handle.net/2123/377.

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This thesis is focussed on the Molonglo Observatory Synthesis Telescope (MOST), reporting on two primary areas of investigation. Firstly, it describes the recent upgrade of the MOST to perform an imaging survey of the southern sky. Secondly, it presents a MOST survey of the Vela supernova remnant and follow-up multiwavelength studies. The MOST Wide Field upgrade is the most significant instrumental upgrade of the telescope since observations began in 1981. It has made possible the nightly observation of fields with area ~5 square degrees, while retaining the operating frequency of

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10

Carozzi, Tobia. "Radio waves in the ionosphere : Propagation, generation and detection." Doctoral thesis, Uppsala universitet, Institutionen för astronomi och rymdfysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1184.

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We discuss various topics concerning the propagation, generation, and detec-tionof high-frequency (HF) radio waves in the Earth's ionosphere. With re-gardsto propagation, we derive a full wave Hamiltonian and a polarization evo-lutionequation for electromagnetic waves in a cold, stratified magnetoplasma.With regards to generation, we will be concerned with three experiments con-ducted at the ionosphere- radio wave interaction research facilities at Sura, Rus-siaand Tromsø, Norway. These facilities operate high power HF transmittersthat can inject large amplitude electromagnetic waves into the

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11

Zhang, Guoyong. "Superconducting microwave components for radio astronomy applications." Thesis, University of Birmingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435303.

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12

Janes, Clinton C. "The Impact of Telemetry on Radio Astronomy." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608408.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada<br>The National Radio Astronomy Observatory (NRAO) operates the Very Large Array (VLA) Radio Observatory in New Mexico, and the Very Long Baseline Array (VLBA) with 10 radio antenna in locations from Hawaii to St. Croix, as well as other radio telescopes at Green Bank, West Virginia, and the 12 meter radio antenna near Tucson, AZ. Although radio frequency (RF) bands have been set aside for passive use by these radio telescopes, harmful interference from increased demands on

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13

Kennedy, Paul Robert. "Superconducting devices for millimetre-wavelength astronomy." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386169.

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14

Mena, Juan. "A radio-frequency-over-fiber link for large-array radio astronomy applications." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121390.

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The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a specialized array of cylindrical radio telescopes that will study the nature of dark energy by mapping the three-dimensional distribution of neutral hydrogen gas in the universedetected from redshifted 21 cm radiation. CHIME will measure the characteristic Baryon Acoustic Oscillation (BAO) scale across the key redshift range z~0.8 to z~2.5 where the expansion history of the universe changes from one dominated by the attractive force of ordinary gravity to one dominated by dark energy. While characterizing the CHIME analog receiver

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15

Price, Daniel Charles. "Radio astronomy instrumentation for redshifted hydrogen line science." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:3185b622-9aba-4c0f-995b-eceb50a5a49c.

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This thesis presents instrumentation with which to measure the abundance of neutral hydrogen gas in the Universe. Measuring where the Universe’s hydrogen is, and tracing how its distribution evolves with time, holds the key to understanding how galaxies evolve, the nature of dark energy, and how the first cosmic structures formed. In particular, this thesis looks at instrumentation for 21-cm intensity mapping telescopes. In 21-cm intensity mapping, the collective emission of many galaxies is measured, without individual detections. This technique promises to allow detection of the baryonic aco

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16

Hugo, Benjamin. "Fast online predictive compression of radio astronomy data." Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/21225.

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This report investigates the fast, lossless compression of 32-bit single precision floating-point values. High speed compression is critical in the context of the MeerKAT radio telescope currently under construction in Southern Africa and Australia, which will produce data at rates up to 1 Petabyte every 20 seconds. The compression technique being investigated is based on predictive compression, which has proven successful at achieving high-speed compression in previous research. Several different predictive techniques (which includes polynomial extrapolation), along with CPU- and GPU-b

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17

Mootoovaloo, Arrykrishna. "Bayesian model selection with applications to radio astronomy." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/27492.

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This thesis consists of two main parts, both of which focus on Bayesian methods and the problem of model selection in particular. The first part investigates a new approach to computing the Bayes factor for model selection without needing to compute the Bayesian evidence, while the second part shows, through an analytical calculation of the Bayesian evidence, that Bayesian methods allow two point sources to be distinguished from a single point source at angular separations that are much smaller than the naive beam size at high signal to noise. In the first part, the idea is to create a supermo

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18

McMahon, Peter Leonard. "Adventures in radio astronomy instrumentation and signal processing." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5165.

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Includes abstract.<br>Includes bibliographical references (leaves 117-119).<br>This thesis describes the design and implementation of several instruments for digitizing and processing analogue astronomical signals collected using radio telescopes. Modern radio telescopes have significant digital signal processing demands that are typically best met using custom processing engines implemented in Field Programmable Gate Arrays. These demands essentially stem from the ever-larger analogue bandwidths that astronomers wish to observe, resulting in large data volumes that need to be processed in rea

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19

Van, Vuuren Lukas Martin. "Design of a receiver system for use in radio astronomy." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96800.

