Wrist Terminal Position Filter for GPS Signal Loss
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Solution Overview
Problem
Existing GPS positioning systems face challenges in accurately determining the appropriateness of position information when GPS signals are lost, leading to errors and reduced accuracy in tracking user movements.
Innovation Solution
A wrist terminal equipped with a control unit, sensors, and filters (acceleration, loss extension, and positioning context filters) that process GPS data to exclude invalid information, determine the type of user behavior, and adjust parameters for improved accuracy, ensuring accurate position determination even during signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS position information is continuously displayed, then the user can track movement trajectory, but positioning accuracy deteriorates when GPS signals are lost
Solution Approach 1:
The system performs preliminary actions by detecting loss parts in position information before they cause accuracy deterioration. The determination unit identifies periods where GPS signals are lost, and the display control unit suppresses display of position information during these periods, preventing inaccurate data from degrading overall positioning reliability.
Solution Approach 2:
The patent introduces an intermediary determination unit that acts as a mediator between the position information acquiring unit and the display control unit. This determination unit analyzes position information to detect loss parts and generates determination results that guide whether to display or suppress position information, thereby protecting against accuracy deterioration while maintaining reliable tracking.
2Measurement precision
If position information is suppressed after signal loss, then positioning accuracy is maintained, but information completeness deteriorates
Solution Approach 1:
The system applies partial action by selectively suppressing only the position information that contains loss parts, rather than suppressing all position information continuously. The display control unit displays position information when it is appropriate (when no loss parts are detected) and suppresses it only when determination results indicate inappropriateness, thereby maintaining information completeness while preserving positioning accuracy.
3Measurement precision
If multiple filters are applied to position information, then determination accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the position information processing into distinct functional units: an acceleration filter that processes acceleration data, a loss extension filter that detects loss parts, and a positioning context filter that evaluates positioning appropriateness. Each filter operates independently on specific aspects of the position information, improving determination accuracy through specialized processing while managing complexity through modular design.
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3C
AI summary
Appropriateness/inappropriateness of position information of a user is determined. A wrist terminal 1 includes a positioning information acquiring unit 51 and a second filter processing unit 55. The positioning information acquiring unit 51 acquires a series of position information of a user. The second filter processing unit 55 detects whether or not a loss part, in which position information corresponding to a predetermined time or a predetermined number of times of measurement is lost, is present in the series of position information acquired by the positioning information acquiring unit 51. The second filter processing unit 55, in a case where the loss part is detected, specifies the loss part and a part corresponding to a predetermined time or a predetermined number of times of measurement from the loss part as a part that is not appropriate for display in the series of position information.