Abstract
In the field of ultra high accuracy inertial measurement unit (IMU), pendulous integrating gyroscopic accelerometer (PIGA) has become a research hot spot due to its high-end performance. However, PIGA is sensitive to angular velocity, and the calibration process of PIGA-based IMU will be very complicated, which makes online self-calibration difficult to implement. To solve the above problems, we proposed an online self-calibration method utilizing angular velocity observation. The main contributions of this study are twofold: (1) An error analysis of PIGA is conducted in this paper, and the error model has also been simplified to suit the self-calibration model. (2) An improved online self-calibration method utilizing angular observation based on a simplified PIGA error model is proposed in this study. Experimental results show that the self-calibration method proposed in this study can improve the PIGA online calibration accuracy effectively (with the accuracy within 0.02 m/s/pulse), which can improve the dynamic accuracy of the PIGA.
| Original language | English |
|---|---|
| Article number | 8136 |
| Journal | Sensors |
| Volume | 22 |
| Issue number | 21 |
| DOIs | |
| State | Published - Nov 2022 |
Keywords
- angular observation
- inertial measurement unit (IMU) calibration
- pendulous integrating gyroscopic accelerometer (PIGA)
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