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dc.contributor.authorMihalik, Andrew
dc.date.accessioned2007-09-09T06:35:02Z
dc.date.available2007-09-09T06:35:02Z
dc.date.issued2007-09-09T06:35:02Z
dc.date.submittedJuly 2007
dc.identifier.urihttp://hdl.handle.net/1928/3286
dc.description.abstractAny signal a satellite receives from Earth has traveled through the ionosphere. Transmission through the ionosphere results in a frequency dependent time-delay of the signal frequency components. This effect of the medium on the signal is termed dispersion, and it increases the difficulty of pulse detection. A system capable of compensating for the dispersion would be desirable, as pulsed signals would be more readily detected after compression. In this thesis, we investigate the derivation of a digital filter to compensate for the dispersion caused by the ionosphere. A transfer function model for the analysis of the ionosphere as a system is introduced. Based on the signal model, a matched filter response is derived. The problem is formulated as a group delay compensation effort. The Abel-Smith algorithm is employed for the synthesis of a cascaded allpass filter bank with desired group delay characteristics. Extending this work, an optimized allpass filter is then derived using a pole location approach. A mean-square error metric shows that the optimized filter can reproduce, and even improve upon, the results of the Abel-Smith design with a significantly lower order filter. When compared against digital filters produced with the least p-th minimax algorithm, we find that the new method exhibits significantly lower error in the band of interest, as well as lower mean squared error overall. The result is a simple optimized equalization filter that is stable, robust against cascading difficulties, and applicable to arbitrary waveforms. This filter is the cornerstone to a new all-digital electromagnetic pulse detection system.en_US
dc.format.extent1141824 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.subjectOptimalen_US
dc.subjectEqualizationen_US
dc.subjectDispersionen_US
dc.subjectDigitalen_US
dc.subjectIonosphereen_US
dc.subjectFilteren_US
dc.subjectOptimizationen_US
dc.subjectDisperseden_US
dc.subjectTrust Regionen_US
dc.subjectSatelliteen_US
dc.subjectrefractionen_US
dc.subjectallpassen_US
dc.subjectbiquaden_US
dc.subjectbi-quaden_US
dc.subjectdispersiveen_US
dc.subjectgroup delayen_US
dc.subjectpoleen_US
dc.subjectzeroen_US
dc.subjectpulseen_US
dc.subjectfrequencyen_US
dc.subjectcascadeen_US
dc.subjectmatcheden_US
dc.subject.lcshSignal processing
dc.titleOptimal digital filter design for dispersed signal equalizationen_US
dc.typeThesisen_US
dc.description.degreeMaster of Science Electrical Engineeringen
dc.description.levelMastersen
dc.description.departmentUniversity of New Mexico. Dept. of Electrical and Computer Engineeringen
dc.description.advisorPattichis, Marios
dc.description.committee-memberDoerry, Armin
dc.description.committee-memberChristodoulou, Christos
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