Self-contained Inertial Train Navigation System
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Solution Overview
Problem
Current Positive Train Control (PTC) systems are costly and vulnerable to malicious interference, such as GPS signal spoofing or jamming, which compromises their ability to prevent train derailments by accurately determining a train's location and velocity on fixed tracks.
Innovation Solution
A trusted accident avoidance control system that uses self-contained inertial sensors and aiding components to estimate a train's position and velocity, relying on pre-surveyed data stored on-board, eliminating the need for external communication and reducing infrastructure costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS-based navigation systems are used for train control, then location determination capability is improved, but vulnerability to malicious interference increases
Solution Approach 1:
The patent introduces an inertial measurement unit (IMU) as an intermediary system that provides location determination capability independent of external GPS signals. The IMU uses onboard sensors to measure acceleration and integrate this data to calculate position, velocity, and orientation without relying on external infrastructure, thereby eliminating vulnerability to GPS spoofing or jamming while maintaining measurement precision.
Solution Approach 2:
The system employs self-contained inertial sensors and onboard pre-surveyed data storage to determine train location and velocity without external assistance. The train carries its own navigation capabilities through the IMU and stored geographic information, making the system autonomous and resistant to external interference while maintaining accurate location determination.
2Reliability
If satellite-based GPS infrastructure is deployed for Positive Train Control, then accident avoidance capability is improved, but infrastructure cost increases
Solution Approach 1:
The patent implements a self-contained navigation system where each train carries its own inertial measurement unit and onboard database of pre-surveyed geographic information. This eliminates the need for expensive satellite infrastructure deployment along railway tracks, as the train independently determines its own location, velocity, and position using only onboard resources.
Solution Approach 2:
The patent extracts the navigation functionality from external GPS infrastructure and relocates it onto the train itself through the IMU system. By taking out the dependency on external satellite systems and replacing it with onboard inertial sensors and stored geographic data, the system eliminates infrastructure costs while maintaining accident avoidance capability.
3Measurement precision
If multiple sensor systems are integrated for location determination, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent merges the inertial measurement unit with pre-surveyed geographic information stored onboard the train to create an integrated navigation system. The IMU provides continuous position, velocity, and orientation data that is correlated with stored geographic features, combining sensor data with database information to achieve high measurement accuracy without requiring multiple separate systems.
Solution Approach 2:
The inertial measurement unit serves multiple functions simultaneously: determining location, calculating velocity, measuring acceleration, and tracking orientation. By making the IMU a multi-functional component that handles various navigation tasks, the system achieves high measurement precision across multiple parameters without proportionally increasing system complexity.
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 a reliable and secure method to prevent train derailments by accurately determining a train's location and velocity, reducing the risk of accidents and infrastructure costs, while being resistant to external interference.
Implementation Method 1
an inertial measurement unit operable to generate an initial estimated current location of the train on the fixed track
Data Source
AI summary
A trusted accident avoidance control system supported on a vehicle operable to travel a path, and comprising at least first and second location determination components operable to estimate a current position of the vehicle. An error correction component can receive the estimated current position information from the first and second location determination components and determine an updated estimated current position of the vehicle based on these, wherein the error correction component can be operable with a path database to identify a predetermined threshold velocity for the updated estimated current position of the vehicle. A velocity management component can determine, based on the updated estimated current position, whether a current velocity of the vehicle exceeds the predetermined threshold velocity, and if so, initiate an accident avoidance measure. The trusted accident avoidance control system is self-contained to the vehicle, not relying on outside sources to generate any estimated current positions.