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An In-Run Automatic Demodulation Phase Error Compensation Method for MEMS Gyroscope in Full Temperature Range.

Jianpeng Wang1,2, Gongliu Yang1,3, Yi Zhou4

  • 1School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing 100191, China.

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|July 27, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an in-run automatic compensation method to fix demodulation phase errors in MEMS gyroscopes. The technique significantly reduces bias instability across a wide temperature range, improving gyroscope performance.

Keywords:
MEMS gyroscopebias instabilitydemodulation phase errorfull temperatureidentification and compensationin-run

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Area of Science:

  • * Mechanical Engineering
  • * Electrical Engineering
  • * Sensor Technology

Background:

  • * Demodulation phase error in Micro-Electro-Mechanical Systems (MEMS) gyroscopes couples quadrature error to the rate output, degrading performance.
  • * This error is a critical factor limiting the accuracy and reliability of MEMS gyroscope applications.

Purpose of the Study:

  • * To propose and validate an in-run automatic demodulation phase error compensation method for MEMS gyroscopes.
  • * To improve the performance and accuracy of MEMS gyroscopes by mitigating phase error effects.

Main Methods:

  • * An automatic identification algorithm using square wave angular rate input to detect demodulation phase error.
  • * In-run compensation by measuring phase error across a -40~60 °C temperature range at 10 °C intervals.
  • * Fitting the temperature-dependent phase error using a third-order polynomial and implementing compensation based on sensor temperature readings.

Main Results:

  • * Elimination of temperature hysteresis effects on the gyroscope's zero-rate output (ZRO).
  • * Reduction of bias instability (BI) by four to eight times at room temperature (25 °C) to 0.1°/h.
  • * Reduction of BI by three to four times in the full-temperature environment (-40~60 °C) to 0.1°/h.

Conclusions:

  • * The proposed in-run automatic compensation method effectively mitigates demodulation phase errors in MEMS gyroscopes.
  • * The method significantly enhances gyroscope performance, particularly bias instability, across a wide operational temperature range.
  • * This advancement contributes to more reliable and accurate MEMS gyroscope systems in demanding environments.