Stop Announcement System Using Platform Beacons for Tunnel Positioning
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Solution Overview
Problem
Current stop announcement systems for underground and undersea tunnels are inefficient due to reliance on inaccurate GPS, leading to significant time differences in passengers' ability to determine station arrival, causing inconvenience and safety issues.
Innovation Solution
A stop announcement system comprising platform beacons at stop sites and stop announcement devices on transportation means, which communicate via short-range signals to provide timely and accurate announcements of entering, stopping, and leaving the station, ensuring all passengers receive synchronized information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS is used to determine train position and stop arrival, then the system can provide location information, but the measurement precision is insufficient due to GPS error (four root mean squares)
Solution Approach 1:
The patent introduces platform beacons as intermediary objects that emit signals detectable by the train's detection device. This intermediary system enables precise position measurement by detecting signal strength variations from known beacon locations, overcoming GPS inaccuracies in tunnel environments where satellite signals are unavailable.
Solution Approach 2:
The patent replaces the GPS satellite-based electromagnetic positioning system with a ground-based beacon signal detection system. This substitution provides more reliable and precise position measurement by using local infrastructure (platform beacons) rather than relying on satellite signals that penetrate poorly through tunnel structures.
2Adaptability or versatility
If the train runs in a tunnel, then the transportation means can operate underground, but the passengers cannot determine station arrival visually and receive stop announcement information at different times
Solution Approach 1:
The system continuously detects the train's position by monitoring beacon signal strength and provides real-time feedback through synchronized stop announcements. The detection device measures signal parameters, determines position based on these measurements, and triggers announcements at precisely calculated moments, ensuring all passengers receive information simultaneously regardless of their location in the train.
Solution Approach 2:
The system performs preliminary position detection and calculation before the train actually arrives at the station. By continuously monitoring beacon signals and predicting arrival time based on current position and train speed, the system prepares and synchronizes stop announcement timing in advance, eliminating the time delay experienced by passengers in different carriages.
3Ease of operation
If detection devices on different carriages detect stop information independently, then each carriage can determine its own position, but there is a significant time difference in receiving stop announcement information
Solution Approach 1:
The patent merges the independent detection capabilities of multiple carriages into a unified stop announcement system. While each carriage's detection device independently monitors beacon signals, the central control unit collects data from all carriages, calculates the train's overall position and speed, and determines a single synchronized stop announcement time that accounts for the spatial distribution of all carriages relative to the platform.
Data Source
AI summary
The present invention is adapted to the technical field of communication, and provides a stop announcement system and a method thereof. The stop announcement system comprises: at least one platform beacon disposed on at least one stop site of a transportation means for identifying a position message of the stop site, and sending a message of position change according to the position change of the transportation means relative to the stop site; and at least one stop announcement device disposed on the transportation means for receiving the message of position change and sending a corresponding stop announcement message when the transportation means moves into a range of a preset communication distance of the at least one platform beacon; wherein the stop announcement message at least comprises a prompt message of entering into the stop site and/or a prompt message of stopping on the stop site and/or a prompt message of leaving the stop site. By virtue of this, the present invention achieves timely and accurately stop announcement in operation of the transportation means.