ΒΕΛΤΙΣΤΟΙ ΑΛΓΟΡΙΘΜΟΙ ΚΑΤΕΡΓΑΣΙΑΣ ΓΕΩΦΥΣΙΚΩΝ ΔΕΔΟΜΕΝΩΝ

THIS THESIS DEALS WITH GEOPHYSICAL SIGNAL PROCESSING: SPECIFICALLY IT DEALS WITH THE DECONDUCTION PROBLEM. IN THE FIRST PART, STATE SPACE MODELS ARE STUDIEDAND A GENERALIZED OPTIMAL DECONVOLUTION ALGORITHM IS COMPARED WITH REGARDS TOBOTH PERFORMANCE AND COMPUTATIONAL COMPLEXITY TO EXISTING DECONVOLUTION ALGORITHMS. THE RESULTS OF THIS COMPARISON SHOWED THAT THE NEW ALGORITHM BOTH PERFORMS BETTER AND IS COMPUTATIONALLY MORE EFFICIENT THAN EXISTING ONES, WHEN THE NUMBER OF SENSORS IS GREATER THAN ONE. THE ADAPTIVE LAINIOTIS FILTER IS APPLIED TO THE DECONVOLUTION PROBLEM WHEN THE MODEL IS NOT COMPLETELY KNOWN AND THECOMPUTATIONAL REQUIREMENTS OF ITS VARIOUS FORMS ARE ESTABLISHED. THE PERFORMANCE STUDY OF THE ADAPTIVE ALGORITHMS, TOGETHER WITH THE RESULTS OF THE STUDY OF THE ROBUSTNESS PROPERTIES OF THE CONVENTIONAL ALGORITHMS LEADS TO THE CONCLUSION THAT THE COMPUTATIONAL COST OF THE ADAPTIVE SCHEMES IS COMPLETELY COMPENSATED BY THEIR PERFORMANCE. THIS IS ESPECIALLY TRUE WHEN THERE EXISTS A PARALLEL IMPLEMENTATION FACILITY. IN THE SECOND PART, THE SYSTEM IS CONSIDERED TO BEDESCRIBED BY AN INPUT-OUTPUT EQUATION AND THE PREDICTIVE DECONVOLUTION METHODIS TAKEN UP. STATE-SPACE TECHNIQUES ARE USED TO ESTIMATE THE OPTIMAL PREDICTOR COEFFICIENTS IN THE CASE OF KNOWN SYSTEM ORDER, WHEREAS THE ADAPTIVE LAINIOTIS FILTER IS USED TO SOLVE THE PROBLEM OF SIMULTANEOUS MODEL ORDER ESTIMATION AND DECONVOLUTION. THE COMPUTATIONAL REQUIREMENTS OF THE RESULTING ALGORITHMSARE ESTABLISHED. ONCE AGAIN, RESULTS JUSTIFY THE USE OF AN ADAPTIVE SCHEME OVER A NON-ADAPTIVE ONE. A GENERALIZED ALGORITHM FOR THE ESTIMATION OF THE OPTIMAL PREDICTOR COEFFICIENTS IS ALSO DESIGNED, FOR THE CASE OF MIMO SYSTEMS. THISALGORITHM'S COMPUTATIONAL EFFICIENCY IS DISCUSSED.

Grantor dc:publisher

University of Patras

Year dc:date

1987

Authors dc:creator

• Katsikas, Socrates
• Κάτσικας, Σωκράτης

• ΑΠΟΔΟΣΗ ΑΛΓΟΡΙΘΜΩΝ
• ΑΠΟΣΩΕΛΙΞΗ
• ΑΥΤΟΠΡΟΣΑΡΜΟΖΟΜΕΝΟΙ ΑΛΓΟΡΙΘΜΟΙ
• ΓΕΩΦΥΣΙΚΑ ΣΗΜΑΤΑ
• Εκτίμηση
• Λείανση
• ΠΑΡΑΛΛΗΛΙΣΜΟΣ
• Πληροφορική
• ΣΕΙΣΜΙΚΗ ΜΕΘΟΔΟΣ
• ΦΙΛΤΡΑ ΔΙΑΜΕΛΙΣΜΟΥ ΛΑΙΝΙΩΤΗ
• Adaptive algorithms
• ALGORITHM EFFICIENCY
• Deconvolution
• Estimation
• GEOPHYSICAL SIGNALS
• LAINIOTIS PARTITIONING FILTERS
• PARALLELISM
• SEISMIC METHOD
• Smoothing
• Φυσικές Επιστήμες
• Επιστήμη Ηλεκτρονικών Υπολογιστών και Πληροφορική
• Επιστήμες Μηχανικού και Τεχνολογία
• Επιστήμη Ηλεκτρολόγου Μηχανικού, Ηλεκτρονικού Μηχανικού, Μηχανικού Η/Υ
• Natural Sciences
• Computer and Information Sciences
• Engineering and Technology
• Electrical Engineering, Electronic Engineering, Information Engineering

Language dc:language

gre

Identifier

10.12681/eadd/0119

OAI identifier oai:identifier

oai:10442/0119