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Rozprawy doktorskie na temat „Radio telescopes”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 29 lipca 2024

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1

Witzemann, Amadeus. "Cosmology with next generation radio telescopes." University of the Western Cape, 2019. http://hdl.handle.net/11394/6936.

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Philosophiae Doctor - PhD<br>The next generation of radio telescopes will revolutionize cosmology by providing large three-dimensional surveys of the universe. This work presents forecasts using the technique 21cm intensity mapping (IM) combined with results from the cosmic microwave background, or mock data of galaxy surveys. First, we discuss prospects of constraining curvature independently of the dark energy (DE) model, finding that the radio instrument HIRAX will reach percent-level accuracy even when an arbitrary DE equation of state is assumed. This is followed by a study of the

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Leung, Martin. "A wideband feed for a cylindrical radio telescope." Phd thesis, School of Physics, 2008. http://hdl.handle.net/2123/5005.

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Thesis (Ph. D.)--University of Sydney, 2008.<br>Includes graphs and tables. Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Physics, Faculty of Science. Bibliography: p. 196-203. Also available in print form.

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3

Mountfort, Peter Ian. "The observation of extended sources with the Hartebeesthoek radio telescope." Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1005265.

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The Hartebeesthoek Radio Telescope is well suited to mapping large areas of sky at 2.3 GHz because of the stability and sensitivity of the noise-adding radiometer (Nicolson, 1970) and cryogenic amplifier used at this frequency, the relatively large 20' beam of the 26 m dish antenna, and its high-speed drive capability. Telescope control programs were written for the Observatory's online computer for automated mapping. Effort centred on removing the curved baseline or 'background' from each Declination (Dec) scan, due to atmospheric and ground radiation contributions varying as the antenna is s

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4

Zwart, Jonathan Tarquin Lawrence. "Preparing for blind surveys with the Arcminute Microkelvin Imager." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613300.

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Kaneko, Takeshi. "The Arcminute Microkelvin Imager (AMI)." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615182.

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Holler, Christian Matthias. "Correlator and antenna design for the Arcminute Microkelvin Imager (AMI)." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619994.

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Hurley-Walker, Natasha. "Targeted science observations with the Arcminute Microkelvin Imager (AMI)." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608480.

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8

Culverhouse, Thomas Louis. "Science targets for the Arcminute Microkelvin Imager." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613801.

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9

Tiplady, Adrian John. "Modeling and measurement of torqued procession in radio pulsars." Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1005260.

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The long term isolated pulsar monitoring program, which commenced in 1984 using the 26 m radio telescope at the Hartebeeshoek Radio Astronomy Observatory (HartRAO), has produced high resolution timing residual data over long timespans. This has enabled the analysis of observed spin down behaviour for 27 braking pulsars, most of which have dataspans longer than 14 years. The phenomenology of observed timing residuals of certain pulsars can be explained by pseudo periodic effects such as precession. Analytic and numerical models are developed to study the kinematic and dynamic behaviour of isola

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10

Franke, Timothy Joseph. "Identification and Cancellation of Harmonic Disturbances in Radio Telescopes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1427897871.

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11

Wong, Oiwei Ivy. "Star formation and galaxy evolution of the local universe based on HIPASS /." Connect to thesis, 2007. http://eprints.unimelb.edu.au/archive/00004069.

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12

Manners, Paul John. "Measuring the RFI environment of the South African SKA site." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005259.

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The Square Kilometre Array (SKA) Project is an international effort to build the world’s largest radio telescope. It will be 100 times more sensitive than any other radio telescope currently in existence and will consist of thousands of dishes placed at baselines up to 3000 km. In addition to its increased sensitivity it will operate over a very wide frequency range (current specification is 100 MHz - 22 GHz) and will use frequency bands not primarily allocated to radio astronomy. Because of this the telescope needs to be located at a site with low levels of radio frequency interference (RFI).

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13

Wiid, P. Gideon. "Lightning protection and radio frequency interference mitigation for the Karoo Array Telescope." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4009.

