Wireless Radar Level Crossing Train Detection
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Solution Overview
Problem
Existing level crossing systems rely on track circuits that require constant maintenance and wired connections, which are prone to damage and restrict train movements, and fail to provide reliable SIL-4 train detection without physical attachments to the rails.
Innovation Solution
A system using radar transceivers and reflective targets to detect train presence without rail attachments, enabling wireless activation and maintenance-free operation while maintaining safety integrity by calculating parameters like distance and angle to trigger level crossing barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track circuits are used to detect train presence and control level crossing barriers, then reliable train detection can be achieved, but constant maintenance and adjustment are required due to wired connections being damaged by track maintenance equipment
Solution Approach 1:
The patent extracts the train detection function from the wired track circuit system and relocates it to wireless radar transceivers positioned on the level crossing infrastructure. This removes the vulnerable wired connections from the detection system while maintaining reliable train presence detection through radar technology.
Solution Approach 2:
The patent replaces the mechanical/electrical track circuit system with a radar-based electromagnetic detection system. The wired electrical connections are substituted with wireless radar signals, eliminating the need for physical wire connections that are susceptible to damage from track maintenance equipment.
2Reliability
If wired track circuits are installed to provide train detection, then safe operation of level crossing barriers can be ensured, but train movements are restricted until wires are repaired when damaged
Solution Approach 1:
The patent removes the vulnerable wired connections from the train detection system and extracts the detection function to wireless radar transceivers. This eliminates the cause of train movement restrictions while maintaining safety through continuous radar-based train presence detection.
Solution Approach 2:
The patent introduces radar transceivers and reflective targets as intermediary components that enable train detection without direct wire connections to the rails. These intermediaries provide a reliable detection mechanism that does not interfere with track maintenance operations or restrict train movements.
3Ease of operation
If track circuits are used for level crossing activation, then barrier control can be achieved, but numerous train delays occur due to poor operation in harsh environmental conditions or damaged track wires
Solution Approach 1:
The patent replaces the electrical track circuit system with a radar-based detection system that uses electromagnetic waves instead of electrical currents through wires. This substitution eliminates the reliability issues associated with wired connections in harsh environmental conditions while maintaining barrier control functionality.
Solution Approach 2:
The radar transceivers and reflective targets form a self-contained detection system that does not require external wire connections or manual adjustment. The system automatically detects train presence and controls barriers without human intervention, improving operational consistency regardless of environmental conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable and safe wireless control of level crossings, reducing maintenance needs and ensuring continuous operation without rail wires, thus enhancing safety and operational efficiency.
Implementation Method 1
A system using radar transceivers and reflective targets to detect train presence without rail attachments
Data Source
AI summary
Controlling a level crossing includes one or more transceivers located in proximity of a level crossing area on a first side of a railway track; corresponding passive reflective targets located in proximity of the level crossing area on a second side of the railway track opposite to the first side where each transceiver is located and a control unit connected to each transceiver. Each target is arranged to receive RF signals coming from each transceiver and to send back corresponding reflected signals. Each transceiver is arranged to elaborate said reflected signals to calculate predetermined parameters values. Also, the control unit is arranged to acquire said parameters values from each transceiver and to elaborate them to detect the presence of a train in an area around the level crossing area and, in case of presence of said train, to send a warning message and/or close bars of the level crossing.