Gyroscope Phase-Modulated Demodulation for Quadrature Error Correction
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Solution Overview
Problem
Conventional gyroscope systems struggle with quadrature component inaccuracies due to manufacturing misalignments and environmental drifts, which affect the accuracy of rotational signal measurements and bias stability.
Innovation Solution
A gyroscope system that employs a phase modulation signal in the demodulation process to introduce a frequency component proportional to the quadrature amplitude, allowing real-time estimation and compensation for quadrature errors using a feedback loop, reducing the need for separate quadrature demodulation chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gyroscope systems use separate quadrature demodulation chains to compensate for quadrature errors, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the quadrature error compensation function into the existing in-phase demodulation path by injecting a phase modulation signal. This merging eliminates the need for separate quadrature demodulation chains while maintaining measurement accuracy, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The in-phase demodulation signal is given a dual function: it simultaneously performs standard signal demodulation and quadrature error estimation by incorporating a phase modulation component. This multi-functionality allows one circuit to replace what would traditionally require separate dedicated quadrature processing chains
2Reliability
If phase modulation signals are injected into the demodulation path for quadrature estimation, then real-time compensation is achieved, but signal processing complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the phase modulation signal is injected into the demodulation path, the resulting frequency component is detected in the demodulated output, and this information is used to generate feedback signals that compensate for quadrature errors in real-time, improving reliability through continuous error correction
Solution Approach 2:
The patent changes the parameter space by modulating the phase of the demodulation signal at a specific frequency. This parameter change (phase modulation) transforms the quadrature error information into a detectable frequency domain signature, enabling real-time estimation without requiring complex time-domain processing
3Device complexity
If manufacturing misalignments and environmental drifts are not compensated, then device complexity is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The gyroscope system performs self-diagnosis and self-correction by using its own demodulation path to detect quadrature errors caused by manufacturing misalignments and environmental drifts. The phase modulation technique enables the system to self-estimate these errors and generate compensation signals without requiring external calibration equipment or complex additional sensors
Data Source
AI summary
A method includes generating a signal using a gyroscope. The generated signal includes a Coriolis component and a quadrature component. The signal generated by the gyroscope is demodulated using a feedback loop, generating a demodulated signal. The demodulating includes generating an in-phase demodulation signal and demodulating the signal generated by the gyroscope using the generated in-phase demodulation signal. The in-phase demodulation signal includes a phase-modulation signal and the demodulated signal includes a frequency component corresponding to the phase-modulation signal. An amplitude of the frequency component corresponding to the phase-modulation signal in the demodulated signal is estimated, and a feedback signal is generated based on the estimated amplitude of the frequency component corresponding to the phase-modulation signal. Compensation for the quadrature component of the signal generated by the gyroscope is applied based on the feedback signal. An output signal is generated based on the demodulated signal.