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20

Choeysakul, Chittawan. "Small reverberation chambers for radio frequency emission measurements: a radio astronomy feasibility study." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/2136.

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To use a Reverberation Chamber (RC) below the Lowest Usable Frequency, this thesis applies: multiple receiving antennas; multiple EUT positions; and a modified validation procedure. Emission measurements are then possible down to the first cavity resonance. The design is based on theory and simulations, and validated by on a prototype. The longer measurement times, compare to conventional RCs are acceptable where sensitivity is of concern, e.g. in radio astronomy or defence applications.

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21

Roberts, Paul Philip. "Components for Wide Bandwidth Signal Processing in Radio Astronomy." University of Sydney. Electrical Engineering, 2003. http://hdl.handle.net/2123/603.

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In radio astronomy wider observing bandwidths are constantly desired for the reasons of improved sensitivity and velocity coverage. As observing frequencies move steadily higher these needs become even more pressing. In order to process wider bandwidths, components that can perform at higher frequencies are required. The chief limiting component in the area of digital spectrometers and correlators is the digitiser. This is the component that samples and quantises the bandwidth of interest for further digital processing, and must function at a sample rate of at least twice the operating ban

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22

Foster, Griffin. "Large-N correlator systems for low frequency radio astronomy." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:2bca41ff-ec75-4a41-a634-c5bbbceae434.

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Low frequency radio astronomy has entered a second golden age driven by the development of a new class of large-N interferometric arrays. The low frequency array (LOFAR) and a number of redshifted HI Epoch of Reionization (EoR) arrays are currently undergoing commission and regularly observing. Future arrays of unprecedented sensitivity and resolutions at low frequencies, such as the square kilometer array (SKA) and the hydrogen epoch of reionization array (HERA), are in development. The combination of advancements in specialized field programmable gate array (FPGA) hardware for signal process

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23

Staats, Kai. "Genetic programming applied to RFI mitigation in radio astronomy." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/23703.

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Genetic Programming is a type of machine learning that employs a stochastic search of a solutions space, genetic operators, a fitness function, and multiple generations of evolved programs to resolve a user-defined task, such as the classification of data. At the time of this research, the application of machine learning to radio astronomy was relatively new, with a limited number of publications on the subject. Genetic Programming had never been applied, and as such, was a novel approach to this challenging arena. Foundational to this body of research, the application Karoo GP was developed i

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24

Pollak, Alexander Werner. "Receiver technology for radio astronomy and deep space communications." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:c37da004-c428-49ca-8097-deae9f1ed8f7.

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This thesis presents the design and development of a complete receiver system for a conversion project, which replaces the commercial receiver of a telecommunication antenna with a cryogenically cooled radio astronomy receiver. Part of the project is to explore the synergy between radio astronomy and deep-space communications, which share many technical requirements, but also have technical conflicts. Therefore, this thesis attempts to solve some of these technological issues and provides a design for a receiver system, where radio astronomy and communication applications can successfully shar

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25

Bukilic, Nino. "Wide bandwidth focal plane array receiver for radio astronomy." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/2331.

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Reflective antennas equipped with phase array feeds (PAFs) have been proposed as part of the Square Kilometre Array reference design, since they offer a wide Field of View (FoV) and large collecting area. To achieve a contiguous FoV, and to cancel spill-over radiation, the Focal Plane Array (FPA) must sample the focal field of the reflector at least every half-wavelength at the upper operating frequency. Low-noise operation over a wide bandwidth requires appropriate impedance matching to the low-noise amplifiers, and this is a challenging research problem since the input impedance of the FPA e

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26

Maciel, Tamela. "Radio source evolution." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708637.

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27

Sihlangu, Isaac. "The MeerKAT Radio Frequency Interference Environment." Master's thesis, Faculty of Science, 2019. https://hdl.handle.net/11427/31748.

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Radio signals from astronomical sources are extremely weak and easily distorted/- corrupted or overwhelmed by man-made radio signals such as cellphones, satellites, aircraft and telescope electronics. These Radio Frequency Interference (RFI) are increasingly threatening radio observatories due to our increasingly technological world. To detect and mitigate RFI, observatories need to understand their RFI environment, what contributes to it and how it is changing. While there are few dedicated RFI monitoring systems on the MeerKAT site, the most sensitive RFI detector is the MeerKAT array itself

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28

Abdalla, Filipe B. "Cosmological constraints with future radio surveys." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.711600.

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Wu, Nailong. "The maximum entropy method and its application in radio astronomy." Thesis, The University of Sydney, 1985. https://hdl.handle.net/2123/27440.

