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    AI Overview

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    AI Overview
    Fiber optic gyroscope (FOG) calibration involves determining error parameters—bias, scale factor, and misalignment—to ensure precise navigation. Key methods include
    static testing using Earth’s rotation, multi-position turntable rotations (e.g., 19-position, 10-rotation), and Kalman filtering to estimate errors, often integrating accelerometers to correct inertial measurement unit (IMU) data .
    Key Calibration Methods and Techniques
    • Static Discrete Calibration : Utilizes the Earth's rotation and a high-precision, multi-axis turntable to determine the scale factor, bias, and installation errors.
    • Systematic/Multi-position Calibration : FOG raw data is collected across 19 or more specific positions, followed by software algorithms to estimate parameters, which works for both field and factory settings.
    • Self-Calibration Algorithm : A method that estimates and separates misalignment angles between the gyroscope and the rotating gimbal axis to improve navigation, particularly useful for single-axis, rotational inertial navigation systems.
    • Neural Network Compensation : Advanced methods, such as Grey Wolf Optimization (GWO) and Gated Recurrent Unit (GRU) neural networks, are used to compensate for non-linear scale factor errors during start-up.
    • Temperature Compensation : Because FOGs are sensitive to temperature, calibrating in a controlled environment to establish a temperature-bias model is essential for accuracy.
    Calibration Parameters
    The goal of these methods is to determine:
    1. Zero Bias (Offset): The output when the rotation rate is zero.
    2. Scale Factor: The relationship between input angular rate and output voltage/data.
    3. Misalignment Angle: The deviation of the sensitive axis from the intended inertial axis.
    Typical Calibration Workflow
    1. Setup: Install the FOG on a three-axis precision turntable.
    2. Data Acquisition: Rotate the device through a specified sequence, collecting data at different positions.
    3. Modeling: Apply Kalman filters or least-squares estimation to the collected data to identify errors.
    4. Compensation: Apply the calculated correction factors to the FOG output.
    • Calibration Method of Angular Velocity Sensor for Single-axis ...
      Jul 20, 2023 — The attitude system is composed of three fiber optic gyroscopes, and the error of a single fiber optic gyroscope is also the objec...
      Ericco Inertial Technology
    • Research on calibration of fiber optic gyro units - IEEE Xplore
      Abstract: In order to satisfy the calibration precision of fiber optic gyro units used in the strap-down inertial navigation syste...
      IEEE
    • Systematic calibration method based on acceleration and angular ...
      Jan 5, 2021 — A simple systematic calibration method based on acceleration and angular rate measurements is introduced for the fiber-optic gyro ...
      AIP Publishing
    • Calibration method for misalignment angles of a fiber optic ...
      Feb 14, 2022 — Abstract. In a fiber optic gyroscope rotational inertial navigation system (RINS), attitude errors may change after vibration due ...
      Optica Publishing Group
    • A Fast and Non-Directional Calibration Method for Fiber Optic ...
      A Fast and Non-Directional Calibration Method for Fiber Optic Gyro Inertial Navigation System. Abstract: The laboratory three-axis...
      IEEE Xplore
    • A calibration technique for a fiber optic gyro strapdown inertial ...
      Oct 30, 2006 — A calibration technique for a fiber optic gyro strapdown inertial navigation system. ... The error model of Fiber Optic Gyro Syste...
      SPIE Digital Library
    • Study on nonlinear error calibration of fiber optical gyroscope scale ...
      Feb 28, 2022 — The scale factor is one of the critical parameters to characterize the dynamic performance of the FOG. Due to the temperature sens...
      ScienceDirect.com
    • Fiber Optic Gyroscope Glossary
      SCALE FACTOR (SF) If the gyro is exposed to rotation its output voltage changes. SF is defined as a coefficient between the voltag...
      mostatech.mt
    • High-precision angular rate detection based on an optomechanical micro hemispherical shell resonator gyroscope
      Mar 30, 2023 — The scale factor is the linear correlation coefficient between the output voltage V out and the input angular rate Ω of the MHSRG.
      Optica Publishing Group
    • Camera Calibration in High-Speed Robotic Assembly Operations
      Sep 26, 2024 — Then, the information regarding these angles was extracted from each camera. Using the estimated angles, the adjustment angles wer...
      MDPI
    • Calibration Method of Angular Velocity Sensor for Single-axis ...
      Jul 20, 2023 — The attitude system is composed of three fiber optic gyroscopes, and the error of a single fiber optic gyroscope is also the objec...
      Ericco Inertial Technology
    • Research on calibration of fiber optic gyro units - IEEE Xplore
      Abstract: In order to satisfy the calibration precision of fiber optic gyro units used in the strap-down inertial navigation syste...
      IEEE
    • Systematic calibration method based on acceleration and angular ...
      Jan 5, 2021 — A simple systematic calibration method based on acceleration and angular rate measurements is introduced for the fiber-optic gyro ...
      AIP Publishing
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    Calibration method for misalignment angles of a fiber optic ...


