Weighted Signal Estimation for Electronic Label Positioning
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Solution Overview
Problem
Existing methods for estimating the position of electronic labels in retail stores are inaccurate due to signal obstructions caused by obstacles such as fixtures and products, which can lead to errors in determining product positions for restocking and logistics.
Innovation Solution
A method that uses a weighted average of signal strengths recorded by devices to estimate the position of an electronic label, where weights are formed based on signal strengths, providing a more robust and accurate position estimation even in the presence of obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods using signal strengths are used in a retail store, then the position of electronic labels can be estimated, but the accuracy is reduced due to signal obstructions from fixtures and products
Solution Approach 1:
The patent introduces reference electronic labels with known positions as intermediary elements. These reference labels serve as mediators between the signal transmission system and the positioning calculation, allowing the system to compensate for signal obstructions by comparing expected versus actual signal patterns. The reference labels create a calibration framework that accounts for the harmful effects of fixtures and products on signal propagation.
Solution Approach 2:
The patent changes the parameter approach by using multiple signal strength measurements from different devices and combining them through a weighted average calculation. Instead of relying on a single signal strength parameter that is easily affected by obstructions, the system uses multiple measurements and processes them to derive a more accurate position estimate, effectively changing how the position parameter is calculated to be more robust against signal variations.
2Measurement precision
If more reference points or devices are added to improve positioning accuracy, then position estimation can be enhanced, but device complexity and cost increase
Solution Approach 1:
The patent makes electronic labels serve multiple functions: they act as both the objects to be positioned and as signal transmission nodes. This multi-functionality reduces system complexity because the same electronic labels used for product information also serve for positioning, eliminating the need for separate positioning transmitters. The reference labels similarly serve dual purposes as both references and functional components of the retail display system.
Solution Approach 2:
The system uses existing electronic labels and devices in the retail environment to perform positioning functions without requiring additional dedicated positioning infrastructure. The electronic labels themselves participate in the positioning process by transmitting signals, and the existing store devices (mobile devices, fixed receivers) serve dual purposes for both store operations and positioning calculations, making the system self-sufficient.
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
The method improves the accuracy of position estimation by reducing the impact of signal strength deviations caused by obstacles, allowing for more precise tracking of product positions without the need for additional devices or complex arrangements.
Implementation Method 1
obtain information about signal strengths recorded at the respective devices when attempting to receive a wireless signal transmitted by the electronic label
Data Source
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AI summary
A system (100) and method (400) for estimating a position (211) of an electronic label (210, 510) in an area (300, 500) are provided. A plurality of devices (110) is distributed over the area. Information is obtained about signal strengths recorded at the respective devices when attempting to receive a wireless signal (212) transmitted by the electronic label. Weights are formed for positions (111, 116-119) associated with the devices, based on the signal strengths recorded at the corresponding devices. The position of the electronic label is estimated as a weighted average including the positions, wherein the positions are weighted by the weights. In some embodiments, information is instead obtained about signal strengths recorded at the electronic label when attempting to receive wireless signals (612) transmitted by the respective devices. The present method may for example be employed to estimate a position of a product (520) in a retail store.