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 12 of 12 for “"RFI mitigation"”.
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Genetic programming applied to RFI mitigation in radio astronomy
… as signal or radio frequency interference (RFI) generated by instruments and machinery which makes challenging astronomers' ability to discern the desired targets. The training data was derived from the output of an observation run of the KAT-7 radio telescope array built by the South …
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Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy
… radio astronomy radio frequency interference (RFI) mitigation regime constitutes the main contribution of this thesis. The real-time BYU test platform consists of small radio telescopes, low noise RF receivers, and a state-of-the-art DSP platform. This programmable real-time radio astronomy RFI …
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High-Speed Data Acquisition and FPGA Detected Pulse Blanking System for Interference Mitigation in Radio Astronomy
… are called radio frequency interference (RFI). One strategy to remove RFI is to apply spatial filtering using an array antenna. This thesis documents the development of a high-speed data acquisition system used to record data from 7- and 19-element phased array feeds. The system supports …
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The Development of a Small Scale Radio Astronomy Image Synthesis Array for Research in Radio Frequency Interference Mitigation
… susceptible to radio frequency interference (RFI) from man made sources such as orbiting satellites. The radio astronomy research group at Brigham Young University (BYU) is investigating methods to mitigate the effects of RFI in radio astronomy synthesis imaging. Though real-time RFI …
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Beamforming Techniques and Interference Mitigation Using a Multiple Feed Array for Radio Astronomy
… waveguide feed. Simulations were ran using RFI mitigation algorithms on the array to show that interference cancellation can, in principle, be performed using a phased array feed. In addition to these simulations, improvements were made to a previously designed RF receiver so that radio …
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Mitigation of Interference From Iridium Satellites by Parametric Estimation and Subtraction
… to mitigate the radio frequency interference (RFI) from the Iridium satellite system. A technique is presented here to detect the downlink signal of Iridium, estimate the parameters of the signal, synthesize the noise-free version of the signal and finally subtract the recreated signal from the …
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Courting Serendipity: The Search for Transient Radio Signals
… terrestrial radio frequency interference (RFI) and limited computing power. Today, a confluence of new RFI mitigation techniques and computing power makes a thorough census of the radio sky a realistic goal. A complete transient survey could uncover, in addition to entirely new classes of …
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A Dedicated Search for Low Frequency Radio Transient Astrophysical Events using ETA
… calibration, radio frequency interference (RFI) mitigation, and incoherent dedispersion. A dispersed pulse simulation code was developed and used to test the toolchain. Finally, improvements are suggested.
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Coherent Mitigation of Radio Frequency Interference in 10-100 MHz
… of mitigating radio frequency interference (RFI) in the frequency range 10-100 MHz, developing and evaluating coherent methods with which RFI is subtracted from the afflicted data, nominally resulting in no distortion of the underlying signals. This approach is of interest in weak signal …
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Efficient estimation and mitigation for radio-frequency interference
… possibly introduce radio frequency interference (RFI) issues. In this dissertation, a transfer function based calculation method is proposed to estimate radio frequency interference (RFI) problems. The derived equations can clearly decompose the RFI problem into two parts: the noise source and the …
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Digital Signal Processing for the Canadian Hydrogen Intensity Mapping Experiment
… of transient Radio-Frequency Interference (RFI). A number of RFI mitigation techniques were examined, including Median Absolute Deviation and Spectral Kurtosis measures; the latter was implemented on CHIME and the Pathfinder, and results from tests of the RFI detection system are presented. …
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A Prototype Platform for Array Feed Development
Radio frequency interference (RFI) is a growing problem for radio astronomers. One potential solution utilizes spatial filtering by placing an array of electrically small antennas at the focal plane of a parabolic reflector. This thesis documents the design and characterization of a prototype array …