Gyroscope Phase Modulation for Quadrature Error Correction
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Solution Overview
Problem
Conventional gyroscope systems struggle with quadrature errors due to manufacturing misalignments and environmental drifts, which affect accuracy and stability, particularly in real-world conditions, and existing compensation methods are inefficient in handling these dynamic changes.
Innovation Solution
A gyroscope system that employs a phase modulation signal to introduce a frequency component proportional to the quadrature amplitude, allowing real-time estimation and compensation of quadrature errors through a feedback loop, reducing the need for separate demodulation chains and minimizing processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional demodulation methods are used without phase modulation, then the demodulation process is simpler, but quadrature error compensation accuracy deteriorates
Solution Approach 1:
A phase modulation signal is introduced as an intermediary carrier that transports quadrature error information to the demodulated output. This mediator enables accurate quadrature error measurement without requiring complex separate demodulation chains, as the phase modulation signal acts as a vehicle to convey the error information through the existing demodulation path.
Solution Approach 2:
The system changes the parameter of the demodulated signal by introducing a phase modulation component. This parameter change allows the quadrature error information, which would otherwise be inaccessible or difficult to extract, to appear as a measurable frequency component in the demodulated output, thereby improving measurement precision while using standard demodulation hardware.
2Measurement precision
If separate demodulation chains are used for quadrature error compensation, then compensation accuracy improves, but system complexity and power consumption increase
Solution Approach 1:
The phase modulation signal serves multiple functions simultaneously: it enables quadrature error information transfer, maintains compatibility with existing demodulation hardware, and allows real-time error compensation without requiring separate dedicated demodulation chains. This multi-functionality reduces overall system power consumption while maintaining compensation accuracy.
Solution Approach 2:
The invention merges the quadrature error compensation function with the existing signal demodulation path by using phase modulation. Instead of maintaining separate parallel demodulation chains, the quadrature error information is combined into the main demodulation output through phase modulation, allowing both functions to share the same hardware resources and reduce power consumption.
3Adaptability or versatility
If static compensation parameters are used, then system stability is improved, but adaptability to environmental changes deteriorates
Solution Approach 1:
The system uses feedback by continuously monitoring the phase modulation signal in the demodulated output and adjusting compensation parameters in real-time. This feedback mechanism allows the system to adapt to environmental changes such as temperature drift while maintaining stability through continuous correction, rather than relying on static pre-calibrated parameters.
Solution Approach 2:
The compensation system transitions from static to dynamic operation by using phase modulation to enable real-time tracking of quadrature errors. The phase modulation signal allows the system to dynamically adjust compensation parameters according to current operating conditions, improving adaptability to environmental changes while maintaining system stability through continuous adjustment.
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 provides dynamic and efficient quadrature compensation, improving accuracy and stability by estimating quadrature amplitude and phase errors in real-time, reducing system complexity and power consumption, and adapting to varying conditions without interruptions.
Implementation Method 1
Gyroscopes generate an output signal which typically includes a Coriolis component and a quadrature component. The Coriolis component is the angular rate motion component of the gyroscope output
Data Source
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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.