Wearable Device Mounting Determination Using GPS Signal Quality
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Solution Overview
Problem
Existing wearable devices struggle with accurate detection of whether they are mounted on a living body or a fitting, due to issues like erroneous detection when the user is still or when environmental temperatures are similar to body temperature.
Innovation Solution
A wearable device that includes a base member, a GPS receiving quality index acquisition means, a sensor that outputs signals based on positional relations, and a transmitting means to determine mounting status based on both GPS signal quality and sensor output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only sensor output (acceleration or temperature) is used for mounting determination, then the device complexity is low, but measurement precision deteriorates due to erroneous detection when user is still or environmental temperature is similar to body temperature
Solution Approach 1:
The patent combines GPS receiving quality index and sensor output into a unified mounting determination system. The mounting determination unit integrates both data sources to make a comprehensive judgment, merging multiple detection approaches to resolve the contradiction between accuracy and complexity.
Solution Approach 2:
The patent introduces a new parameter (GPS receiving quality index) to complement the existing sensor output parameter. By changing the parameter set used for mounting determination and analyzing their relationship, the system achieves higher accuracy without excessive complexity increase.
2Measurement precision
If GPS receiving quality index and sensor output are both used for mounting determination, then measurement precision improves, but device complexity increases
Solution Approach 1:
The GPS receiver serves multiple functions: it provides positioning information and simultaneously provides receiving quality index for mounting determination. This multi-functionality approach allows the system to use existing components for multiple purposes, improving accuracy without proportionally increasing complexity.
3Reliability
If temperature sensor is used for mounting determination, then ease of operation is good, but reliability deteriorates when atmospheric temperature or object temperature is close to body temperature
Solution Approach 1:
The GPS receiving quality index acts as an intermediary indicator that indirectly reflects mounting status. Instead of directly measuring temperature and comparing with body temperature, the system uses GPS signal quality as a mediator to infer mounting state, improving reliability without complicating operation.
4Reliability
If acceleration sensor is used for mounting determination, then ease of operation is good, but reliability deteriorates when user stays still causing acceleration speed to become zero
Solution Approach 1:
The patent transitions from a static detection approach (checking if acceleration is zero) to a dynamic approach (analyzing the relationship between GPS receiving quality and sensor output over time). This dynamic analysis allows the system to distinguish between stillness due to mounting and stillness due to user inactivity, improving reliability while maintaining operational simplicity.
Data Source
AI summary
In order to provide a wearable device that enables determining with high accuracy whether the wearable device is mounted on a living body or a fitting to be worn by a living body, the wearable device includes a base member, a receiving quality index acquisition unit, a sensor, and a transmitter. The receiving quality index acquisition unit receives a GPS signal, and acquires a receiving quality index of the GPS signal. The sensor outputs a signal depending on a positional relation of the living body and the sensor or the fitting and the sensor. The transmitter transmits the receiving quality index and the output of the sensor to a mounting determination unit. The determination unit determines whether the wearable device is mounted on the living body or the fitting, based on the receiving quality index and the output of the sensor.