Positioning Control Device GPS Signal Timing
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Solution Overview
Problem
Conventional electronic devices face challenges in maintaining accurate positioning when GPS signals are intermittently received, leading to increased errors in pedestrian dead reckoning, particularly in environments where satellite visibility changes due to terrain, resulting in prolonged fixation times and unsatisfied positioning performance.
Innovation Solution
An electronic device with a receiving unit, processor, and storage unit that executes a geographical condition acquisition process and satellite identification process to control GPS signal reception based on geographical conditions, determining the optimal timing to turn GPS signals ON/OFF to minimize positioning errors and ensure required positioning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS reception is continuously performed, then positioning accuracy is maintained, but power consumption increases and positioning performance is not satisfied in environments with poor satellite visibility
Solution Approach 1:
The system performs preliminary assessment of satellite visibility conditions before deciding to activate GPS reception. By evaluating geographical conditions and predicting satellite capture feasibility in advance, the device avoids unnecessary continuous reception, thereby reducing power consumption while maintaining positioning accuracy when conditions are favorable
Solution Approach 2:
The GPS reception control is made dynamic rather than static. The system continuously monitors satellite visibility conditions and adjusts reception state accordingly - switching between active reception when satellites are visible and inactive state when they are not, optimizing both power consumption and positioning accuracy adaptively
2Use of energy by moving object
If GPS reception is interrupted to save power, then power consumption decreases, but positioning errors increase due to prolonged dead reckoning
Solution Approach 1:
The system predicts satellite capture conditions in advance using geographical information and satellite orbit data. By determining beforehand whether satellites will be visible within a certain time window, the device can confidently interrupt reception to save power while ensuring that positioning accuracy will be restored when satellites become visible
Solution Approach 2:
The system uses feedback from satellite visibility assessments to control reception timing. By continuously evaluating whether satellites can be captured based on current geographical conditions and predicted future positions, the device optimizes the timing of reception activation to minimize positioning errors while maximizing power savings
3Measurement precision
If GPS reception is performed in all environments, then positioning accuracy is maintained, but device complexity increases due to unnecessary reception control mechanisms
Solution Approach 1:
The system applies different reception strategies to different geographical conditions. Instead of using a uniform complex control mechanism everywhere, it selectively activates advanced satellite visibility prediction and intermittent reception control only when geographical conditions warrant it, thereby reducing overall device complexity while maintaining positioning accuracy
Data Source
AI summary
An electronic device includes a GPS unit, a GPS information acquisition unit, a sensor information acquisition unit, and a reception condition determination unit. The GPS unit receives a radio wave from at least one of a plurality of positioning satellites. The GPS information acquisition unit acquires ephemeris information by the GPS unit and acquires satellite arrangement information of each of the plurality of positioning satellites acquiring the ephemeris information. The sensor information acquisition unit acquires geographical condition information of a current location at which the electronic device is present. The reception condition determination unit identifies the number of positioning satellites that the receiving unit can capture at the current location among the plurality of positioning satellites acquiring the ephemeris information based on the geographical condition information of the current location and the satellite arrangement information.