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Thesis (PhD (Electrical and Electronic Engineering))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: South Africa and Australia are now the two remaining countries bidding for the Square Kilometre Array (SKA), the biggest and most sensitive project ever undertaken in radio astronomy. The South African SKA is demonstrating its technology capabilities through the Karoo Array Telescope (KAT or MeerKAT). The development of KAT is taking place in stages to optimise design and minimise risks at each stage. An array of seven 12 m antennas will be complete by the end of 2009, called KAT-

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14

Schammel, Michel Philippe. "Blind Sunyaev-Zel'dovich survey with the Arcminute Microkelvin Imager." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648243.

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15

Daniel-Tran, Philo Vinita. "A study of antenna design concepts for future large radio telescopes /." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030930.163911/index.html.

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16

Young, Andre. "Improving the direction-dependent gain calibration of reflector antenna radio telescopes." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80915.

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Thesis (PhD)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Utilising future radio interferometer arrays, such as the Square Kilometre Array (SKA), to their full potential will require calibrating for various direction- dependent effects, including the radiation pattern (or primary beam in the parlance of radio astronomers) of each of the antennas in such an array. This requires an accurate characterisation of the radiation patterns at the time of observation, as changing operating conditions may cause substantial variation in these patterns. Furthermore, fundamental imaging limits, a

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17

Hickish, 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.

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Current attempts to make precision measurements of the HI power spectrum at high redshifts have led to the construction of several low-frequency, large-N, interferometric arrays. The computational demands of digital correlators required by these arrays present a significant challenge. These demands stem from the treatment of radio telescopes as collections of two-element interferometers, which results in the need to multiply O(N<sup>2</sup>) pairs of antenna signals in an N-element array. Given the unparalleled flexibility offered by modern digital processing systems, it is apt to consider whe

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18

Долгушев, М. "Телескоп". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/38880.

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Современную астрономию невозможно представить без зрительных труб (телескопов). Уже Галилей, первым применивший зрительную трубу для наблюдения небесных тел, сделал ряд важных открытий. Хотя его телескоп обладал увеличением всего в 30 раз и с нашей точки зрения давал весьма плохое качество изображения. Современные телескопы имеют огромные размеры и представляют собой весьма сложное сооружение.

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19

Lee, Aizeret, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Radioastronomical instrumentation : the diagonal horn." THESIS_CSTE_EID_Lee_A.xml, 2002. http://handle.uws.edu.au:8081/1959.7/699.

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The horn plays an elemental role in the make up of a radio-telescope. The focus of this research is on one particular type of horn – the diagonal horn. An analysis of the diagonal horn is made using the Fourier method. The analysis begins from Maxwell’s equations, as the basic building block, and describes the steps involved in developing the radiation pattern. Based on the theory, a program was written that produces the theoretical graphs referred to throughout the thesis. A diagonal horn was manufactured and the radiation patterns were measured. A comparison of these measured patterns is mad

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20

Rodríguez, Gonzálvez Carmen. "Analysis of cosmic microwave background observations with the Arcminute Microkelvin Imager." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609911.

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21

Liu, Kuo. "Exploring pulsar-black hole binaries using the next generation of radio telescopes." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/exploring-pulsarblack-hole-binaries-using-the-next-generation-of-radio-telescopes(90168fce-f8b9-4cea-a83d-773bf5368055).html.

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Binary pulsars are well known for their usefulness in testing gravitational theories. Pulsar-black hole (PSR-BH) binary systems, once discovered, will be the 'next generation of celestial laboratories' being able to both probe BH properties and test gravity especially General Relativity's cosmic censorship conjecture and no-hair theorem. The achievement of these prized goals requires highly precise pulsar timing observations, which are more readily achieved with the next generation of radio telescopes such as the Square Kilometre Array (SKA) and the Five-hundred-metre Aperture Spherical Radio

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22

Lee, Aizeret. "Radioastronomical instrumentation : the diagonal horn." Thesis, View thesis, 2002. http://handle.uws.edu.au:8081/1959.7/699.

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The horn plays an elemental role in the make up of a radio-telescope. The focus of this research is on one particular type of horn – the diagonal horn. An analysis of the diagonal horn is made using the Fourier method. The analysis begins from Maxwell’s equations, as the basic building block, and describes the steps involved in developing the radiation pattern. Based on the theory, a program was written that produces the theoretical graphs referred to throughout the thesis. A diagonal horn was manufactured and the radiation patterns were measured. A comparison of these measured patterns is mad

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23

Makhathini, Sphesihle. "Advanced radio interferometric simulation and data reduction techniques." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/57348.

