Gyroscope Velocity Measurement for Rotation Accuracy
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Solution Overview
Problem
Vibratory gyroscopes face reduced accuracy due to variations in drive velocity caused by factors like spring degradation, temperature fluctuations, and electronic changes, which are not accounted for in systems that do not consider drift, leading to measurement inaccuracies in rotation rates.
Innovation Solution
A gyroscope system that includes a drive frame oscillating with respect to a first axis, a sense mass measuring displacement along a second axis orthogonal to the first, and measurement circuitry to determine velocity and extract the Coriolis component, allowing for accurate rotation rate calculation by accounting for quadrature and inertial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drive velocity variations are not compensated for, then the system remains simple, but measurement precision of rotation rate deteriorates
Solution Approach 1:
The patent introduces an intermediary velocity measurement system that measures drive frame velocity independently. This intermediary measurement allows the system to compensate for drive velocity variations without fundamentally changing the core gyroscope operation, thereby improving rotation rate measurement precision while adding only moderate complexity through separate velocity sensing and processing circuitry.
Solution Approach 2:
The patent implements feedback by using the measured velocity signal to adjust and compensate for drive velocity variations in real-time. The velocity measurement feeds back into the signal processing chain, allowing dynamic correction of the rotation rate calculation to account for drive velocity drift, thus maintaining high measurement precision.
2Reliability
If drive velocity drift is not accounted for, then the system operates simply, but reliability of rotation measurement deteriorates
Solution Approach 1:
The system performs self-service by using its own measured velocity data to compensate for its own measurement errors. The gyroscope system measures its drive frame velocity and uses this information to correct its rotation rate measurements, making the system self-correcting and more reliable without requiring external calibration or complex additional sensors.
Solution Approach 2:
The patent implements feedback by using the measured velocity signal to adjust and compensate for drive velocity variations in real-time. The velocity measurement feeds back into the signal processing chain, allowing dynamic correction of the rotation rate calculation to account for drive velocity drift, thus maintaining high measurement precision.
3Measurement precision
If velocity measurement and correction systems are added, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the velocity measurement system to serve multiple purposes: it measures drive frame velocity for compensation, characterizes drive mode motion, and provides data for signal processing corrections. This universal approach allows a single velocity measurement subsystem to address multiple measurement challenges, improving precision without proportionally increasing complexity.
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 system effectively determines rotation rates with improved accuracy by decoupling rotation rate from drive velocity perturbations, enhancing measurement precision despite environmental and operational variations.
Implementation Method 1
a drive structure configured for causing a drive frame to oscillate with respect to a first axis
Implementation Method 2
a sense mass sense structure configured for measuring a displacement of the sense mass along a second axis orthogonal to the first axis
Implementation Method 3
A Coriolis component of the motion of the moving proof mass is caused by a Coriolis force. The Coriolis force exists only when the gyroscope experiences an external rotation
Data Source
AI summary
Systems and methods are disclosed herein for determining rotation. A gyroscope includes a drive frame and a base, the drive frame springedly coupled to the base. The gyroscope includes a drive structure configured for causing a drive frame to oscillate along a first axis. The gyroscope includes a sense mass springedly coupled to the drive frame. The gyroscope includes a sense mass sense structure configured for measuring a displacement of the sense mass along a second axis orthogonal to the first axis. The gyroscope includes measurement circuitry configured for determining a velocity of the drive frame, extracting a Coriolis component from the measured displacement, and determining, based on the determined velocity and extracted Coriolis component, a rotation rate of the gyroscope.