Electronic Bias Compensation for Vibratory Gyroscope
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Solution Overview
Problem
Current methods for compensating bias in vibratory gyroscopes, such as Coriolis vibratory gyroscopes, are inadequate as they often rely on mechanical systems that introduce additional bias and fail to achieve desired accuracy levels, especially due to temperature variations and manufacturing inconsistencies.
Innovation Solution
An electronic compensation method that generates bias measurements for various drive angles, identifies a set of equations for bias using a motion model, and solves for parameters using iterative algorithms to estimate and subtract bias from measurements, thereby improving accuracy and reducing bias within selected tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical compensation systems are used to correct bias in vibratory gyroscopes, then some level of bias correction is achieved, but additional bias is introduced and measurement accuracy deteriorates
Solution Approach 1:
The patent replaces mechanical compensation systems with an electronic/digital signal processing system. The method uses digital filtering, calibration data storage, and computational algorithms to correct bias errors, eliminating the mechanical components that introduced additional bias while achieving superior measurement accuracy through electronic means
2Manufacturing precision
If calibration is performed during manufacturing using test data, then calibration is completed, but accuracy deteriorates due to inability to account for temperature effects and time-dependent inconsistencies
Solution Approach 1:
The patent performs preliminary calibration during manufacturing to establish baseline characteristics, then uses stored calibration data in combination with real-time temperature compensation algorithms to maintain accuracy under varying conditions. The system pre-characterizes the gyroscope's behavior across different temperatures and uses this data to compensate for environmental effects during operation
Solution Approach 2:
The patent implements feedback mechanisms where temperature sensors continuously monitor environmental conditions and feed this information to signal processing algorithms that adjust measurements in real-time. This closed-loop approach compensates for temperature-induced drift and maintains calibration accuracy throughout the gyroscope's operational life
3Measurement precision
If currently available bias compensation systems are used, then some bias reduction is achieved, but the ability to reduce bias within selected tolerances is insufficient
Solution Approach 1:
The patent employs dynamic, adaptive signal processing algorithms that continuously adjust compensation parameters based on real-time measurements and environmental conditions. The system dynamically selects and applies different calibration data sets and filtering strategies to achieve bias reduction within specified tolerances across varying operational conditions, rather than using fixed static compensation
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 allows for precise electronic compensation of bias in vibratory gyroscopes, enhancing their measurement accuracy by accounting for temperature and manufacturing inconsistencies, and achieving bias reduction within specified tolerances.
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
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AI summary
A method for compensating for bias of a gyroscope. In one embodiment, bias measurements for a plurality of drive angles are generated using the gyroscope. A set of equations for the bias 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. A set of values for the set of parameters is identified using the bias measurements and the set of equations.