Positioning Reliability Control for Portable Devices
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Solution Overview
Problem
Existing pedestrian dead reckoning (PDR) technologies lack a method to determine the reliability of positioning information, leading to user discomfort when the estimated traveling orientation diverges from the actual orientation, due to factors like device displacement, rotation, lateral, and backward movements.
Innovation Solution
An information processing device with a control unit that calculates the reliability of positioning information using sensed data from built-in sensors, such as acceleration, gyro, and geomagnetic sensors, and switches to alternative positioning methods when reliability decreases, displaying reliability changes to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pedestrian Dead Reckoning (PDR) is used to calculate estimated traveling orientation based on sensed information from portable devices, then positioning information can be obtained without external infrastructure, but the reliability of the positioning information decreases when displacement occurs between estimated and actual traveling orientation
Solution Approach 1:
The system continuously monitors the reliability of PDR-based positioning information and provides feedback to switch between positioning methods. When reliability exceeds a threshold, the system switches to PDR for power saving; when reliability falls below the threshold, it switches to GPS-based positioning to maintain accuracy, creating a closed-loop feedback control mechanism.
Solution Approach 2:
The system dynamically adjusts the positioning method based on real-time reliability assessment. The control unit switches between PDR and GPS positioning modes according to the calculated reliability value, making the system adaptable to changing conditions rather than using a fixed positioning approach.
2Use of energy by moving object
If PDR positioning is used continuously to save power, then energy consumption is reduced, but user comfort decreases when reliability is low due to displacement between estimated and actual orientation
Solution Approach 1:
The system changes the operational parameters of the positioning system by switching between PDR and GPS modes based on reliability thresholds. This parameter change allows the system to optimize power consumption while maintaining reliability above acceptable levels through conditional mode switching.
Solution Approach 2:
The control unit continuously evaluates positioning reliability and uses this feedback to determine when to switch between power-saving PDR mode and accurate GPS mode, creating an adaptive power management system that responds to real-time positioning quality.
3Measurement precision
If the system switches between PDR and alternative positioning methods based on reliability, then positioning accuracy is maintained, but device complexity increases due to multiple positioning methods and switching logic
Solution Approach 1:
The portable information processing device is designed with multi-functionality to support both PDR and GPS positioning methods, along with a control unit that manages switching between them. This universal design allows the single device to perform multiple positioning functions based on varying conditions.
Solution Approach 2:
The control unit acts as an intermediary that manages the switching between different positioning methods. It evaluates reliability and coordinates the transition between PDR and GPS modes, simplifying the overall system architecture by centralizing the decision-making logic in a single control component.
Data Source
AI summary
There is provided an information processing device including a control unit that determines reliability of positioning information of a user calculated on a basis of sensed information output from a sensing unit built in a portable information processing device. According to the present disclosure, it is possible to determine the reliability of positioning information. Note that the effects described above are not necessarily limitative. With or in the place of the above effects, there may be achieved any one of the effects described in this specification or other effects that may be grasped from this specification.