Inertial Sensor Correction Using Stable-State Motion Calibration
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Solution Overview
Problem
Existing inertial sensor systems suffer from inaccuracies and drift in position and motion data due to sensor errors, which are not effectively compensated for during operation, leading to reduced accuracy and efficiency in navigation and motion determination.
Innovation Solution
A method and apparatus for operating an inertial sensor system that detects a stable state of motion, calculates average speed and orientation, and adjusts parameters for a correction model using a probabilistic filter to minimize differences in motion and orientation, allowing dynamic compensation of sensor errors during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If sensor systems operate for extended periods, then continuous motion data can be collected, but sensor errors cause drift and reduced accuracy in position and motion data
Solution Approach 1:
The system performs preliminary calibration by detecting stable motion states and calculating correction parameters before these parameters are applied to compensate for sensor errors during extended operation, preventing drift accumulation
Solution Approach 2:
The system continuously monitors motion data, detects stable states, calculates orientation differences, and adjusts correction parameters based on the discrepancy between direction of motion and sensor orientation, creating a closed-loop feedback mechanism that maintains accuracy over time
2Measurement precision
If correction parameters are adjusted dynamically during operation, then accuracy is maintained, but additional processing steps and computational resources are required
Solution Approach 1:
The system dynamically adjusts correction parameters during operation based on detected stable motion states, allowing the correction model to adapt to changing conditions while maintaining a relatively simple processing architecture
Solution Approach 2:
The system changes correction parameters based on the calculated difference between direction of motion and sensor orientation during stable states, optimizing accuracy without requiring complex system redesign
3Reliability
If stable states are detected and correction parameters are calculated, then sensor errors are compensated, but processing time and computational resources are consumed
Solution Approach 1:
The system performs correction parameter calculation periodically during detected stable motion states rather than continuously, reducing processing time while maintaining effective error compensation when conditions allow
Solution Approach 2:
The system applies correction parameters selectively during stable states rather than continuously, performing partial correction actions when conditions are favorable and accepting reduced correction activity during unstable periods
Data Source
AI summary
A method for operating and calibrating an inertial sensor system. Parameters for a correction model are adjusted for compensating for sensor errors during operation. The parameters can be ascertained by evaluating a course of the speed.