Summary

The statistical approach to the rail testing tasks is preserved. The rail testing signals are ob-tained using the magneto-dynamical selecting method on the Lviv railway track section (Ukraine). The stationary frequency ranges for signals from typical non-faulted and faulted rails are investigated. The frequency range corresponding to defects image display is established. The basis of periodically correlated random processes (PCRP) and the scope of tasks which appear in rail testing using the PCRP methods analysis are stated. The complex of defect rail signals non-stationary correlation analysis is carried out. The possibilities of using the PCRP methods for separating the defect useful signal and localizing the defects on the early stage of their growth are shown. Key words: rail testing, periodically correlated random processes, spectral density, variance ANALIZA STATYSTYCZNA SYGNAàÓW DEFEKTOSKOPII SZYN TORÓW KOLEJOWYCH Streszczenie W pracy podano podejĞcie statystyczne do problemu defektoskopii szyn torów kolejowych. Sygnaáy testowe otrzymane za pomocą metody magnetodynamicznej selekcji na odcinkach kolei Lwowskiej. Zbadano zakres czĊstotliwoĞci sygnaáów szyn z defektami i bez defektów w przybli