Wearable Positioning Device Swimming Mode Control
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Solution Overview
Problem
Conventional GPS-based positioning devices, such as sports watches, face challenges in accurately tracking positions during swimming due to signal attenuation underwater, leading to inaccurate measurements and power consumption issues.
Innovation Solution
A positioning control method and device that switches to a swimming mode, suppressing the use of received frequency and utilizing pseudo ranges to calculate positions using the least square method or Kalman filter processing, and selectively operating the reception unit based on whether the device is underwater to improve accuracy and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the GPS receiver continuously operates to track position during swimming, then positioning coverage is maintained, but positioning accuracy deteriorates due to signal attenuation underwater
Solution Approach 1:
The patent applies dynamics by making the positioning operation mode changeable based on swimming detection. The system dynamically switches between standard positioning operations and swimming-specific positioning operations, adjusting the received frequency usage according to whether swimming is detected, thereby adapting to different operational conditions to maintain both coverage and accuracy
Solution Approach 2:
The patent changes the parameter of frequency usage in positioning calculations based on swimming detection. When swimming is detected, the system suppresses usage of received frequency and relies more on pseudo-range measurements, which are less affected by water attenuation, thereby maintaining positioning accuracy during swimming activities
2Productivity
If the received frequency is used for position calculation during swimming, then positioning operation continues, but positioning accuracy deteriorates due to signal attenuation and arm movement variations
Solution Approach 1:
The patent changes the parameter of frequency usage by suppressing received frequency utilization when swimming is detected. Instead, the system relies on pseudo-range measurements which are less susceptible to signal attenuation and Doppler effects caused by arm movements, thereby maintaining positioning accuracy while continuing positioning operations
Solution Approach 2:
The patent converts the harmful effect of signal attenuation and arm movement variations into a benefit by switching to pseudo-range-based positioning. The system recognizes that received frequency becomes unreliable during swimming and deliberately suppresses its usage,转而 relying on measurement types that are more robust to these conditions
3Reliability
If the reception unit operates continuously to maintain positioning, then positioning coverage is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the reception unit to operate intermittently based on swimming detection. When swimming is detected, the reception unit's operation is restricted or suspended, reducing power consumption during periods when signal quality would be poor anyway, while maintaining positioning coverage when conditions are favorable
Data Source
AI summary
A positioning control method of a positioning device worn on a user□s body includes switching a positioning mode to a swimming mode and executing a positioning operation for the swimming mode when the positioning mode is switched to the swimming mode.