Motion Tracking Sensor Pairing Using RSSI Change Authentication
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Solution Overview
Problem
Existing motion tracking systems face issues with incorrect wireless connections to sensors and user identification, leading to incorrect data registration and potential exposure of sensitive information, particularly in rehabilitation procedures.
Innovation Solution
A method involving a computing apparatus that processes radiofrequency signals from sensors, computes mean RSSI values and velocities of change, and establishes connections only with sensors showing consistent movement relative to the apparatus, using predetermined velocity thresholds to ensure correct sensor selection and user authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the computing apparatus connects to multiple sensors that radiate waves within detection range, then the system can track motion of multiple users, but the risk of connecting to incorrect sensors increases
Solution Approach 1:
The system performs preliminary actions by computing mean RSSI values and velocity of change metrics before establishing connections. Sensors are pre-evaluated based on their signal characteristics and movement patterns, allowing the computing apparatus to identify and connect to the correct sensors before motion tracking begins, thus preventing incorrect connections while maintaining multi-user capability
2Device complexity
If the computing apparatus uses basic RSSI values for sensor selection, then the connection process is simple, but incorrect connections occur when multiple sensors have similar signal strengths
Solution Approach 1:
The system changes the parameters used for sensor selection by computing not only mean RSSI values but also the velocity of change of these values. This additional parameter (velocity of change) provides a discriminating factor that enables accurate sensor identification even when multiple sensors have similar signal strengths, thereby improving measurement precision without significantly increasing device complexity
3Productivity
If the system establishes wireless connections without authentication, then the connection process is fast, but user information may be provided to wrong users
Solution Approach 1:
The system implements a feedback mechanism where sensors transmit identification data to the computing apparatus after connection establishment. The computing apparatus uses this feedback information to authenticate users and verify that motion tracking data is associated with the correct user profile, preventing information leakage to wrong users while maintaining fast connection establishment
Data Source
AI summary
A method for establishing wireless communications connections between sensors and a computing apparatus of a motion tracking system include the steps: processing radiofrequency signals received by the computing apparatus and transmitted by each sensor, each radiofrequency signal including an advertisement package of the respective sensor; providing a number of RSSI per sensor based on the processed radiofrequency signals; computing and storing mean RSSI values based on the number of RSSI so that a number of RSSImean values is computed per sensor; computing velocities of change of RSSImean, vRSSI, based on the number of RSSImean values so that a number of vRSSI values is computed per sensor; establishing the wireless communications for which at least the following is fulfilled: the computing apparatus determines that at least some vRSSI values within a first period of the number of vRSSI values of each sensor has a modulus greater than a predetermined minimum velocity.