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    AI Overview
    High-quality Fiber Optic Gyro (FOG) IMU calibration
    ensures maximum navigation accuracy by determining precise, deterministic sensor errors using specialized, multi-axis turntables and modeling non-orthogonal/misalignment errors . Techniques like 5RILP (5-rotation-in-level-plane) or 3-axis rotation paths (10–50°/s) over several minutes, followed by Kalman filtering, are employed.
    Key Aspects of High-Quality FOG IMU Calibration
    • Turntable Protocols: Using high-precision, multi-axis turntables is essential. A 5-rotation-in-level-plane (5RILP) method involves placing the IMU in six positions on a level plane without "standing-up" actions, recording data for ~1 min at each position to identify 12+ error parameters.
    • Optimal Rotation Path: To fully motivate system parameter errors, a rotational path covering three axes is used, often alternating between different rotation rates (e.g., 10°/s, 30°/s, 50°/s) to capture rate-dependent errors.
    • Modeling Techniques: Calibration goes beyond simple bias removal to include:
      • Non-orthogonal Angles : Correcting for axes not being perfectly orthogonal.
      • Misalignment Errors : Correcting the orientation between the IMU and the navigation frame.
      • Scale Factor Errors : Correcting the sensor's sensitivity.
    • Hybrid Calibration Methods: Combining coarse calibration (sensor-level) with high-precision, 27-dimension Kalman filter estimation of residual errors improves accuracy.
    • Environmental Considerations: High-quality calibration often accounts for temperature-sensitive biases and leverages Allan variance analysis for non-deterministic error quantification.
    Calibration Process Flow
    1. Mounting: Secure the FOG-IMU onto a 3-axis turntable, ensuring precise alignment.
    2. Initial Stationary Period: Perform an initial alignment to establish the baseline for about 1–5 minutes.
    3. Rotation Sequences: Execute a predefined rotation path (e.g., rotating X, Y, and Z axes sequentially).
    4. Data Collection: Record accelerometer and gyro data throughout the rotations.
    5. Parameter Calculation: Apply a Kalman filter or least-squares method to estimate the 12+ error coefficients (bias, scale factor, and non-orthogonality).
    6. Compensation: Apply the calibration parameters to the raw data.
    • A time asynchronous parameters calibration method of high ...
      Feb 16, 2023 — Figure 2. * (a) The initial alignment of the system and the factory calibration of the basic parameters have been completed. First...
      IOPscience
    • SBG-A-direct-approach-for-high-quality-MEMS-based-IMU ...
      Calibration is one of the most critical topics in IMU and INS production workflow. This process increases significantly IMU accura...
      SBG Systems
    • In-field fast calibration of FOG-based MWD IMU for horizontal drilling
      Jan 23, 2015 — Only the main 12 errors for horizontal drilling are expected. To meet the above requirements, a five-rotation-in-level-plane (5RIL...
      IOPscience
    • A novel hybrid calibration method for FOG-based IMU - ScienceDirect
      The design principle is to get a suitable rotating path of the turntable, so that the system parameter errors can be fully motivat...
      ScienceDirect.com
    • Research on IMU Calibration Model Based on Polar Decomposition
      Mar 21, 2023 — The analysis results show that the misalignment error is larger than the nonorthogonal error. This result is helpful to improve th...
      MDPI
    • Fast calibration of a 9-DOF IMU using a 3 DOF position tracker and a ...
      Aug 15, 2016 — A novel hybrid calibration method for FOG-based IMU ... In view of these problems, this paper proposes a high precision FOG hybrid...
      ScienceDirect.com
    • UAV Navigation High Quality Calibration
      Jan 15, 2019 — Calibration affects many different sensor types: accelerometer, gyroscope, magnetometer and air data sensors. Most sensor types ca...
      UAV Navigation
    • A Novel Co-Calibration Method for a Dual Heterogeneous ...
      Oct 12, 2023 — The IMU frame adopts right-hand coordination, and the x, y, and z axes are defined as the right, forward, and upward directions. T...
      The Institute of Navigation
    • Highly reliable FOG IMU: Accurate navigation, decisive tactical ...
      Feb 12, 2025 — ✅ Military-grade reliability: all-solid three-axis fiber optic gyroscope (FOG) and three-axis quartz flexible accelerometer, no mo...
      Ericco Inertial Technology
    • A time asynchronous parameters calibration method of high ...
      Feb 16, 2023 — Figure 2. * (a) The initial alignment of the system and the factory calibration of the basic parameters have been completed. First...
      IOPscience
    • SBG-A-direct-approach-for-high-quality-MEMS-based-IMU ...
      Calibration is one of the most critical topics in IMU and INS production workflow. This process increases significantly IMU accura...
      SBG Systems
    • In-field fast calibration of FOG-based MWD IMU for horizontal drilling
      Jan 23, 2015 — Only the main 12 errors for horizontal drilling are expected. To meet the above requirements, a five-rotation-in-level-plane (5RIL...
      IOPscience
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    A time asynchronous parameters calibration method ...


