Vehicle Geolocation Using Inductive Sensor Beacon Detection
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Solution Overview
Problem
Current vehicle positioning systems on rail networks face challenges such as accuracy limitations due to micro-slip, vulnerability to vandalism and mechanical stress of track markers, high maintenance costs, and disruptions from weather and malicious interference, particularly in areas without GPS coverage.
Innovation Solution
A geolocation system using inductive sensors to detect randomly distributed metallic or magnetic markers along the guideway, with a database recording the distribution of these markers, allowing for precise location determination through signal processing and consistency verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-based geolocation systems are used for vehicle positioning, then absolute positioning is achieved, but accuracy deteriorates in areas without radio frequency coverage such as tunnels, underpasses, deep valleys, or urban corridors
Solution Approach 1:
The patent introduces trackside beacons as intermediary devices that transmit location information to the vehicle. These beacons act as mediators between the vehicle's positioning system and the ground truth, enabling absolute positioning even when GPS signals are unavailable. The beacons are distributed along the track and provide continuous positioning references throughout the vehicle's journey.
Solution Approach 2:
The patent replaces the satellite-based radio frequency system (GPS) with a ground-based optical/mechanical system using trackside beacons. This substitution eliminates dependence on satellite signals and enables reliable positioning in GPS-denied areas by using locally deployed reference markers that the vehicle passes through.
2Measurement precision
If trackside beacons are installed for recalibration of odometry position, then positioning accuracy is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The patent extracts the positioning reference function from the complex odometry system and implements it through simple passive beacons. Instead of using complex active transmitters requiring power and communication systems, the solution uses simple passive reflective beacons that merely provide geometric reference points, significantly simplifying the overall system architecture.
Solution Approach 2:
The patent employs simple, inexpensive passive beacons that can be easily installed and replaced along the track. These beacons are designed to be low-cost components that provide sufficient positioning reference without requiring expensive active systems, enabling economical deployment across the entire rail network.
3Measurement precision
If magnetic markers are distributed along the track for speed and position measurement, then measurement precision is improved, but manufacturing precision requirements become extremely strict
Solution Approach 1:
The patent applies local quality by using beacons with distinct local characteristics (such as different colors, shapes, or patterns) that can be easily differentiated by the vehicle's sensors. This allows the system to identify each beacon's unique position without requiring extremely tight manufacturing tolerances across the entire track, as long as the local features remain distinguishable.
Solution Approach 2:
The patent utilizes optical characteristics (color, pattern, or visual features) of the beacons as identifying markers. By varying these visual properties along the track, the system creates unique signatures for each beacon position, enabling precise identification without relying on extremely precise dimensional tolerances in the magnetic or physical markers themselves.
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
This system provides robust, precise, and cost-effective vehicle positioning with reduced maintenance needs, resistant to environmental and malicious interference, and capable of operating in areas without GPS coverage.
Implementation Method 1
A geolocation system using inductive sensors to detect randomly distributed metallic or magnetic markers along the guideway
Data Source
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AI summary
The present invention relates to a method for locating and/or measuring the speed of a vehicle moving along a guide track, for example, a railway track consisting of two rails, and to a device equipping such a vehicle, in particular an autonomous shuttle. To improve the operating conditions of a fleet of shuttles, subway trains, a fleet of autonomous handling vehicles, or trains on a railway network, as well as the overall safety of traffic, it is necessary to know precisely the speed and location (position) of each vehicle on the guide track.