Position Correction Using Sensor Reliability for Trajectory Accuracy
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Solution Overview
Problem
Existing position measurement techniques in portable devices face challenges in achieving high trajectory accuracy while minimizing GPS function usage to conserve power, as intermittent GPS operation can lead to reduced accuracy in correcting moving paths.
Innovation Solution
A position measurement apparatus and method that includes a position estimation unit, an absolute coordinate measurement unit, and a correction processing unit, which generates attitude and movement information from sensor data, calculates reliability values, and corrects movement distance and direction every predetermined number of steps based on these values, allowing for accurate trajectory correction even with reduced GPS frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If GPS function is operated intermittently to reduce power consumption, then power consumption is reduced, but trajectory correction accuracy deteriorates
Solution Approach 1:
The system performs preliminary correction calculations by accumulating sensor data over predetermined time periods or step counts. Instead of correcting position continuously or frequently using GPS, the system prepares correction amounts in advance based on sensor information (acceleration, gyro, geomagnetic data) and applies them when GPS data becomes available, enabling accurate correction even with intermittent GPS operation
Solution Approach 2:
The invention introduces sensor-based position estimation as an intermediary between GPS measurements. The sensor information (acceleration sensor, gyro sensor, geomagnetic sensor) serves as a mediator that continuously tracks movement between GPS updates, allowing the system to maintain accurate trajectory information without requiring frequent GPS corrections
2Use of energy by moving object
If GPS function is operated intermittently to reduce power consumption, then power consumption is reduced, but position measurement accuracy deteriorates
Solution Approach 1:
The system calculates correction amounts in advance based on sensor data accumulation over predetermined periods or step counts, preparing position correction information before GPS updates occur. This preliminary preparation ensures that when GPS data is received, accurate correction can be applied immediately, maintaining position measurement reliability with reduced GPS frequency
Solution Approach 2:
The system uses sensor data (acceleration, gyro, geomagnetic sensors) to continuously monitor and estimate position changes between GPS updates. This feedback mechanism allows the system to track position accurately in real-time and apply corrections based on the difference between estimated and GPS-measured positions, maintaining reliability with intermittent GPS operation
Data Source
AI summary
In a position measurement apparatus, to maintain accuracy of a trajectory even when the frequency of acquisition of absolute position information is reduced, a movement information generation unit generates movement information including a movement distance and a movement direction of a device of interest based on a sensor value, and a reliability generation unit generates reliability information indicating a reliability value of the movement information. An amount of distance correction and an amount of angle correction to be made every predetermined number of steps are determined based on the reliability information and the movement information, and the distance and the angle are corrected every predetermined number of steps starting from the latest already-corrected position information.