RFID Pose Estimation Using Directional Scanner Peak Signal Strength
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Solution Overview
Problem
Existing pose estimation technologies face challenges in accurately determining the position and orientation of a device relative to an environment, especially in closed spaces where GPS signals are limited and optical solutions are sensitive to line of sight issues.
Innovation Solution
A directional scanner receives signals from at least three RFID tags at various orientations, using peak signal strengths to estimate the pose of a device through algorithms like the three-point, five-point, or seven-point method, which determines a transformation matrix for 3D visualization and navigation applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS is used for position determination, then outdoor location accuracy is improved, but reliability in closed spaces deteriorates
Solution Approach 1:
The patent introduces RFID tags as intermediary objects attached to environmental features. Instead of relying directly on GPS satellites, the system uses these tags as local reference points that emit identifiable signals. The scanner detects these tag signals to triangulate position, replacing the GPS satellite intermediary with locally-deployed RFID tag intermediaries that work indoors.
2Measurement precision
If optical motion capture technology is used, then pose estimation capability is improved, but sensitivity to line of sight occlusion worsens
Solution Approach 1:
The patent replaces optical detection mechanisms with radio frequency detection. Instead of using cameras or optical sensors that require direct visual line of sight, the system employs RFID scanners that detect electromagnetic signals from tags. Radio waves penetrate obstacles that block light, eliminating the line-of-sight constraint while maintaining pose estimation capability through signal-based triangulation.
3Device complexity
If RFID signal strength alone is used for positioning, then system complexity is reduced, but measurement precision in determining peak signal orientation deteriorates
Solution Approach 1:
The patent transforms the static RFID scanner into a dynamic scanning system that rotates through multiple orientations. The scanner actively changes its angular position to sweep through different directions, detecting signal strength variations as a function of orientation. This dynamic scanning approach allows the system to identify the peak signal orientation angle by observing which orientation yields maximum signal strength, thereby determining the angular position of tags without requiring complex directional antennas.
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 approach provides reliable pose estimation indoors without the need for GPS signals and avoids line of sight limitations, enhancing accuracy and applicability in navigation and localization tasks.
Implementation Method 1
a directional scanner receives signals from at least three RFID tags at a plurality of orientations of the directional scanner
Data Source
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AI summary
An apparatus includes a directional scanner (104) configured to receive signals from at least three RFID tags (121, 122, 123, 124, 126, 127, 128) at a plurality of orientations (112, 114) of the directional scanner. The apparatus includes a pose estimator (140) configured to estimate a pose of a device that includes or is coupled to the directional scanner based on orientation data indicating orientations of the directional scanner associated with determined peak signal strengths associated with the at least three RFID tags.