    Optica Publishing Group
    https://opg.optica.org › abstract
    Optica Publishing Group
    https://opg.optica.org › abstract
    by J Ban · 2022 · Cited by 8 — This paper proposes a calibration method based on fine alignment algorithm to calibrate the gyroscopes' misalignment angles. Its accuracy is proven by ... Read more

    How is the Calibration Process Performed for a Single Axis ...


    SkyMEMS
    https://www.skymems.com › Industry News
    SkyMEMS
    https://www.skymems.com › Industry News
    In this article, we will discuss the calibration process for single axis fiber optic gyroscopes (SAFOGs), which are commonly used in aerospace and defense ... Read more
    Missing: method ‎| Show results with: method

    Method and system for calibrating a fiber optic gyroscope


    Google Patents
    https://patents.google.com › patent
    Google Patents
    https://patents.google.com › patent
    It should be noted that the interruption during calibration can be eliminated by further modulating the light from the light source and/or the reference light ... Read more

    How is the Calibration Process Performed for a Single Axis ...


    PCB HERO
    https://www.pcb-hero.com › blogs › lisas-column › how-...
    PCB HERO
    https://www.pcb-hero.com › blogs › lisas-column › how-...
    Jul 13, 2024 — The calibration process for a single-axis Fiber Optic Gyroscope (FOG) involves several critical steps to ensure its accuracy and reliability ...

    A Fast and Non-Directional Calibration Method for Fiber ...


    IEEE Xplore
    https://ieeexplore.ieee.org › document
    IEEE Xplore
    https://ieeexplore.ieee.org › document
    by Z Wang · 2019 · Cited by 4 — The laboratory three-axis inertial test turntable is used to improve the calibration accuracy of the fiber optic gyro inertial navigation system and improve ...

    Calibration method for misalignment angles of a fiber optic ...


    National Institutes of Health (NIH) | (.gov)
    https://pubmed.ncbi.nlm.nih.gov › ...
    National Institutes of Health (NIH) | (.gov)
    https://pubmed.ncbi.nlm.nih.gov › ...
    by J Ban · 2022 · Cited by 8 — This paper proposes a calibration method based on fine alignment algorithm to calibrate the gyroscopes' misalignment angles. Read more

    How Do Fiber Optic Gyros Work?


    Canal Geomatics
    https://canalgeomatics.com › knowledgebase › how-do-...
    Canal Geomatics
    https://canalgeomatics.com › knowledgebase › how-do-...
    During manufacturing, fiber optic gyros are calibrated to correct for several potential sources of error that may be introduced by the gyro itself or the ... Read more

    Systematic calibration method based on acceleration and ...


    AIP Publishing
    https://pubs.aip.org › aip › rsi › article › Systematic-cali...
    AIP Publishing
    https://pubs.aip.org › aip › rsi › article › Systematic-cali...
    Jan 5, 2021 — A simple systematic calibration method based on acceleration and angular rate measurements is introduced for the fiber - optic gyro strapdown ... Read more

    Calibration Method of Angular Velocity Sensor for Single- ...


    Ericco Inertial Technology
    https://www.ericcointernational.com › application › cali...
    Ericco Inertial Technology
    https://www.ericcointernational.com › application › cali...
    Jul 20, 2023 — The measurement data of inertial devices are compensated by calibration parameters and then navigation is solved to improve navigation accuracy. Read more
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    An alternative gyroscope calibration methodology - UJ Content


    University of Johannesburg
    https://ujcontent.uj.ac.za › esploro › outputs › doctoral
    University of Johannesburg
    https://ujcontent.uj.ac.za › esploro › outputs › doctoral
    by JAF Du Plessis · Cited by 4 — The specific focus of the study is to determine whether it is possible to reduce the calibration cost of the Fiber - Optic Gyroscopes through the ... Read more

    Scholarly articles for fiber optic gyroscope calibration method

    Self- calibration method based on navigation in high- … - ‎ Wang - Cited by 56
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    … with a precision- calibrated fiber - optic gyroscope - ‎ Chung - Cited by 204

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