Vibrating Structure Gyroscope Phase Modulation Drive Signal
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Solution Overview
Problem
Vibrating structure gyroscopes experience rate output errors due to non-linearities in device components, necessitating a solution to reduce these errors in measured angular rate.
Innovation Solution
The implementation of a vibrating structure gyroscope that includes phase modulation of the drive signal by controllers to adjust and correct errors caused by non-linearities in drive circuits, potentially eliminating the need for a digital-to-analogue converter, and utilizing a two-level digital drive signal to simplify electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional drive circuits are used in vibrating structure gyroscopes, then the device can operate, but measurement errors occur due to non-linearities in the drive circuits
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional analog drive circuits to digital phase-modulated drive signals. The drive signal parameters are changed from continuous analog values to discrete digital levels with phase modulation, which fundamentally alters how the structure is driven and eliminates analog non-linearity errors in the measurement process
Solution Approach 2:
The patent substitutes the mechanical/analog drive circuit system with a digital control system. Instead of using analog electronics to drive the vibrating structure, the invention uses digital signal generation with phase modulation to control the drive transducers, replacing the analog mechanical drive system with a digital equivalent that is free from analog non-linearity errors
2Ease of operation
If analog drive circuits with digital-to-analogue converters are used, then continuous drive signals can be provided, but device complexity increases
Solution Approach 1:
The patent replaces the analog electronics system including digital-to-analogue converters with a digital signal generation system. The drive signal is generated directly in digital form using phase modulation techniques, eliminating the need for DACs and associated analog circuitry while maintaining the capability to provide continuous drive signals to the vibrating structure
Solution Approach 2:
The patent extracts and removes the digital-to-analogue converter from the drive circuit architecture. By taking out the DAC component and replacing it with direct digital signal generation using phase modulation, the invention simplifies the electronics while retaining the essential function of providing continuous drive signals to the gyroscope structure
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 measurement errors by phase correcting the drive and pick-off signals, improving the accuracy of angular rate measurements and simplifying the electronics required for the gyroscope.
Implementation Method 1
one or more drive transducers configured to oscillate the structure at a resonant frequency
Implementation Method 2
one or more pick off transducers configured to detect oscillation of the structure
Data Source
Figure 1~2
AI summary
A vibrating structure gyroscope comprises: a structure configured to vibrate; one or more drive transducers configured to oscillate the structure at a resonant frequency or dampen oscillation of the structure; one or more drive circuits configured to activate the one or more drive transducers; one or more pick off transducers configured to detect oscillation of the structure; one or more pick off circuits configured to output a pick off circuit signal based on the detected oscillations; and one or more controllers configured to adjust a drive signal for the one or more drive transducers based on the one or more pick off circuit signals; wherein the one or more controllers are configured to phase modulate the adjusted drive signal.