Wireless Positioning Reliability via Coincidence Distribution Flatness
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Solution Overview
Problem
Conventional wireless positioning technologies face reliability issues due to the ambiguity in determining the correct position when multiple locations show high coincidence between positioning and reference trajectories, leading to potential malfunctions in control systems.
Innovation Solution
A wireless positioning apparatus that includes reference trajectory storage, reception state detection, distance measurement, positioning trajectory generation, distribution calculation, and reliability evaluation to assess the reliability of positioning information based on the flatness of coincidence distribution, preventing the use of unreliable positioning data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If positioning result is determined from the location with highest degree of coincidence between positioning trajectory and reference trajectory, then positioning speed is improved, but positioning reliability deteriorates when multiple locations show high coincidence
Solution Approach 1:
The patent segments the positioning evaluation process into two distinct stages: first identifying the location with maximum coincidence degree, then separately evaluating the reliability of this positioning result by analyzing the distribution characteristics of coincidence degrees across all candidate locations. This segmentation allows the system to maintain fast positioning response while adding a reliableness verification layer.
Solution Approach 2:
The patent introduces a feedback mechanism where the distribution of coincidence degrees from multiple candidate locations is analyzed to evaluate positioning reliability. The reliability evaluation unit uses the coincidence degree distribution as feedback to determine whether the positioning result from the maximum coincidence location is trustworthy, preventing erroneous positioning when multiple locations show similar high coincidence.
2Device complexity
If conventional wireless positioning is used without reliability evaluation, then device complexity is reduced, but control system malfunction risk increases
Solution Approach 1:
The patent introduces an intermediary reliability evaluation unit that acts as a mediator between the positioning trajectory comparison unit and the control system. This unit analyzes the coincidence degree distribution and provides reliability assessment, preventing direct transmission of potentially erroneous positioning results to the control system while maintaining overall system architecture simplicity.
3Measurement precision
If GPS is used for positioning, then positioning accuracy is improved in open areas, but positioning availability deteriorates in shadows of buildings and indoors
Solution Approach 1:
The patent replaces the GPS satellite-based electromagnetic positioning system with a terrestrial wireless infrastructure-based positioning system. Instead of relying on satellite signals that are blocked by buildings, the system uses local wireless transmitters and receivers to create positioning trajectories based on signal reception characteristics, enabling positioning in urban canyons and indoor environments where GPS fails.
Data Source
AI summary
In a wireless positioning apparatus mounted in a moving body, feature point position information is stored in a reference trajectory storage, a reception state of transmitted waves from a wireless transmitter is detected, and a movement distance of the moving body is measured. A positioning trajectory is generated that indicates a correspondence relationship between the movement distance and the reception state of transmitted waves. A coincidence distribution is generated that indicates a correspondence between: a point on the reference trajectory to which a representative position, set arbitrarily within the positioning trajectory, corresponds for each coordinate shift value; and the degree of coincidence between the reference trajectory and the positioning trajectory. Based on the coincidence distribution, positioning information is generated. Reliability is determined based on an evaluation value reflecting a flatness of the coincidence distribution. The reliability serves as a determination criterion for determining whether or not the positioning information is used.