MICROELECTRONIC AND MICROPROCESSOR-BASED AUTOMATIC BLOCK SIGNALING SYSTEMS: ARCHITECTURE, FUNCTIONAL ANALYSIS, AND DIGITALIZATION PROSPECTS

Abstract

. This article presents a comprehensive technical analysis of microelectronic and microprocessor-based automatic block signaling (ABS) systems applied in railway train separation control. Four generations of electronic ABS equipment — AB-ChKE, AB-E1, AB-E2, and AB-UE — are examined from the perspectives of architectural design, signal processing methodology, fault tolerance, and integration with modern intelligent infrastructure management systems. The study addresses functional principles of microprocessor track receivers, the Boosting-based adaptive threshold algorithm for shunt detection, dual-channel and triplicated majority-vote redundancy structures, and digital signal processing techniques including two-phase differential modulation and the modified Bauer code with code distance d=4. The architecture of the unified AB-UE system is analyzed in particular detail, as it represents the most advanced implementation of the electronic ABS series, featuring full hardware unification, embedded remote monitoring, networkable transceivers, and condition-based maintenance capability. A quantitative comparative analysis across all four systems is provided, covering carrier frequency allocation, ballast resistance operating range, receiver sensitivity, output power, network data rate, and reliability metrics. The integration of ABS systems with SCADA platforms, PLC controllers, and IoT-based monitoring is assessed, and the transition pathway toward Industry 4.0-compliant predictive maintenance is evaluated. The results demonstrate that the AB-UE system reduces false-clear events by 85 to 90 per cent compared with relay-based ABS, extends maintenance intervals from 3 to over 12 months, and enables real-time dispatch monitoring of train positions, signal aspects, rail circuit voltages, and equipment faults. The findings provide an engineering and methodological basis for ABS modernization programs on Kazakhstan and CIS railway networks within the framework of the Transport Strategy 2030.