Locating Apparatus Using Dynamic Radio Data for Accurate Positioning
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Solution Overview
Problem
Existing locating techniques fail to accurately locate communication devices when the radio wave propagation environment changes due to obstacles or movements within the space.
Innovation Solution
A locating system comprising a controller, storage, and communicator that updates and compares radio communication data to identify the nearest installed device to a mobile terminal based on electric field intensity, allowing for accurate location even with changing environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radio signals are used for locating communication devices, then the locating technique works under presumption of no obstacles, but the radio signals are affected by multipath fading when obstacles are present, causing inaccurate location
Solution Approach 1:
The system performs preliminary measurements of radio signal characteristics (electric field intensity, propagation time, arriving angle) between fixed installed devices before actual locating operations. These preliminary results are stored as reference data that accounts for the specific environmental conditions including obstacles. During actual locating, the system compares real-time measurements against this pre-established reference data, enabling accurate location determination even when multipath fading occurs due to obstacles or movement.
2Measurement precision
If radio communication data is recorded in advance for each divided area, then the locating apparatus can locate communication terminals, but the radio wave propagation environment may change due to obstacles moving, causing the recorded data to become outdated
Solution Approach 1:
The system implements dynamic updating of reference data by periodically re-measuring radio signal characteristics between installed devices and storing these updated measurements as new reference data. This transforms the static reference data into a dynamic structure that adapts to changing environmental conditions. The system can switch between different versions of reference data, allowing it to maintain accurate location determination even as obstacles move or the propagation environment changes over time.
3Measurement precision
If multiple physical quantities (electric field intensity, propagation time, arriving angle) are measured, then the location can be determined more accurately, but the complexity of measurement and data processing increases
Solution Approach 1:
The system measures multiple physical quantities (electric field intensity, propagation time, arriving angle) between installed devices, but during actual locating operations, it can selectively use one or more of these measurements depending on the situation. The system calculates a similarity evaluation value based on the measured quantities and compares it against reference data, allowing accurate location determination without requiring all measurements to be processed simultaneously, thus managing complexity while maintaining precision.
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
Ensures accurate location of communication terminals in dynamic radio wave propagation environments by continuously updating and referencing radio communication data, thereby adapting to changes caused by obstacles or movements.
Implementation Method 1
the electric field intensity of radio signals changes according to the distance between the radio transmitter and radio receiver
Implementation Method 2
the radio signals are affected by multipath fading and the like
Data Source
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AI summary
A locating apparatus comprises a first acquirer requesting multiple installed devices installed within a given space to radio-communicate with each other so as to acquire first radio communication information representing a first physical quantity obtained for each pair of the installed devices for each of the installed devices; a storage recording the first radio communication information acquired by the first acquirer for each of the installed devices; a second acquirer requesting a terminal present within the given space and the multiple installed devices to radio-communicate with each other so as to acquire second radio communication information representing a second physical quantity obtained for each pair of the terminal and installed devices; and a detector detecting the installed device from which the first physical quantity close to the second physical quantity is obtained among the multiple installed devices.