Position Tracking with UWB Ranging and BLE Motion Fallback
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Solution Overview
Problem
Existing position determination devices fail to accurately determine the position of a mobile device when a set number or more of distance measurement values cannot be obtained due to obstacles obstructing wireless communication.
Innovation Solution
A position determination device that includes a communication unit with multiple communication devices capable of performing wireless communication, a main position determination unit to determine a first coordinate position based on distance measurement values, and a sub-position determination unit to determine a second coordinate position using movement values from a movement detection unit, allowing for coordinate position estimation even when distance measurement values are insufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireless communication is used for position determination, then measurement precision is improved, but reliability deteriorates when obstacles obstruct communication
Solution Approach 1:
The system changes the determination method parameter based on communication conditions. When distance measurement values are insufficient (communication obstructed), it switches from distance-based trilateration to movement-based dead reckoning, thereby maintaining position determination reliability under varying communication conditions
Solution Approach 2:
The system dynamically selects between two position determination methods (main unit using distance measurements and sub-unit using movement values) based on the availability of distance measurement data. This dynamic adaptation ensures continuous and reliable position determination even when wireless communication is partially obstructed
2Measurement precision
If multiple communication devices are used for position determination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The position determination function is segmented into two independent units: a main position determination unit that uses distance measurement values from multiple communication devices, and a sub-position determination unit that uses movement values. This segmentation allows the system to use multiple communication devices when needed for high precision while having a fallback mechanism that reduces complexity requirements when communication is obstructed
Data Source
AI summary
A position determination device includes: a communication unit including communication devices to perform wireless communication with a mobile terminal 1, the communication devices to repeatedly perform UWB communication for detecting a distance measurement value Vr, at least one of the communication devices being configured to repeatedly perform BLE communication for receiving the movement value Vm; a main position determination unit to determine a first coordinate position Pf(n) as a position of the mobile terminal, based on distance measurement values Vr; a sub-position determination unit to determine a second coordinate position Ps(n) as a position of the mobile terminal 1, based on the movement value Vm; and a determination position setting unit to set any one of the first coordinate position Pf(n) and the second coordinate position Ps(n) as a determination coordinate position Pj(n) that is a current position of the mobile terminal.