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 10 of 10 for “"clean algorithm"”.
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The Applicability of the Tap-Delay Line Channel Model to Ultra Wideband
… we examined a time domain technique known as the CLEAN algorithm for our channel modeling analysis. A detailed analysis of the CLEAN algorithm is given, as it is found that it is sufficient for our application. The impact of per-path pulse distortion due to various mechanisms on the tap-delay line …
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The development of new methods for high resolution radio astronomy imaging
… advantage in resolution it possesses over the CLEAN algorithm is discussed and demonstrated using Monte Carlo simulations. This new polarisation MEM code has been applied to multi-wavelength imaging of the Active Galactic Nuclei 0716+714, Mrk 501 and 1633+382, in each case providing improved …
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Ultra-Wideband for Communications: Spatial Characteristics and Interference Suppression
… obtained using a two-dimensional deconvolution algorithm called the Sensor-CLEAN algorithm. A spatial channel model that incorporates the spatial and temporal features of the channel is developed based on the AOA statistics. The performance of the Sensor-CLEAN algorithm is evaluated briefly by …
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Characterizing alma for solar observation
… and imaging, are given in Chapter 3. The CLEAN algorithm that is used for producing images is also discussed in this chapter. Examples of processed images, both for single dish and interferometer, are shown in Chapter 4. In the final Chapter 5, a discussion about what remains to be done to …
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Accelerated deconvolution of radio interferometric images using orthogonal matching pursuit and graphics hardware
… radio astronomers have mostly used the CLEAN algorithm, and variants thereof. However, the techniques of compressed sensing provide a mathematically rigorous framework within which deconvolution of radio interferometric images can be implemented. We present an accelerated implementation …
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Plasma line generation and spectral estimation from Arecibo Observatory radar data
… technology. In spectral analysis the “CLEAN” algorithm is used to deconvolve the measured ISR spectrograms from frequency/height mixing caused by the finite pulse length effect. CLEANed spectrograms are subsequently fitted to a Gaussian spectral model for each height to extract an …
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Ultra-wideband Small Scale Channel Modeling and its Application to Receiver Design
… are discussed. A detailed analysis of the CLEAN algorithm, which was used to process all the measurement data, is also given, and some limitations of the algorithm are presented. The significance of the channel impulse response model chosen for the simulation of UWB communications systems …
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Characterisation Of The Blazhko Effect In RR Lyrae Stars Using SuperWASP Data
… in frequency spectra created using the CLEAN algorithm. Analysis of pulsation and Blazhko attributes within this large sample shows no correlation between them. 140 Blazhko candidates were also identified by short-term periodic trends in their O-C diagrams. This phase domain analysis …
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Constrained Spectral Conditioning for the Spatial Mapping of Sound
… interfering noise is accounted for, existing algorithms which aim to both spatially isolate distinct sources and determine their individual levels as measured by the array are complex and require assumptions about the nature of the sound field. This work develops a processing scheme which uses …
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Channel Probing for an Indoor Wireless Communications Channel
The statistics of the amplitude, time and angle of arrival of multipaths in an indoor environment are all necessary components of multipath models used to simulate the performance of spatial diversity in receive antenna configurations. The model presented by Saleh and Valenzuela, was added to by …