Electronic Bias Compensation for Vibratory Gyroscope
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Solution Overview
Problem
Current methods for compensating bias in vibratory gyroscopes are inadequate, as they often rely on mechanical systems that introduce additional bias and fail to accurately estimate the inertial rate and bias within desired tolerances, especially when temperature and manufacturing inconsistencies are considered.
Innovation Solution
A method and apparatus that electronically compensates for bias in gyroscopes by identifying a set of equations using a motion model, which includes parameters for bias, and simultaneously determines the inertial rate and bias values through measurements at multiple drive angles, allowing for real-time calibration and compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical systems are used for bias compensation, then the gyroscope can be calibrated during manufacturing, but the bias cannot be reduced to within selected tolerances due to additional mechanical bias introduced
Solution Approach 1:
The patent replaces mechanical bias compensation systems with an electronic/digital system. The compensation system uses digital signal processing to identify and compensate for bias in the gyroscope measurements, thereby eliminating the additional mechanical bias that would be introduced by mechanical compensation mechanisms.
Solution Approach 2:
The compensation system is configured to automatically identify and compensate for bias in real-time during operation. The system uses measurements from the gyroscope to determine bias parameters and applies compensation without external intervention, enabling the system to self-correct its measurements.
2Ease of manufacture
If calibration is performed during manufacturing using test data, then the process is simple, but the calibration accuracy is insufficient compared to real-time data
Solution Approach 1:
The patent enables bias compensation parameters to be determined during manufacturing through automated testing procedures. The compensation system can be pre-configured with initial bias parameters obtained from factory testing, allowing the gyroscope to operate with compensated measurements from the outset while maintaining the ability to update parameters during field operation.
Solution Approach 2:
The compensation system continuously monitors gyroscope measurements and uses feedback to refine bias parameter estimates. By comparing expected measurements with actual measurements and adjusting parameters accordingly, the system achieves high calibration accuracy that surpasses traditional manufacturing calibration methods.
3Device complexity
If traditional bias compensation methods are used, then the system structure remains simple, but the inertial rate and bias cannot be simultaneously determined within desired tolerances
Solution Approach 1:
The patent separates the determination of inertial rate and bias into distinct computational steps within the compensation system. The system first identifies bias parameters from measurements taken at different drive angles, then uses these parameters to calculate the inertial rate, thereby achieving accurate simultaneous determination through structured signal processing.
Solution Approach 2:
The patent operates the gyroscope at multiple drive angles to gather measurements from different operational dimensions. By analyzing measurements across this additional dimension of drive angle variation, the compensation system can independently determine both bias parameters and inertial rate with high accuracy, resolving the trade-off between system complexity and measurement precision.
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
This approach effectively reduces bias in gyroscope measurements to within selected tolerances, improving accuracy and reliability by accounting for temperature and manufacturing inconsistencies, and enabling self-calibration both before and during service.
Implementation Method 1
Vibration along the first axis while the Coriolis vibratory gyroscope is being rotated about a fixed input axis generates a Coriolis force that induces vibrations along a second axis.
Data Source
AI summary
A method for simultaneously identifying an inertial rate of a gyroscope and a bias for a gyroscope. A set of equations for an output of the gyroscope is identified using a model for motion of the gyroscope. The set of equations includes a set of parameters for the bias of the gyroscope. The inertial rate of the gyroscope and a set of values for the set of parameters for the bias of the gyroscope are identified using the set of equations and measurements generated by the gyroscope for a plurality of drive angles.