Using the wavelet decomposition method for monitoring of amplitude-manipulated signals of railway automation
Journal Title: Електромагнітна сумісність та безпека на залізничному транспорті - Year 2018, Vol 1, Issue 16
Abstract
In railway signaling systems, some parameters required for monitoring and controlling train movements are transmitted using amplitude shift keying (ASK) signals. ASK signals are more often used in railway automated systems due to their simpler generation by contact transmitters, but such signals have a low level of immunity and interference in them can lead to incorrect op-eration of railway signaling systems. The efficiency of using the signal decomposition method by wavelet transform to reveal distortions for continuous ASK railway signals have been investi-gated in the work. Simulated signals were generated as a pure ASK signals with a carrier frequency of 420 Hz and a modulation frequency of 8 Hz, as well as five variants of the original signal with disturb-ances in the form of signals with distorted signal shape, signals with swells, signals with sags, signals with 50 Hz interferences, and signals with sharp pulses . The signal segments of ten periods were decomposed using a five-level wavelet packet trans-form (WPT). For all investigated signals, the distortions or interferences in them lead, not only to changes in distribution of partial energies at the nodes, but also to the appearance of strong differences in the form of oscillations of the WPT coefficients. The variations in WPT coefficients in low-frequency nodes reflect changes in the waveform due to pulse distortion, sags, swells, etc. The obtained results confirm the efficiency of using the wavelet decomposition method in or-der to detect distortions in the ASK continuous railway signals.
Authors and Affiliations
V. I. Havryliuk
Keywords
Related Articles
- EP ID EP618536
- DOI 10.15802/ecsrt2018/172533
- Views 148
- Downloads 0
Problems of energy conservation and improvement of the methodology of calculating tariffs on electric energy
Purpose. The aim of the article is to construct the most rational schemes and algorithms for their application to determine economically sound transparent prices for electricity and other goods in a market economy based...
Microprocessor systems of electric interlocking with the application of optical fiber telecommunication cables on the Railways of Ukraine
The aim of paper is an analysis of the existing types of fiber-optical lines, an evaluation of the advantages and disadvantages arising at the maintenance of its and determination of the direction in the modernization of...
Diagnostics three-phase asynchronous motors
The purpose of the work is to improve the maintenance technique of power asynchronous motors with short-circuited rotor. Scientific novelty of the obtained results is improving the technique of automated diagnostics of p...
The results of experimental studies of the process of changing the technical condition of freight cars in operation
The paper presents the results of experimental studies in the transition to a system of mainte-nance and repair on a technical condition with the use of visual-optical control of the boundary states of the units of freig...
Comparative analysis of experimental and calculation methods for determination of the traction current harmonics distribution in rails
The purpose of this work is to perform the comparative analysis of experimental and calcula-tion methods for determination of the distribution of traction current harmonics in rails. To in-vestigate the distribution of t...