Wireless Position Estimation Using Low-Mounted Fixed Communicators
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Solution Overview
Problem
Position estimation precision deteriorates when there is a shield between devices due to poor communication, leading to inaccurate measurements.
Innovation Solution
A control device and system that includes a position fixed type communication device mounted closer to the floor than the ceiling within a target space, and a control section that estimates the relative position of a position changeable type communication device based on distance measurements between these devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is performed between devices with a shield between them, then communication can be established, but measurement precision deteriorates due to poor communication
Solution Approach 1:
The patent applies local quality by positioning the fixed communication device at a specific location (lower than the center in the vertical direction) rather than uniformly distributing devices. This localized positioning optimizes the detection of direct waves in specific spatial zones, improving position estimation precision in areas where shields would otherwise block signals.
Solution Approach 2:
The patent introduces vertical dimension consideration by specifying that the fixed communication device be positioned lower than the center in the vertical direction. This dimensional approach allows the system to exploit spatial diversity in signal propagation, detecting direct waves that travel through lower paths less affected by shields positioned higher in the space.
2Measurement precision
If a communication device is positioned to detect direct waves, then position estimation precision improves, but the device complexity increases due to specific positioning requirements
Solution Approach 1:
The patent simplifies device complexity by specifying a simple vertical position criterion (lower than center) for the fixed communication device rather than requiring complex three-dimensional positioning or multiple devices. This single positional parameter is easy to implement while effectively enabling direct wave detection.
Solution Approach 2:
Instead of positioning the fixed communication device at the center or upper position where it might be blocked by shields, the patent inverts the approach by positioning it lower than the center. This inverted positioning allows the device to detect direct waves that pass through lower spatial paths, avoiding obstruction from shields positioned higher in the target space.
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
Improves position estimation precision by ensuring direct waves are detected as first arrival waves, reducing errors in distance and angle calculations, and accurately determining the location of the communication device within the vehicle compartment.
Implementation Method 1
a distance measurement value being obtained when a position fixed type communication device and the position changeable type communication device perform wireless communication
Data Source
AI summary
There are provided a control device, a control system, and a program that can improve position estimation precision. A control device includes a control section configured to obtain a distance measurement value, and estimate a relative position of the position changeable type communication device with respect to a target space based on the distance measurement value, the distance measurement value being obtained when a position fixed type communication device and the position changeable type communication device perform wireless communication, and indicating a distance between the position fixed type communication device and the position changeable type communication device, the position fixed type communication device being fixed to a position that is inside the target space, and is closer to a floor part than to a ceiling part of the target space, and the relative position of the position changeable type communication device with respect to the target space being changeable.