Variable Directivity Antenna for Train Control Systems
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Solution Overview
Problem
Conventional train control systems based on fixed blocking are inadequate for high-speed and high-density operations due to their inability to account for diverse vehicle performances and require unnecessary distance maintenance from preceding trains, limiting their efficiency.
Innovation Solution
A train control system utilizing wireless communication with variable directivity antennas that dynamically adjust antenna patterns based on the train's position and ground apparatus locations to enhance communication reliability and allow for more precise speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed blocking control is used to ensure safety, then reliability is improved, but productivity deteriorates due to unnecessary distance maintenance
Solution Approach 1:
The patent transitions from fixed blocking to moving blocking, where the blocking distance dynamically adjusts based on actual train performance characteristics (braking distance, acceleration) and real-time operational conditions. This allows each train to maintain an optimized, minimal safe distance rather than a uniform excessive distance, thereby increasing line capacity while preserving safety
Solution Approach 2:
The system changes the parameter of blocking distance from a fixed value to a variable value that adapts to individual train characteristics and operational conditions. By calculating and applying train-specific braking distances and performance parameters, the system optimizes the safe following distance for each train, enabling higher density operations without compromising safety
2Reliability
If selection diversity with multiple antennas is used to improve communication reliability, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent employs a variable directivity antenna that dynamically changes its radiation pattern based on the train's position and orientation relative to ground apparatus. This dynamic beam steering capability allows a single antenna to achieve the communication reliability that would otherwise require multiple fixed antennas through selection diversity, thereby reducing system complexity
Solution Approach 2:
The system changes the parameter of antenna radiation pattern from fixed to variable by adjusting the beam direction and shape according to positional relationships. This parameter adaptation enables optimal communication link maintenance without requiring multiple physical antennas, resolving the contradiction between reliability and device complexity
3Reliability
If time diversity with repeated transmissions is used to improve communication reliability, then reliability is improved, but loss of time increases
Solution Approach 1:
The variable directivity antenna dynamically adjusts its beam to maintain optimal communication quality in real-time as the train moves, eliminating the need for repeated transmissions. This dynamic adaptation achieves communication reliability through spatial diversity rather than temporal repetition, thereby reducing communication time loss
Solution Approach 2:
The patent replaces the temporal mechanism (repeated transmissions over time) with a spatial mechanism (variable beam direction). By using spatial diversity through antenna pattern adjustment, the system achieves the same reliability effect as time diversity but without the time penalty, thus resolving the contradiction
4Productivity
If variable directivity antenna with dynamic pattern adjustment is used, then productivity is improved through better communication, but device complexity increases
Solution Approach 1:
The system uses feedback from positional information (train location, ground apparatus location) to automatically adjust the antenna pattern. This closed-loop control ensures optimal communication without requiring complex manual configuration or multiple antennas, achieving high-speed operation capability while managing device complexity through intelligent feedback-based adaptation
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 approach enables higher speed and density operations by improving communication reliability and allowing trains to utilize their full performance capabilities, reducing the need for excessive distance maintenance from preceding trains.
Implementation Method 1
transmit positional information including the traveling position or receive control information used to control the moving object from the ground apparatus via the first antenna pattern of the variable directivity antenna
Data Source
AI summary
According to one embodiment, an electronic apparatus mounted on a moving object, includes at least one variable directivity antenna; controlling circuitry configured to acquire a traveling position of the moving object and determine an antenna pattern for the variable directivity antenna based on a location of a ground apparatus to be a communication target and the acquired traveling position; and a communication circuit configured to transmit positional information including the traveling position or receive control information from the ground apparatus via the variable directivity antenna for which the determined antenna pattern is set.