Gyro Sensor Gain-Ratio Feedback for Angle Measurement Accuracy
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Solution Overview
Problem
Existing gyro sensors face errors in angle measurement due to gain errors in drive and detection signals between two vibration axes of the resonator, which are not effectively addressed by current technologies.
Innovation Solution
A gyro sensor with a control unit that includes a PLL, detection gain ratio corrector, drive gain ratio corrector, and angle feedback unit to correct and feedback the gain ratios, reducing errors by calculating and correcting detection and drive gain ratios, and performing feedback control to minimize deviation angles and resonance frequency differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gain errors in drive and detection signals are not corrected, then the device complexity remains low, but the measurement precision deteriorates due to angle measurement errors
Solution Approach 1:
The patent implements feedback control by detecting the deviation angle between the resonator's vibration axis and the electrode axis, then adjusting the drive signals to minimize this deviation. The control unit continuously monitors the vibration state and corrects gain errors in real-time, ensuring accurate angle measurements while maintaining system stability through closed-loop control
Solution Approach 2:
The patent changes the gain parameters of drive and detection signals dynamically based on the detected vibration state. By adjusting the gain ratios of signals applied to different electrodes and the sensitivity of detection electrodes, the system compensates for manufacturing variations and operational conditions, thereby improving measurement precision without requiring perfect initial calibration
2Measurement precision
If deviation angle between vibration axis and electrode axis is not minimized, then the ease of operation remains simple, but the measurement precision deteriorates due to gain ratio errors
Solution Approach 1:
The resonator system performs self-alignment by utilizing its own vibration characteristics to detect and correct the deviation angle. The control unit monitors the vibration response and automatically adjusts the drive signals to align the vibration axis with the electrode axis, eliminating the need for external alignment tools or complex manual calibration procedures
Solution Approach 2:
The patent applies preliminary correction to the gain ratios of drive and detection signals based on pre-characterized relationships between deviation angle and measurement error. By anticipating and compensating for systematic errors before they affect measurements, the system achieves high precision without requiring real-time complex computations or iterative adjustments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The gyro sensor effectively reduces measurement angle errors by correcting gain ratios and minimizing deviation angles, improving accuracy in angle and angular velocity measurements.
Implementation Method 1
a resonator having two vibration modes having different resonance angle frequencies
Implementation Method 2
a gyro sensor includes a resonator having two vibration modes having different resonance angle frequencies
Data Source
AI summary
A gyro sensor includes a resonator and a control unit that executes drive control of the resonator. The control unit includes a PLL, an AGC, a detection gain ratio corrector and a drive gain ratio corrector. The detection gain ratio corrector corrects a detection gain ratio between a gain of a first detection signal from a first detection electrode that detects vibration of the resonator on the x axis and a gain of a second detection signal from a second detection electrode that detects vibration of the resonator on the y axis. The drive gain ratio corrector corrects a drive gain ratio between a gain of a first drive signal to a first drive electrode for vibrating the resonator in the first vibration mode and a gain of a second drive signal to a second drive electrode for vibrating the resonator in the second vibration mode.