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This work shows how legacy and novel radio Interferometry software packages and algorithms can be combined to produce high-quality reductions from modern telescopes, as well as end-to-end simulations for upcoming instruments such as the Square Kilometre Array (SKA) and its pathfinders. We first use a MeqTrees based simulations framework to quantify how artefacts due to direction-dependent effects accumulate with time, and the consequences of this accumulation when observing the same field multiple times in order to reach the survey depth. Our simulations suggest that a survey like LADUMA (Look

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24

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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25

Angioni, Roberto. "High-energy view of radio galaxies: prospects for the new generation of Cherenkov telescopes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8834/.

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I Nuclei Galattici Attivi (AGN) sono sorgenti luminose e compatte alimentate dall'accrescimento di materia sul buco nero supermassiccio al centro di una galassia. Una frazione di AGN, detta "radio-loud", emette fortemente nel radio grazie a getti relativistici accelerati dal buco nero. I Misaligned AGN (MAGN) sono sorgenti radio-loud il cui getto non è allineato con la nostra linea di vista (radiogalassie e SSRQ). La grande maggioranza delle sorgenti extragalattiche osservate in banda gamma sono blazar, mentre, in particolare in banda TeV, abbiamo solo 4 MAGN osservati. Lo scopo di questa tes

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26

Martinez, Jose Guadalupe [Verfasser]. "Pulsar Searching and Timing with the Arecibo and Effelsberg Radio Telescopes / Jose Guadalupe Martinez." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1194464866/34.

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27

Lee, Aizeret. "Radioastronomical instrumentation : the diagonal horn /." View thesis, 2002. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20031003.112749/index.html.

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Hungwe, Faith. "Variability analysis of a sample of potential southern calibration sources." Thesis, Rhodes University, 2009. http://hdl.handle.net/10962/d1005281.

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A considerable number of Very Long Baseline Interferometry (VLBI) surveys have been conducted in the northern hemisphere and very few in the southern hemisphere mostly because of a lack of telescopes and therefore adequate baseline coverage. Thus there is a deficit of calibrator sources in the southern hemisphere. Further, some of the most interesting astronomical objects eg. the galactic centre and the nearest galaxies (the small and large Magellanic Clouds) lie in the southern hemisphere and these require high resolution studies. With a major expansion of radio astronomy observing capability

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Black, Richard Allen. "Digital Back End Development and Interference Mitigation Methods for Radio Telescopes with Phased-Array Feeds." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4233.

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The Brigham Young University (BYU) Radio Astronomy group, in collaboration with Cornell University, the University of Massachusetts, and the National Radio Astronomy Observatory (NRAO), have in recent years developed and deployed PAF systems that demonstrated the advantages of PAFs for astronomy. However, these systems lacked the necessary bandwidth and acquisition times to be scientifically viable. This thesis outlines the development of a 20-MHz bandwidth system that can acquire for much longer periods of time and across much larger bandwidths than previous BYU systems. A report of the deplo

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Janse, van Vuuren Frank. "Design of a hexapod mount for a radio telescope." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6693.

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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The world's astronomy community is working together to build the largest and most sensitive radio telescope in the world namely: the SKA (Square Kilometre Array). It will consist of approximately three thousand dishes which will each require accurate positioning. The Square Kilometer Array has a testbed called the Phased Experimental Demonstrator (PED) in Observatory, Cape Town. A hexapod positioning mechanism is required to position a 3.7 m radio telescope which forms part of an ar

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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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McAlpine, Kim. "The SKA's the limit : on the nature of faint radio sources." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1007271.

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From abstract: Within the next few years a large number of new and vastly more sensitive radio astronomy facilities are scheduled to come online. These new facilities will map large areas of the sky to unprecedented depths and transform radio astronomy into the leading technique for investigating the complex processes which govern the formation and evolution of galaxies. This thesis combines multi-wavelength techniques, highly relevant to future deep radio surveys, to study the evolution and properties of faint radio sources.<br>TeX<br>Adobe Acrobat 9.54 Paper Capture Plug-in

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33

Caneva, Gessica De. "Studies of active galactic nuclei with the MAGIC telescopes." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17179.

