A Novel Tri-Axial MEMS Gyroscope Calibration Method over a Full Temperature Range

Area of Science:

• Navigation Systems
• Sensor Technology
• Metrology

Background:

• Micro-electro-mechanical inertial measurement units (MEMS-IMUs) are crucial for mid-low navigation due to their low cost, small size, light weight, and low power consumption (CSWap).
• MEMS-IMU performance, particularly gyroscopes, degrades significantly with temperature fluctuations, impacting navigation accuracy.
• Existing calibration methods may be insufficient for full temperature range compensation.

Purpose of the Study:

• To develop an optimized error calibration method for tri-axial MEMS gyroscopes that functions effectively across a full temperature range.
• To enhance the utilization of navigation accuracy from MEMS-IMUs in dynamic temperature environments.
• To provide a robust and efficient calibration solution for engineering applications.

Main Methods:

• Establishment of a comprehensive calibration error model, including package misalignment, sensor non-orthogonality, scale factor, and bias errors.
• Implementation of a three-position positive/reversed test using a single-axis temperature-controlled turntable at multiple reference temperatures.
• Utilization of the least squares method to derive an error compensation vector and establish an error matrix.

Main Results:

• Successful derivation of an error compensation vector using the least squares method and an error matrix.
• Demonstration that error compensation vectors at any known temperature can be calculated via Lagrange interpolation.
• Effective compensation of tri-axial MEMS gyroscope outputs, eliminating the need for recalibration across temperature changes.

Conclusions:

• The proposed optimized error calibration method is effective and feasible for engineering applications.
• Lagrange interpolation enables accurate error compensation vector calculation at specific temperatures, simplifying application.
• The method significantly improves MEMS gyroscope performance and navigation accuracy over a full temperature range.