Gyroscope Vibration Precession for Measurement Error Cancellation
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Solution Overview
Problem
Vibrating gyroscopes used in navigation systems suffer from measurement errors due to the geometric position of vibration relative to measurement electrodes, which degrades the precision of the measurements.
Innovation Solution
A method involving a periodic control signal applied to the gyroscope to rotate its geometric position of vibration, allowing for error identification and correction by comparing the original measurement signal with the control signal, thereby canceling or averaging measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the geometric position of vibration is fixed relative to measurement electrodes, then the measurement system is simple, but measurement precision deteriorates due to position-dependent errors
Solution Approach 1:
The patent applies periodic action by rotating the geometric position of vibration periodically through controlled precession motion. The gyroscope vibrates at its resonant frequency while simultaneously precessing at a lower frequency, causing the vibration pattern to sample different spatial positions relative to the measurement electrodes. This periodic sampling allows error cancellation through averaging, improving measurement precision without requiring complex electrode arrangements.
Solution Approach 2:
The patent implements dynamics by transitioning from a static geometric position of vibration to a dynamic one. The vibration pattern is made to precess, creating a time-varying geometric position that systematically explores different spatial locations. This dynamic approach allows the system to average out position-dependent errors while maintaining a relatively simple measurement electrode configuration.
2Measurement precision
If the geometric position of vibration varies, then measurement errors are reduced, but the control system becomes more complex
Solution Approach 1:
The patent employs feedback control to maintain the desired precession motion. The control system monitors the vibration pattern and adjusts the driving forces to maintain stable precession at the intended frequency and amplitude. This feedback mechanism ensures that the geometric position of vibration varies in a controlled manner, enabling error reduction while keeping the control system complexity manageable through systematic control strategies.
3Reliability
If precession control is applied to maintain fixed geometric position, then rate measurement is achieved, but position-dependent errors still affect accuracy
Solution Approach 1:
The patent applies the inversion principle by reversing the conventional approach: instead of maintaining a fixed geometric position of vibration and measuring rate directly, the system deliberately varies the geometric position through precession and uses the variation to cancel errors. By inverting the problem-solving approach, the patent achieves both rate measurement capability and improved precision through error cancellation via averaging over multiple positions.
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 enhances the accuracy of gyroscopic measurements by reducing errors related to the geometric position of vibration, resulting in more reliable output signals for navigation systems.
Implementation Method 1
The invention relates to vibrating gyroscopes using a principle based on the Coriolis effect
Data Source
AI summary
Gyroscopic measurements are provided, by a system comprising a vibrating gyroscope, in the form of an output signal. The vibrating gyroscope provides an original measurement signal. A periodic control signal (CP) is applied to it over a time period, which signal is suitable: for rotating the geometric position of vibration in a first direction, during a part of the time period; and for rotating the geometric position of vibration in a second direction opposite to the first direction, during the other part of the time period; said control signal having a zero mean over said time period and exhibiting portions of signal at high frequency relative to the output signal; said output signal being based on a corrected signal emanating from the original measurement signal; in which the corrected signal is based on an identification of errors made during the signal portions at high frequency.