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Schwerpunkt dieser Arbeit ist die Emission von hochenergetischer Gammastrahlung aus Aktiven Galaxienkernen, anhand von Beobachtungen mit den MAGIC Teleskopen. Aktive Galaxien entstehen durch die Freisetzung von Gravitationsenergie der Stellarmaterie, die in das zentrale Schwarze Loch fällt. Zwei diametral entgegengesetzte Jets strömen aus dem Kern. Falls einer von diesen Jets zum Beobachter zeigt, wird der aktive Galaxienkern als Blazar bezeichnet. In dieser Doktorarbeit wird die Analyse der MAGIC Beobachtungen von drei Blazaren präsentiert: der bisher unbekannte hochenergetische Blazar 1ES 1

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Lord, Christopher John. "A low frequency array of simple radio telescopes for the detection of solar x-ray and radio flares and the study of the Ionosphere." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/2102.

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The thesis: “A low frequency array of simple radio telescopes for the detection of solar X-ray and radio flares, and the study of the ionosphere”, describes the development of antennas, receivers and software for a radio telescope system that captures data from the 16 MHz to 30MHz radio spectrum to a personal computer. Three of these radio telescope systems were established at sites in Perth, Gingin and Learmonth, Western Australia.

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Tenenbaum, Emily Dale. "MILLIMETER WAVE STUDIES OF CIRCUMSTELLAR CHEMISTRY." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/194941.

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Millimeter wave studies of molecules in circumstellar envelopes and a planetary nebula have been conducted. Using the Submillimeter Telescope (SMT) of the Arizona Radio Observatory (ARO) on Mt. Graham, a comparative spectral survey from 215-285 GHz was carried out of the carbon-rich asymptotic giant branch star IRC +10216 and the oxygen-rich supergiant VY Canis Majoris. A total of 858 emission lines were observed in both objects, arising from 40 different molecules. In VY Canis Majoris, AlO, AlOH, and PO were detected for the first time in interstellar space. In IRC +10216, PH3 was detecte

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Ludovici, Dominic Alesio. "Radio wavelength studies of the Galactic Center source N3, spectroscopic instrumentation for robotic telescope systems, and developing active learning activities for astronomy laboratory courses." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5557.

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The mysterious radio source N3 appears to be located within the vicinity of the Radio Arc region of the Galactic Center. To investigate the nature of this source, we have conducted radio observations with the VLA and the VLBA. Continuum observations between 2 and 50 GHz reveal that N3 is an extremely compact and bright source with a non-thermal spectrum. Molecular line observations with the VLA reveal a compact molecular cloud adjacent to N3 in projection. The properties of this cloud are consistent with other galactic center clouds. We are able to rule out several hypotheses for the nature of

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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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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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Volkmann, Mark Hans. "A superconducting software defined radio frontend with application to the Square Kilometre Array." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85798.

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Thesis (PhD)-- Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: Superconducting electronics can make the Square Kilometre Array (SKA) a better instrument. The largest radio telescope in the world will consist of several arrays, the largest of which, consisting of more than 3000 dishes, will be situated primarily in South Africa. The ambitions of the SKA are grand and their realisation requires technology that does not exist today. Current plans see signals in the band of interest ampli ed, channelised, mixed down and then digitised. An all-digital frontend could simplify receiver str

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Baelemans, Rene Adrianus Cornelis. "Co-Design of Wideband Polarization-Agile Phased-Array Antennas and Low-Noise Amplifiers for the Next Generation Radio Telescopes." Thesis, Curtin University, 2022. http://hdl.handle.net/20.500.11937/89767.

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The next generation of radio-astronomy telescopes in the UHF or decimetre band require phased-array technologies which can provide a high sensitivity, large bandwidth, high polarization purity, and a large Field-of-View. To this end, this thesis will present and discuss the capacitively-connected dipole array including a novel small-scale intermediate experimental validation method and a comprehensive description of its performance as a radio-astronomy instrument.

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Jew, Luke. "Measurements of diffuse galactic emission at 5 GHz with C-BASS." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:31f0227a-84be-421a-ae46-eebe9f422767.

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The C-Band All-Sky Survey (C-BASS) is a project to produce an all-sky map in intensity and polarization at a central frequency of 5 GHz with 1 GHz bandwidth and approximately 1 degree resolution. The central frequency is low enough for the map to be dominated by synchrotron and free-free emission but high enough so that Faraday rotation and depolarization are small across most of the sky. The C-BASS map will enable a more accurate removal of contaminating foregrounds from measurements of the cosmic microwave background, particularly in polarization where the B-mode signal from inflation is lik

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42

Nigro, Cosimo. "Study of Persistent and Flaring Gamma-Ray Emission from Active Galactic Nuclei with the MAGIC Telescopes and Prospects for Future Open Data Formats in Gamma-Ray Astronomy." Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20582.

