Gyroscope Reading Circuit Resonance Signal Interference
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Solution Overview
Problem
Conventional gyroscope reading circuits face challenges in accurately removing resonance signals from Coriolis accelerometer outputs due to stray capacitance and inductance effects, leading to reduced output accuracy.
Innovation Solution
A reading circuit for a gyroscope that includes a driving unit, high pass filter, and signal processing unit, where a modulation signal is applied to the Coriolis accelerometer to modulate its output to a high frequency, allowing the high pass filter to separate and filter out the resonance signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter is used in the reading circuit to remove the resonance signal, then the resonance signal can be filtered out, but the filter cannot effectively separate the resonance signal from the angular-rate signal because they have almost the same frequency
Solution Approach 1:
The patent changes the frequency parameter of the angular-rate signal by modulating it to a higher frequency band using a modulation signal. This frequency transformation allows the resonance signal (which remains at its original lower frequency) to be effectively separated and filtered out by the low-pass filter, resolving the contradiction between measurement precision and resonance signal removal effectiveness
Solution Approach 2:
The patent introduces a modulation signal as an intermediary element that transforms the angular-rate signal to a different frequency band. This intermediary modulation signal enables the separation of the resonance signal from the angular-rate signal, allowing the low-pass filter to remove the resonance component while preserving the modulated angular-rate signal for subsequent demodulation and accurate measurement
2Measurement precision
If stray capacitance and inductance effects occur between the Coriolis accelerometer and the resonator, then coupling influence is received by the output signal, but the output accuracy is reduced due to the inability to filter the resonance signal
Solution Approach 1:
The patent applies frequency transformation by modulating the angular-rate signal to a higher frequency band. This parameter change in frequency allows the resonance signal (which maintains its original low frequency despite stray capacitance and inductance effects) to be effectively separated and removed by the low-pass filter, thereby eliminating the harmful resonance interference while preserving measurement precision
Solution Approach 2:
The patent extracts and removes the harmful resonance signal component from the output signal through frequency-based separation. By modulating the angular-rate signal to a different frequency band and using a low-pass filter, the resonance signal (including its coupling influences from stray capacitance and inductance) is extracted and eliminated, leaving only the clean modulated angular-rate signal for accurate measurement
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 resolves the interference issue, enhancing the accuracy of angular rate measurements by isolating the resonance signal noise from the Coriolis accelerometer output.
Implementation Method 1
an output terminal of the high pass filter is coupled to an input terminal of the signal processing unit. The signal processing unit is coupled to the driving unit and the high pass filter
Implementation Method 2
a modulation signal is applied to the Coriolis accelerometer to modulate its output to a high frequency, allowing the high pass filter to separate and filter out the resonance signal interference
Implementation Method 3
A Coriolis accelerometer in a conventional gyroscope outputs two signals: an angular-rate signal and a resonance signal
Data Source
AI summary
A reading circuit of a gyroscope is provided. The reading circuit includes a driving unit, a high pass filter, a signal processing unit, and a low pass filter. The driving unit generates a resonance signal for a resonator of the gyroscope and generates a demodulation signal for the signal processing unit. The signal processing unit provides a modulation signal to a Coriolis accelerometer of the gyroscope. An input terminal of the high pass filter receives an output signal of the Coriolis accelerometer. The signal processing unit processes and demodulates an output of the high pass filter according to the demodulation signal and outputs a demodulation result to the low pass filter.