Phase Array Antenna Beam Steering for Train Position Detection
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Solution Overview
Problem
Conventional RFID systems for detecting the position of high-speed trains face challenges in maintaining a sufficient contact period between the reader and the tag due to the train's speed, leading to inaccurate position detection and increased equipment costs when using stronger waves or wider beams, with interference from adjacent tags complicating the process.
Innovation Solution
An apparatus equipped with a phase array antenna, transceiver, beam generator, and processor that electrically controls beams in multiple directions to increase the contact period between the reader and the tag, using beam steering and phase array technology to enhance detection accuracy while minimizing additional elements and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a relatively stronger wave or a relatively wider width beam is used, then the contact period between reader and tag is increased, but the position detection accuracy is degraded due to interference from adjacent tags
Solution Approach 1:
The patent divides the beam into multiple directional components using a phase array antenna, allowing the reader to selectively direct energy toward specific tags along the train track. This segmentation enables the system to maintain a longer contact period by sweeping beams across multiple directions while preventing interference from adjacent tags through spatial selectivity.
Solution Approach 2:
The patent applies local quality by directing the beam energy specifically toward the target tag's location rather than using a wide omnidirectional beam. The phase array antenna creates localized beam patterns that concentrate energy at the desired position, improving both contact duration and position detection accuracy by avoiding interference from adjacent tags.
2Duration of action of moving object
If the frequency is changed for charging or communication, then the contact period is extended, but the equipment cost increases due to additional elements required in reader and tag
Solution Approach 1:
The patent uses a dynamic beam steering mechanism controlled by a phase array antenna that can electronically adjust beam direction and focus without changing frequency. This dynamic control allows the reader to extend the contact period by moving the beam along the train track, eliminating the need for additional frequency-changing elements in both reader and tag equipment.
Solution Approach 2:
The patent replaces the mechanical approach of frequency changing with an electronic beam steering system using phase array technology. Instead of altering the operating frequency to extend contact time, the system uses electronic phase control to direct the beam, thereby extending contact period without adding costly frequency-changing components to the equipment.
3Duration of action of moving object
If a relatively stronger wave is used, then the contact period is increased, but the position detection accuracy is degraded due to interference from adjacent tags
Solution Approach 1:
The patent applies local quality by creating localized beam patterns that concentrate energy at the target tag's position. The phase array antenna controls the spatial distribution of energy, directing it precisely where needed while minimizing spill-over to adjacent tags, thus extending contact period without increasing interference from neighboring tags.
Solution Approach 2:
The phase array antenna acts as an intermediary between the reader and the tag, providing controlled beam directionality. This intermediary device enables the reader to maintain focus on the target tag throughout the contact period while filtering out interference from adjacent tags through spatial selectivity.
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 solution allows for accurate detection of the train's position even at high speeds by extending the communication period and reducing interference from adjacent tags, while maintaining a lower equipment cost by utilizing conventional tags and controlling beam direction based on train speed.
Implementation Method 1
a reader equipped on the train and a tag (or a balise) equipped on a sleeper or a ballast
Implementation Method 2
The beam generator may forms the beams on the signals inputted in every antenna channel from the transceiver to form the beam along the direction toward the tag
Data Source
AI summary
An apparatus for detecting a position of a train, the apparatus includes a reader. The reader electrically irradiates beams along a plurality of directions toward a tag, combines signals received from the tag and obtains a beam direction information toward the tag, and then detects the position of the train using the beam direction information and a tag information of the tag.