GNSS Device Control via Periodic Activation and Inertial Navigation
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Solution Overview
Problem
GNSS devices in mobile applications, such as bike computers, face high power consumption issues due to continuous operation, which is unsustainable with limited battery capacity.
Innovation Solution
A method and system that periodically activates and deactivates the GNSS device based on determining the travel road using map data and inertial measurement unit data, minimizing active GNSS usage by activating it only when necessary to maintain accurate position information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the GNSS device is continuously activated to accurately track position information, then position tracking accuracy is improved, but power consumption increases
Solution Approach 1:
The system periodically activates and deactivates the GNSS device based on whether the vehicle is on a determined travel road. When on the travel road, the GNSS device is deactivated and inertial navigation is used. When deviation is detected, the GNSS device is reactivated to correct position information, thus reducing power consumption while maintaining position tracking accuracy.
2Use of energy by moving object
If the GNSS device is deactivated to reduce power consumption, then power consumption is reduced, but position tracking accuracy deteriorates
Solution Approach 1:
The system introduces an intermediary inertial navigation system that uses map data and sensor information to estimate position when the GNSS device is deactivated. This intermediary system maintains position tracking accuracy during GNSS deactivation, and when deviation is detected, the GNSS device is reactivated to correct the inertial navigation estimates.
3Measurement precision
If the GNSS device is frequently activated to ensure accurate position information, then position information accuracy is improved, but battery life is reduced
Solution Approach 1:
The system implements periodic activation of the GNSS device only when necessary (when deviation from the travel road is detected), rather than continuous activation. This periodic operation significantly extends battery life while maintaining position information accuracy through inertial navigation during GNSS deactivation periods.
Solution Approach 2:
The system uses the vehicle's own sensors (accelerometer, gyroscope, speed sensor) to self-determine position and detect deviation from the travel road, eliminating the need for continuous GNSS activation. The system serves itself by using onboard resources to maintain position tracking accuracy.
Data Source
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AI summary
Disclosed is a method and a system for controlling a GNSS device that can reduce power consumption by acquiring position information through a GPS only at necessary point in time. According to an aspect of the present invention, a GNSS device control method for controlling a global navigation satellite system (GNSS) device installed in a movement means includes by a GNSS device control system, acquiring map data; by a GNSS device control system, periodically performing a predetermined first process while the GNSS device is active; and by a GNSS device control system, periodically performing a predetermined second process while the GNSS device is deactivated.