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Fiber Optic Gyroscope Inertial Measurement Unit (FOG IMU) calibration involves using high-precision rate tables to determine bias, scale factors, and non-orthogonality, ensuring accuracy against thermal and dynamic errors. Key techniques include multi-position static tests, positive/negative rate rotation (e.g.,
), and temperature-controlled modeling.
Key FOG IMU Calibration Procedures
- Static Calibration (Zero Offset): The IMU is placed on a stable, horizontal, temperature-controlled platform. Data is recorded over time to calculate the average bias for each gyroscope and accelerometer axis.
- Rate Table Calibration (Scale Factor/Linearity): Using a precision turntable, the IMU is rotated at specific positive and negative rates (often ) to determine the scale factor (sensitivity) and linearity of the sensors.
- Multi-Position Calibration (Orthogonality): The IMU is placed in multiple orientations (e.g., 6, 12, or 24 positions) to align the sensitive axes with Earth’s gravity and rotation, helping to solve for axes non-orthogonality.
- Temperature Calibration: Because FOGs are sensitive to thermal changes, calibration is performed across a wide temperature range to build a temperature-compensation model, as detailed in this Ericco Inertial Technology article and discussed in this IEEE study.
Testing and Validation Procedures
- Rotation-Modulation Test: Involves continuous, synchronized rotation of the IMU to allow for real-time error observation and compensation (e.g., via a 3-axis turntable).
- System Identification/Kalman Filtering: Data collected during testing is processed using Kalman filters to estimate and compensate for, or correct, 12 or more key error sources.
- Performance Evaluation: Following calibration, the unit is tested to ensure it meets specifications for bias stability and angular rate accuracy.
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Web results
Measurement Error and Calibration of FOG IMU
Medium · Ericco Inertial Technology
2 years ago
Medium · Ericco Inertial Technology
2 years ago
Traditional IMU calibration methods include static multi-position calibration under normal temperature environment, angular rate calibration and ...Read more
Missing: Testing Procedures
Improving the calibration process of inertial measurement ...
The Institute of Navigation
https://navi.ion.org › content
The Institute of Navigation
https://navi.ion.org › content
by H Rahimi2020Cited by 7 — To calibrate an IMU, five steps must be taken, shown in Figure 1. In the first step, the mathematical model of the sensor output (generally, the IMU) is ...Read more
When Should You Recalibrate or Replace a FOG IMU?
GuideNav
https://guidenav.com › blog › when-should-you-recalib...
GuideNav
https://guidenav.com › blog › when-should-you-recalib...
How Is FOG IMU Recalibration Performed? · Static Bias Testing · Temperature Cycling · Rotation Table Calibration · Cross-Axis Alignment Check · System Verification.Read more
A hybrid grading calibration method of FOG-IMU and its ...
IEEE
https://ieeexplore.ieee.org › document
IEEE
https://ieeexplore.ieee.org › document
by J Chang2017 — A hybrid grading calibration method of FOG-IMU and its experimental verification. Abstract: There exist some problems in the fiber optic gyro inertial ...Read more
Missing: Testing Procedures
IMU calibration method and calibration process
Ericco Inertial Technology
https://www.ericcointernational.com › application › imu...
Ericco Inertial Technology
https://www.ericcointernational.com › application › imu...
Apr 10, 2024 — The calibration methods of IMU are mainly divided into two categories: static calibration and dynamic calibration. Static calibration is mainly ...Read more
Full temperature range high-precision calibration
memsmag.com
https://www.memsmag.com › full-temperature-range-hig...
memsmag.com
https://www.memsmag.com › full-temperature-range-hig...
Apr 17, 2025 — Explore high-precision calibration for FOG IMU (Fiber Optic Gyro Inertial Measurement Unit) across full temperature ranges.
A novel hybrid calibration method for FOG-based IMU
ScienceDirect.com
https://www.sciencedirect.com › article › abs › pii
ScienceDirect.com
https://www.sciencedirect.com › article › abs › pii
by B Xu2019Cited by 23 — Combination method of coarse and accurate calibration is used to realize high precision calibration of FOG-IMU sensors. First of all, the system parameters ...Read more
Systematic Calibration Method for FOG Inertial ...
Scientific.net
https://www.scientific.net › AMR.662.717
Scientific.net
https://www.scientific.net › AMR.662.717
by ZY Zheng2013Cited by 6 — The paper presents a one-time systematic IMU calibration method only using two-axis low precision turntable. First, the detail error model of inertial sensors ...Read more
Missing: Testing Procedures
A Complete Guide to Inertial Measurement Unit (IMU)
JOUAV
https://www.jouav.com › blog › inertial-measurement-u...
JOUAV
https://www.jouav.com › blog › inertial-measurement-u...
Apr 17, 2025 — Calibrating an IMU involves a series of steps to ensure accurate and reliable sensor readings. Begin by placing the IMU on a stable surface to ...Read more
Division for assembling and calibration of FOGs, IMU and INS
Fiber Optical Solutions
https://opticalsolution.lv › division-for-assembling-and-...
Fiber Optical Solutions
https://opticalsolution.lv › division-for-assembling-and-...
Division for assembling and calibration of FOGs, IMU and INS. Equipment: Single- and three-axis FOG developed by “Fiber Optical Solution” consist of a light ...Read more
Scholarly articles for FOG IMU Calibration and Testing Procedures | |
A novel hybrid calibration method for FOG-based IMU - Xu - Cited by 24 A new calibration method of MEMS IMU plus FOG IMU - Lu - Cited by 38 In-field fast calibration of FOG-based MWD IMU for … - Li - Cited by 27 | |