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Angetrieben durch die Akkretion von Materie in ein super massives Schwarzes Loch in ihrem Zentrum, stellen aktive Galaxien die stärksten und beständigsten Strahlungsquellen im Universum dar. Ihre elektromagnetische Emission kann sich bis in den Gammastrahlenbereich ausbreiten. Das Ziel dieser Arbeit ist, diese Mechanismen und die Orte jenseits der hoch energetischen Emission zu charakterisieren. Dafür werden die Observationen von zwei Aktiven Galaxien im Bereich von hunderten von GeV verwendet, welche mit den Cherenkov Teleskopen MAGIC aufgenommen wurden. Die physikalische Interpretation wird

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Botha, Antheun. "Development of a real-time transient analyser for the SKA." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86462.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: The extension of the Karoo Array Telescope (KAT), MeerKAT, will be the most sensitive radio telescope in the southern hemisphere until it is superseded by the completion of the Square Kilometre Array (SKA). These instruments are to be constructed in the Karoo which is an area in South-Africa that is protected against Radio Frequency Interference (RFI) by the Astronomy Geographical Advantage (AGA) act. However, the telescope is also vulnerable to self-generated interference and specialised measurement systems are required to mon

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Ranka, Trupti. "Disturbance Rejection Control for The Green Bank Telescope." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459556332.

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Matthysen, Nardus. "Time domain metrology for MeerKAT systems." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95963.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: This work in this study covers a powerful technique to derive propagation and scattering information in an expedient fashion. Expedient because time-domain (TD) data gathers a broad spectrum in a single transmitted pulse. TD has been criticised because of a lack of dynamic range, which has now been overcome by the direct sampling system, RATTY and RTA. This study focuses on the investigation of a TD metrology system, to assist with the characterisation of MeerKAT systems. The elementary components of the system include a f

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Mathys, Sebastian [Verfasser]. "Optimization of the AERA data at the Pierre Auger Observatory - Developing a new interface for data handling and improving the radio reconstruction based on data measured by fluorescence telescopes / Sebastian Mathys." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1186720883/34.

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Lindén, Henrik. "Ångström Small Radio Telescope." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-154732.

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For the Swedish Institute of Space Physics and Uppsala University, we have developed a working radio astronomy telescope capable of receiving the 21cm hydrogen line; the Ångström Small Radio Telescope. The work have resulted in a functional system for positioning the dish, with built in tracking of deep space objects and scanning functions, and signal reception with filtering, mixing and digital sampling. The system is controlled via a computer through an Internet connection.

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Feliachi, Rym. "Traitement spatial des interférences cyclostationnaires pour les radiotélescopes à réseau d'antennes phasé." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00578950.

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Cette thèse est une contribution à l'amélioration des observations pour les radiotélescopes à réseaux phasés en présence d'interférences. L'originalité de cette thèse repose sur l'utilisation de la séparation spatiale entre les sources cosmiques et les brouilleurs issus des télécommunications en se basant sur la cyclostationnarité de ces derniers. Cette thèse s'inscrit dans le cadre du projet européen SKADS pour l'amélioration des techniques de suppression d'interférences en radioastronomie pour les futurs instruments d'observations.Nous avons proposé trois techniques de traitement d'interfére

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CIORBA, LORENZO. "UAV-based Far-Field and Near-Field Antenna Measurements." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2972561.

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Zhang, Yan. "Patch Antenna for 1420MHz Radio Telescope." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1151.

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<p>Patch antenna is one of the most rapidly popular topics in the antenna field in the past twenty years. In high-performance aircraft, spacecraft, satellite and missile applications, where size, weight, cost, performance, ease of installation, and aerodynamic profile are constraints, low profile antennas may be required. [7].</p><p>The project is to develop a single patch antenna operating on a specific frequency 1420MHz. The frequencies near to 1420MHz are worth to observe because the hydrogen in throughout of the space can be mapped by the observation of the 21 – cm wavelength line which is

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