Train Positioning via Dynamic GPS and Route Map Matching
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Solution Overview
Problem
Existing positioning apparatuses face challenges in accurately determining the migration path of an electric train while minimizing power consumption, as they struggle to differentiate between movement by an electric train and other modes of transport with high accuracy.
Innovation Solution
A portable positioning apparatus that integrates a CPU for integrated control, a GPS reception antenna, three-axis terrestrial magnetism and acceleration sensors, and a route map data storage section, which judges the moving state by analyzing sensor data and uses route map data to determine the migration path, reducing the frequency of GPS position measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS position measurement frequency is increased to improve migration path determination accuracy, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts GPS measurement frequency based on detected movement state. When electric train movement is detected through acceleration sensor analysis, GPS measurement frequency is reduced while maintaining accurate migration path determination by combining limited GPS points with route map data matching.
Solution Approach 2:
The system changes the parameter of GPS measurement frequency based on movement state detection. By analyzing acceleration sensor data to identify electric train characteristics, the system adjusts GPS sampling rate to match the specific transportation mode, reducing power consumption while maintaining positioning accuracy.
2Use of energy by moving object
If autonomous navigation is used to reduce power consumption, then power consumption is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The system merges GPS positioning with autonomous navigation by combining limited GPS measurement points with autonomous navigation calculations based on acceleration sensor data. This hybrid approach leverages the accuracy of GPS when available and the power efficiency of autonomous navigation, achieving both goals simultaneously.
Solution Approach 2:
Route map data serves as an intermediary that bridges GPS and autonomous navigation. The system matches calculated position with route map data to determine migration path, allowing accurate path determination even when GPS measurement frequency is reduced, thus enabling power savings without sacrificing accuracy.
3Use of energy by moving object
If sensor-based movement detection is used to reduce GPS frequency, then power consumption is reduced, but the ability to accurately differentiate movement types deteriorates
Solution Approach 1:
The system utilizes characteristic vibration patterns and acceleration waveforms generated by different transportation modes to identify electric train movement. By analyzing the frequency, amplitude, and pattern of acceleration sensor outputs, the system accurately differentiates electric train movement from other transportation modes, enabling reduced GPS frequency while maintaining detection accuracy.
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
The apparatus achieves accurate migration path determination for electric trains with reduced power consumption by selectively using GPS and autonomous navigation, allowing for efficient power management and precise route tracking even in environments with limited GPS availability.
Implementation Method 1
a GPS reception antenna 14
Implementation Method 2
three-axis acceleration sensor 17 to measure three-axis direction acceleration
Implementation Method 3
three-axis terrestrial magnetism sensor 16 to measure three-axis terrestrial magnetism
Data Source
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AI summary
A positioning apparatus includes: a position measuring section to obtain measured position data by measuring its own present position; a positioning controlling section to control operation timing of the position measuring section to make the position measuring section discontinuously obtain the measured position data; a movement measuring section to measure a movement operation; a moving method judging section to judge a moving method based on a measurement result of the movement measuring section; a map data storage section to store information of a rail route map; and a migration path judging section to judge a migration path in a period judged to be a moving state by an electric train by the moving method judging section based on the measured position data measured by the position measuring section and the information of the rail route map.