Single-Antenna Motion Trajectory for Accurate Position Estimation
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in providing high-accuracy location and tracking services due to limitations in positioning protocols and techniques, especially when using a single antenna without camera feeds.
Innovation Solution
A tracking device estimates a set of virtual anchor points and identifies a subset with the least uncertainty in position estimation, adjusting user movement vectors based on uncertainty thresholds to improve geometric dilution of precision and round-trip time measurements, utilizing auditory and light cues when near the target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for positioning, then device complexity and cost are reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent transitions from using multiple antennas in space to using multiple reference points in time. By performing ranging measurements at different reference points across time, the system creates a temporal dimension that compensates for the spatial limitation of having only one antenna, thereby maintaining positioning accuracy without requiring multiple physical antennas
Solution Approach 2:
The system performs preliminary ranging measurements at multiple reference points before final position estimation. By pre-establishing distance measurements from the user equipment to multiple reference points at different times, the system builds up the necessary data to calculate accurate position without requiring multiple simultaneous antennas
2Measurement precision
If multiple ranging measurements are performed at multiple reference points, then position estimation accuracy is improved, but measurement time and processing complexity increase
Solution Approach 1:
The system performs more ranging measurements than strictly minimum required, conducting measurements at multiple reference points even when some might suffice. This excessive sampling ensures robust position estimation by capturing geometric dilution of precision variations, and the system then selects the optimal subset of measurements to balance accuracy with time efficiency
Solution Approach 2:
The system continuously monitors position estimate uncertainty during the measurement process and uses this feedback to determine when sufficient accuracy has been achieved. By stopping measurements once the uncertainty falls below a threshold, the system optimizes the balance between measurement time and positioning accuracy
Data Source
AI summary
Aspects presented herein enable accurate tracking using single antenna. In one aspect, a first user equipment (UE) performs a ranging measurement against a second UE from each reference point of a set of reference points. The first UE identifies a subset of at least three reference points from the set of reference points based on a position estimate uncertainty calculated from the ranging measurements performed at the at least three reference points having a least position estimate uncertainty. The first UE provides (i) a first indication for moving the first UE along a first vector if the position estimate uncertainty is within a first threshold range or above a first threshold, and/or (ii) a second indication for moving the first UE along a second vector if the position estimate uncertainty associated with the at least three reference points is within a second threshold range or less than a second threshold.