Train Location Measurement via Bidirectional RSSI Error Compensation
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Solution Overview
Problem
Conventional train location measurement systems experience accuracy degradation due to interference signals and fading, affecting the reliability of received signal strength indicator (RSSI) measurements.
Innovation Solution
A train location measurement system that includes a ground device generating location measurement data signals, transmitted to onboard stations on a train, which measure received signal strengths and error information from base stations in both the travel direction and opposite direction, allowing the onboard device to calculate the train's location using this data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSSI measurements are used for location measurement in a wireless environment, then location measurement can be implemented, but measurement accuracy degrades due to interference signals and fading effects
Solution Approach 1:
The patent segments the location measurement process by using multiple independent measurements from different base stations and combining them through statistical processing. Instead of relying on a single RSSI measurement, the system divides the measurement into multiple samples and uses average value calculation to reduce the impact of interference and fading on the final location determination
Solution Approach 2:
The patent implements feedback mechanisms where measurement results are continuously monitored and used to adjust subsequent measurements. The system uses historical measurement data and error information to refine location estimates, creating a closed-loop system that improves accuracy over time by compensating for environmental variations and interference patterns
2Area of stationary object
If multiple base stations are used for location measurement, then measurement coverage is improved, but system complexity increases
Solution Approach 1:
The patent makes the base stations universal by enabling each base station to perform multiple functions: signal transmission, location measurement, and error detection. The same infrastructure used for communication also serves location measurement purposes, eliminating the need for separate dedicated measurement devices and reducing overall system complexity while maintaining wide coverage
Solution Approach 2:
The patent merges the location measurement function with the existing wireless communication infrastructure. By combining location measurement capabilities into the regular base station network, the system achieves extended coverage without proportionally increasing complexity, as the measurement process utilizes existing signal paths and processing resources
Data Source
AI summary
A train location measurement system includes a ground device that generates a signal that contains location measuring data, a base stations that each transmit the signal to the train, an onboard station that measures a first received signal strength of a first signal received from a first base station located in a travel direction of the train, and generates, using the location measuring data, first error information indicating an error occurrence status upon reception of the first signal, an onboard station that measures a second received signal strength of a second signal received from a second base station located in a direction opposite the travel direction of the train, and generates, using the location measuring data, second error information indicating an error occurrence status upon reception of the second signal, and an onboard device that measures the location of the train.