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This thesis consists of seven chapters, two appendices and a bibliography. In addition, three publications are included. The first digit in the page numbers refers to the chapter or appendix, and the second one or two digits are the serial numbers of the page in the chapter or appendix. For equations, figures and tables, the first digit and the second one or two digits refer respectively to the chapter and section; the third one or two digits refer to its serial occurrence in the chapter. The references in the bibliography are listed in alphabetical order by the author. Mathematical symbols ar

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30

Junklewitz, Henrik [Verfasser], and Simon [Akademischer Betreuer] White. "Statistical inference in radio astronomy / Henrik Junklewitz. Betreuer: Simon White." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1065610122/34.

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31

Lukic, Vesna [Verfasser], and Marcus [Akademischer Betreuer] Brüggen. "Deep learning in Radio Astronomy / Vesna Lukic ; Betreuer: Marcus Brüggen." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1201821282/34.

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32

Agar, Jon. "Screening science : spatiality and authority at a radio astronomy observatory." Thesis, University of Kent, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309750.

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33

Goodrick, Lee. "Image reconstruction in radio astronomy with non-coplanar synthesis arrays." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96902.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: Traditional radio astronomy imaging techniques assume that the interferometric array is coplanar, with a small field of view, and that the two-dimensional Fourier relationship between brightness and visibility remains valid, allowing the Fast Fourier Transform to be used. In practice, to acquire more accurate data, the non-coplanar baseline effects need to be incorporated, as small height variations in the array plane introduces the w spatial frequency component. This component adds an additional phase shift to the incomin

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34

Poulsen, Andrew Joseph. "Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd238.pdf.

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35

Diao, Junming. "High-Sensitivity Phased Arrays for Radio Astronomy and Satellite Communications." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6546.

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Radio astronomy is used to study stars, galaxies, black holes and gas clouds radiation at radio frequencies. Detecting extremely weak signals from deep space radio sources requires high sensitive feed system associated with large dish antennas. The key figure of merit is survey speed, or the time required to map a region of the sky to a given source flux density. Survey speed is proportional to the frequency bandwidth, the field of view or observable region of the sky, and the squared sensitivity, where sensitivity is related to reflector aperture efficiency and system noise temperature. Compa

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36

Alvear, Cabezón Andrés Arturo. "Ultra-pure digital detection of polarization for radio astronomy applications." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/167849.

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Magíster en Ciencias de la Ingeniería, Mención Ingeniería Eléctrica<br>Polarization is a key measurement within radio astronomy because its state can give insight as to the physical conditions of the source and the medium the radiation has traveled through. In radio astronomy receivers, the device used to separate the polarization is known as an Ortho-Mode Transducer (OMT). The OMT is a passive component that separates signals into two orthogonal components. Using available millimeter-wave analog technology, wideband heterodyne receiver systems generally obtain polarization isolation ratios

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37

Buchan, James. "Mitigating Electromagnetic Interference in Power Converters for Radio Astronomy Applications." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/88250.

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Computational studies and a prototype half-bridge DC-DC converter capable of logistic-shaped switching transitions to achieve high-frequency electromagnetic interference mitigation is presented. The logistic-shaped transition provides steep spectral content roll-off, which is desirable for low noise outcomes. The research demonstrates that shaped switching transitions can be integrated into power converters operating with pulse with modulation control strategies, which is desirable for low noise applications such as radio astronomy.

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38

Rees, Nicholas Peter. "The 38 MHz radio survey." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315316.

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39

Woermann, Beate. "Radio observation of the Gum Nebula Region." Thesis, Rhodes University, 1997. http://hdl.handle.net/10962/d1005271.

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This thesis describes the results of an investigation of the physical properties of the Gum Nebula. For this investigation a radio continuum map of the region was made at 2326 MHz and resolution ⅓° with the HartRAO antenna. This map was used to generate spectral index images and an infrared to radio flux density ratio (IRR) image. The latter image shows that the IRR of the nebula is in the range 20 to 250, identifying it as an old SNR. Several spectral index images of this region were generated using two different methods, one based on the isolation of the nebula from its background radiation,

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40

Unewisse, Anne Margaret. "Radio emission from southern clusters of galaxies." Thesis, The University of Sydney, 1993. https://hdl.handle.net/2123/26671.

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Radio, optical, far-infrared and X-ray sources lying towards galaxy clusters listed in the southern portion of the Abell, Corwin and Olowin rich cluster catalogue (ACO) are presented. The bulk of the observational work is a radio survey of 39 nearby (distance class D < 3) southern ACO clusters undertaken at 843MHz with the Molonglo Observatory Synthesis Telescope. Also included are studies of 408MHz MRC radio sources and 60 pm IRAS far-infrared sources in the direction of ACO clusters. The survey results are presented in two forms: i) as a series of radio images, centred on each surveyed c

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41

West, Craig James, and cwest@astro swin edu au. "Development of disk-based baseband recorders and software correlators for radio astronomy." Swinburne University of Technology. Centre for Astrophysics and Supercomputing, 2004. http://adt.lib.swin.edu.au./public/adt-VSWT20050804.143155.

