Vibratory Gyroscope Control Circuit Resonator Coriolis Axis Stability
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Solution Overview
Problem
Current vibratory gyroscopes using open-loop Coriolis signal paths and closed-loop resonator signal paths are sensitive to the quality factor (Q) of the Coriolis axis, particularly in high-Q structures, leading to instability and requiring costly calibration methods.
Innovation Solution
Implementing a gyroscope control circuit with an open-loop resonator signal path and a closed-loop Coriolis signal path, along with a Q compensation circuit to measure and adjust for variations in resonator signal path Q, ensuring robust sensitivity and stability across environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If open-loop Coriolis signal path and closed-loop resonator signal path are used, then robust sensitivity is achieved, but the system becomes sensitive to Coriolis axis quality factor variations leading to instability
Solution Approach 1:
The patent applies feedback by switching to a closed-loop Coriolis signal path where the output signal is fed back to the input, creating a negative feedback loop that automatically compensates for quality factor variations and maintains system stability while preserving sensitivity robustness
Solution Approach 2:
The patent changes the control parameter from open-loop to closed-loop configuration, allowing the system to dynamically adjust based on actual performance and maintain stability despite environmental variations affecting the Coriolis axis quality factor
2Stability of the object's composition
If resonator and Coriolis modes are intentionally split in frequency, then stable response is achieved for low-Q resonators, but quality factor reduction occurs in high-Q gyroscopes
Solution Approach 1:
The patent makes the system dynamic by allowing the Coriolis signal path to be operated in closed-loop mode, enabling adaptive response to quality factor variations without requiring fixed frequency splitting, thus maintaining both stability and high quality factor performance
Solution Approach 2:
The patent changes the operational mode of the Coriolis signal path from open-loop to closed-loop, which fundamentally alters how the system handles quality factor variations, eliminating the need for frequency splitting while maintaining stability
3Measurement precision
If calibration over temperature is performed, then sensitivity accuracy is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent enables the system to self-calibrate by using the closed-loop configuration to automatically compensate for temperature-induced variations, eliminating the need for external multi-pass ATE testing and reducing both cost and complexity while maintaining high accuracy
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 configuration enhances the robustness of vibratory gyroscopes by decoupling sensitivity from Coriolis Q, maintaining stability and accuracy without the need for expensive calibration methods, while maintaining sensitivity proportional to the resonator signal path quality factor.
Implementation Method 1
an inertial mass is driven to have some velocity along the first axis; further, the mass is typically a resonant structure and so this axis will be referred to as the Resonator axis
Implementation Method 2
Due to the Coriolis effect, when the mass is rotated with respect to an observational reference frame, there will be a Coriolis force exerted along the second axis
Data Source
AI summary
A gyroscope control circuit for a vibratory gyroscope system includes an open-loop RSP control circuit and a closed-loop CSP control circuit. The gyroscope control circuit optionally may include a Q compensation circuit to compensate for variations in gyroscope sensitivity due to variations in resonator signal path Q. The resonator signal path and the Coriolis signal path may have transduction factors that are proportional to each other such that sensitivity of the gyroscope varies directly with resonator signal path quality factor (Q).