Підвищення ємності та завадостійкості каналу передачі даних в системі автоматичної локомотивної сигналізації

K. V. Honcharov; R. V. Rybalka; V. V. Malovichko

doi:10.15802/stp2025/338389

Authors

K. V. Honcharov Ukrainian State University of Science and Technologies, SEI DIIT, Ukraine https://orcid.org/0000-0002-0432-1077
R. V. Rybalka Ukrainian State University of Science and Technologies, SEI DIIT, Ukraine https://orcid.org/0000-0001-7444-0517
V. V. Malovichko Ukrainian State University of Science and Technologies, SEI DIIT, Ukraine https://orcid.org/0009-0008-2704-5555

DOI:

https://doi.org/10.15802/stp2025/338389

Keywords:

automatic locomotive signaling, rail line, transmission channel capacity, source entropy, noise-resistant coding, Faira code, four-position phase manipulation, simulation modeling

Abstract

Purpose. Improvement of the automatic cab signaling (ACS) system by increasing the capacity and interference immunity of the data transmission channel based on the rail line. Methodology. To achieve the purpose, the analysis of existing solutions for improving the automatic cab signaling system has been performed. The comparative assessment of capacity the data transmission channel in the automatic cab signaling system ALSN with numerical coding and the potential capacity of the channel based on the rail line has been carried out. The system of commands of the multi-valued ACS has been proposed, that in addition to traditional ALSN commands, allows transmitting to the locomotive information about speed limits at stations, permanent restrictions according to the characteristics of railway sections, as well as information about the current train situation on the section, taking into account the possible increase in speeds to 250 km/h. To increase the interference immunity of the data transmission channel, it was proposed to use Fire code and quadrature phase shift keying QPSK. The generator polynomial of the Fire code has been determined, the information rate and transmission time of one command have been calculated. Findings. To study the interference immunity of proposed system, the simulation model has been developed, the program code of which is written in Python. It was determined that the Fire code (12,6) is guaranteed to detect all errors except for quadruple, sixfold and eightfold. To eliminate such errors, it is proposed to perform multiple receiving of each command. According to the simulation results, the total non-detection coefficient for single reception is 0.0087, for double reception is 1.6·10^-5. In the case of triple reception, no errors were detected during the simulation. Originality. The authors of this work proposed a set of solutions for improving the continuous system of automatic cab signaling: increasing the source entropy; reducing information losses by using the error-correcting Fire code and quadrature phase shift keying; increasing the frequency of message transmission and multiple receiving. Practical value. The implementation of the proposed solutions will allow increasing the capacity and interference immunity of the data transmission channel based on the rail line, expanding the ACS command system taking into account speed limits at stations, information about the set speed for high-speed railway lines, as well as permanent restrictions in accordance with the characteristics of railway sections.

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