    IOPscience
    https://iopscience.iop.org › article
    IOPscience
    https://iopscience.iop.org › article
    by J Chang · 2023 · Cited by 6 — Firstly, the high-precision FOG-IMU is positioned at the initial position, and it is rotated around the Y-axis merely. Read more

    UmiX Series Inertial Measurement Unit (IMU) - Exail


    exail.com
    https://www.exail.com › product-range › inertial-measu...
    exail.com
    https://www.exail.com › product-range › inertial-measu...
    High-performance Inertial Measurement Unit with cutting-edge north-seeking FOG capabilities to ensure exceptional stability in harsh environments.

    UAV Navigation High Quality Calibration


    UAV Navigation
    https://www.uavnavigation.com › company › blog › uav...
    UAV Navigation
    https://www.uavnavigation.com › company › blog › uav...
    The quality of our AHRS/IMU unit has been tested against a FOG unit with excellent results. Gyroscopes ('gyros') have a considerable impact on the overall ... Read more

    IMU & AHRS | Inertial Navigation Systems


    Advanced Navigation
    https://www.advancednavigation.com › imu-ahrs
    Advanced Navigation
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    Advanced Navigation is a leading manufacturer of high-accuracy MEMS and FOG inertial measurement units (IMU ) and attitude and heading reference systems (AHRS). Read more

    Seeking FOG validation for a deterministic 357s IMU ...


    Reddit · r/labrats
    1 comment · 21 hours ago
    Reddit · r/labrats
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    ​I need to rule out OS-level calibration or MEMS-specific noise. Is anyone with access to a Fiber Optic Gyroscope ( FOG ) or high - end industrial ... Read more

    A Novel Co-Calibration Method for a Dual Heterogeneous ...


    The Institute of Navigation
    https://navi.ion.org › content › navi
    The Institute of Navigation
    https://navi.ion.org › content › navi
    by J Cui · 2023 · Cited by 6 — A novel co- calibration method is proposed to estimate the FOG scale factor instability and RLG bias instability error in real time. Read more

    Highly reliable FOG IMU: Accurate navigation, decisive ...


    Ericco Inertial Technology
    https://www.ericcointernational.com › news › highly-rel...
    Ericco Inertial Technology
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    Feb 12, 2025 — ER-FIMU-40 FOG IMU , tailored for demanding tactical systems, with military-grade reliability, extreme accuracy and rapid response.
    5.0 (820)

    Top 10 FOG Inertial Measurement Unit (IMU) Suppliers in ...


    GuideNav
    https://guidenav.com › blog › top-10-fog-inertial-meas...
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    Discover the top 10 fiber optic IMU suppliers in 2025, including Honeywell, Exail, GuideNav, and more. Compare bias drift, export control, and tactical ...
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    JOUAV
    https://www.jouav.com › blog › inertial-measurement-u...
    JOUAV
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    Apr 17, 2025 — Calibrate the IMU sensors to compensate for any manufacturing imperfections or environmental influences. This typically involves performing a ... Read more

    A direct approach for high-quality MEMS based IMU/INS ...


    SBG Systems
    https://www.sbg-systems.com › uploads › SBG-A...
    SBG Systems
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    PDF
    by L Poletti · Cited by 4 — The production process starts with the assembling of raw material to get IMUs. Then, each. IMU is calibrated on a temperature controlled double axes rate table . Read more
    19 pages
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