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This thesis details work undertaken in the field of radio astronomy instrumentation. Specific components of the data collection and processing systems used by radio astronomers have been implemented using non-traditional approaches. Traditionally, the correlation of radio astronomy data has taken place on dedicated, specific hardware. This thesis deals with the implementation of equivalent correlators using software running on generic clusters of personal computers - the software approach to radio astronomy. Toward this end a system has been developed that records the raw telescope output onto

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42

Clark, Neil Edward. "Jet-cloud interactions in powerful radio galaxies." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389730.

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McGilchrist, Mark Mungo. "The first 7C survey of radio sources." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303245.

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44

Campbell, Jacob L. "The Development of a Small Scale Radio Astronomy Image Synthesis Array for Research in Radio Frequency Interference Mitigation." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1014.pdf.

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45

Breton, René. "Radio pulsars in binary systems." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40755.

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This thesis focuses on the study of binary radio pulsars, their evolution and some specific use of their properties to investigate fundamental physics such as general relativity and other gravitational theories. The work that we present here is organized in three main parts. First, we report on the study of PSR J1744-3922, a binary pulsar presenting a peculiar `flickering' flux behavior as well as spin and orbital properties that do not correspond to the expectations of standard evolution scenarios. We investigated the nature of this flux behavior. We also studied the pulsar's properties in r

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46

Bannister, Keith. "Radio transients: Surveys and Techniques." Thesis, The University of Sydney, 2011. http://hdl.handle.net/2123/13293.

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I present two pilot surveys and a range of new algorithms to aid in planning and implementing wide-field radio surveys for transient and variable sources. The first pilot survey is a blind survey for transient and variable radio sources with the Molonglo Observatory Synthesis Telescope at 843~MHz. This survey discovered 53 highly variable sources and 15 transient sources and determined surface densities of $0.268 \unit{deg^{-2}}$ for variable sources and $1.3 \times 10^{-2} \unit{deg^{-2}}$ for transient sources, with associated timescales of between one day and three years. I also propose two

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47

Mauch, Thomas. "Radio Sources in the Local Universe." University of Sydney, 2006. http://hdl.handle.net/2123/928.

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Doctor of Philosophy<br>This thesis presents a census of radio sources selected from the NRAO (National Radio Astronomy Observatory) VLA (Very Large Array) Sky Survey (NVSS) and Sydney University Molonglo Sky Survey (SUMSS) catalogues which have also been observed in the first data release of the 6 degree Field Galaxy Survey (6dFGS), a galaxy redshift survey of the local universe. Radio detections were found for 4,506 galaxies in the 6dFGS near-infrared-selected primary sample, a radio detection rate of 16%. A further 1,196 radio sources were observed by 6dF which were missing from the 6dFGS p

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48

Mauch, Thomas. "Radio Sources in the Local Universe." Thesis, The University of Sydney, 2005. http://hdl.handle.net/2123/928.

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Abstract (sommario):

This thesis presents a census of radio sources selected from the NRAO (National Radio Astronomy Observatory) VLA (Very Large Array) Sky Survey (NVSS) and Sydney University Molonglo Sky Survey (SUMSS) catalogues which have also been observed in the first data release of the 6 degree Field Galaxy Survey (6dFGS), a galaxy redshift survey of the local universe. Radio detections were found for 4,506 galaxies in the 6dFGS near-infrared-selected primary sample, a radio detection rate of 16%. A further 1,196 radio sources were observed by 6dF which were missing from the 6dFGS primary sample either bec

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49

Botai, Ondego Joel. "Ionospheric total electron content variability and its influence in radio astronomy." Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005258.

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Ionospheric phase delays of radio signals from Global Positioning System (GPS) satellites have been used to compute ionospheric Total Electron Content (TEC). An extended Chapman profle model is used to estimate the electron density profles and TEC. The Chapman profle that can be used to predict TEC over the mid-latitudes only applies during day time. To model night time TEC variability, a polynomial function is fitted to the night time peak electron density profles derived from the online International Reference Ionosphere (IRI) 2001. The observed and predicted TEC and its variability have bee

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50

Van, der Merwe Carel. "Culprit and victim management RFI environment for a radio astronomy site." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19987.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A methodology is developed to manage the large number of RFI Culprits on a new Radio Telescope location such as the South African site being developed in the Karoo, both during construction and ongoing operations. The requirement for RFI control is presented, with brief reference to the more traditional methods used by other Radio Telescope observatories. The new approach is then presented, based on methods used in the engineering field of Logistic Engineering. Three case studies are used to illustrate how the approach

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