Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 75 for “"Radio Telescope"”.
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RFI monitoring for the MeerKAT Radio Telescope
… Africa is currently building MeerKAT, a 64 dish radio telescope array, as a pre-cursor for the proposed Square Kilometre Array (SKA). Both telescopes will be located at a remote site in the Karoo with a low level of Radio Frequency Interference (RFI). It is important to maintain a low level of …
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Stratospheric scattering of radio waves and the Jicamarca radio telescope
… and mechanisms of stratospheric scattering of radio waves is discussed. The equipment and procedures used in previous experiments at the Jicamarca Radio Observatory are examined in detail, and are found to require modification in some cases. The theory of phased arrays is presented, and the …
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Cosmic rays at LOFAR: precision measurements with a radio telescope
Contains fulltext : 207473.pdf (Publisher’s version ) (Open Access)
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A GPU based X-Engine for the MeerKAT Radio Telescope
… key component of the digital backend of a modern radio telescope array. The 64 antenna MeerKAT telescope has an FX architecture correlator consisting of 64 F-Engines and 256 X-Engines. These F- and X-Engines are all hosted on 128 custom designed FPGA processing boards. This custom board is known …
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Multiobjective optimization of a radio telescope array with site constraints
The next generation of radio telescope interferometric arrays requires careful design of the array configuration to optimize the performance and minimize the cost of the overall system while adhering to site constraints. A framework, based on genetic algorithms, for rapid exploration and …
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A UHF Multimode Array Feed for the Westford Radio Telescope
… Feed (MMAF) has been created for MIT’s Westford Radio Telescope. The MMAF is a dual-linear focal plane array installed concentrically with the existing QRFH feed on the telescope, enabling a combined system capable of transmit or receive on UHF radar and satcom frequencies simultaneous with …
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Low cost analog signal processing for massive radio telescope arrays
… frequency band. The Omniscope is a new type of radio telescope array being developed at MIT which images the entire sky in this band at low resolution using spatial Fourier transforms. In order to gain the maximum benefit from this type of telescope, a regular array of more than 10,000 antennas …
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A study of potential calibrators using the KAT-7 radio telescope
… calibrators observed by the Karoo Array Telescope (KAT-7). The KAT-7 is an engineering prototype for the coming sensitive array, the MeerKAT, one of the pathfinders for the Square Kilometre Array (SKA). This thesis plays a supporting role in the ongoing commissioning activities of the …
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Digital signal processing hardware for a fast fourier transform radio telescope
… in 21-cm tomography is such that a new kind of radio telescope is needed: one that scales well into very large numbers of antennas. The Omniscope, a Fast Fourier Transform telescope, is exactly such a telescope. I detail the implementation of the digital signal processing backend of a 32-channel …
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A scalable database model of RFI data for the MeerKAT/SKA radio telescope
In radio astronomy, radio frequency interference (RFI) refers to any signal captured by a radio telescope that did not originate from the observed target in the sky. RFI from terrestrial and other sources is a recognized problem that contaminates the desired signal and must be tracked and …
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Development of a feedback controller for the Antenna Positioner on the MeerKAT Radio Telescope
MeerKAT is South Africa's cutting edge radio telescope, designed, deployed and now operated by the South African Radio Astronomy Observatory (SARAO). The telescope consists of an array of 64 individual 13.5 m diameter fully steerable antennas. This project presents a comprehensive approach to the …
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Stream Communication and Computation in the Eight-meter-wavelength Transient Array (ETA) Radio Telescope
… is a unique implementation of an array-based radio telescope. The instrument is designed to further astronomy by detecting and characterizing dispersed pulses received between 29–47 MHz. To aid data processing of radio signals received through 24 antennas, the ETA system performs real-time …
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Design and Analysis of a Real-time Data Monitoring Prototype for the LWA Radio Telescope
… monitoring algorithms. The Long Wavelength Array telescope (LWA) is an astronomical apparatus that works with high speed data streams, and the proposed data-centric platform is developed to evaluate FPGAs to implement data monitoring algorithms in LWA. The throughput of the data-centric system has …
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Investigation into a GPS time pulse radiator for testing time-stamp accuracy of a radio telescope
The MeerKAT radio telescope in South Africa is required to tag the arrival time of a signal to within 10 ns of Coordinated Universal Time (UTC). The telescope has a local atomic clock ensemble and uses satellite based remote clock comparison techniques to compare the telescope time to UTC. The …
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A Completely Integrated Warm-IF Receiver and a 10GS/s Analog-Delay Pipeline ADC for Radio-Telescope Applications
The Cerro Chajnantor Atacama Telescope (CCAT) Heterodyne Array Instrument (CHAI) radio-telescope is a large international effort involving University of Calgary, Kölner Observatorium für Sub-Millimeter Astronomie (KOSMA), University of Bonn, McGill University, and many others. The goal of the CHAI …
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Development and Evaluation of the Ethernet Interface(s) for the Monitoring and Control System of a New Beamforming Radio Telescope
… Wavelength Array (LWA) is a large multi-purpose radio telescope, operating in frequencies between 10 and 88 MHz, designed for both long-wavelength astrophysics and ionospheric science. The LWA will eventually consist of 53 "stations", each consisting of 256 pairs of crossed-dipole antennas whose …
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Thermal design and analysis of the SKA SA MeerKAT Digitiser
… venture attempting to build the world's largest radio telescope. Australia and South Africa (together with other African countries), will be host to the SKA site. Both countries are building pre-cursor radio telescopes to demonstrate their ability to successfully host the project. Square …
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Software defined networking for radio telescopes: a case study on the applicability of SDN for MeerKAT
Scientific instruments like radio telescopes depend on high-performance networks for internal data exchange. The high bandwidth data exchange between the components of a radio telescope makes use of multicast networking. Complex multicast networks are hard to maintain and grow, and specific …
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X-band digitization systems aspects and filters for MeerKAT radio astronomy receiver
The MeerKAT Radio Telescope is a 64 element antenna array under construction in South Africa. This array will be used to observe radiation from celestial sources at radio frequencies. Once completed, this radio telescope will be the largest and most sensitive radio telescope in the Southern …
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Adventures in radio astronomy instrumentation and signal 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 …
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