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FOG IMU accuracy is primarily influenced by temperature fluctuations affecting optical components, bias drift/scale factor instability over time, and mechanical vibration, necessitating robust calibration and thermal compensation. While offering superior stability over MEMS, FOG accuracy also depends on optical source aging, sensor misalignments, and initial alignment accuracy.
Key factors influencing FOG IMU accuracy include:
- Temperature Variations: Changes in operating temperature cause physical stresses and refractive index variations in the fiber, introducing bias errors. Effective thermal compensation or isolation is crucial.
- Sensor Aging and Stability: Over time, components like optical fibers and laser diodes age, causing gradual drifts in bias and deviations in scale factors.
- Dynamic Environment & Vibration: Although FOGs are robust, high-dynamic environments (vibrations/shock) can affect accuracy if not properly calibrated, necessitating precise factory calibration for scale factors, cross-axis sensitivity, and installation alignment.
- Initial Alignment/Calibration: The accuracy of the IMU relies on accurate calibration of internal sensor parameters, including gyro drift, scale factors, and initial attitude/position alignment.
- Time Asynchrony: Asynchronous sampling of inertial sensors during high-dynamic operations can lead to velocity updates deterioration and reduced navigation accuracy.
FOG IMUs are preferred for high-precision scenarios (underground, aerospace) due to their low bias drift and high-performance stability, but they require periodic re-calibration or maintenance to counteract long-term drift.
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Scholarly articles for Factors influencing FOG IMU accuracy | |
… and negative FOG scale factors using a low-precision … - Pan - Cited by 7 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 | |
Web results
Measurement Error and Calibration of FOG IMU
Medium · Ericco Inertial Technology
2 years ago
Medium · Ericco Inertial Technology
2 years ago
In addition, parameters calibrated at room temperature will reduce FOG IMU measurement accuracy if applied at high or low temperatures. Methods ...Read more
A time asynchronous parameters calibration method ...
IOPscience
https://iopscience.iop.org › article
IOPscience
https://iopscience.iop.org › article
by J Chang2023Cited by 6 — ... factors, drifts, installation errors, and inner lever-arm ... Thus, the proposed method can increase the accuracy of high-precious FOG-IMU.Read more
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 — In this paper, a hybrid grading calibration method is proposed. High-precision calibration parameters is available using low precision turntable with the same ...Read more
MEMS Vs FOG: What Inertial System Should You Choose?
Advanced Navigation
https://www.advancednavigation.com › Tech Articles
Advanced Navigation
https://www.advancednavigation.com › Tech Articles
Feb 10, 2022 — Both FOG and MEMS accuracy are impacted by variations in temperature. ... affecting the accuracy of attitude estimation in an INS. While ...Read more
Application and Development of Fiber Optic Gyroscope Inertial ...
National Institutes of Health (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC10303591
National Institutes of Health (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC10303591
by H Xu2023Cited by 23 — In underground space, FOG-INS faces various challenges, such as narrow space, harsh environment, signal interference, and lack of external information, which ...Read more
Influence analysis of IMU accuracy on spoofing detection ...
Ericco Inertial Technology
https://www.ericcointernational.com › application › infl...
Ericco Inertial Technology
https://www.ericcointernational.com › application › infl...
Jan 10, 2024 — IMU is used to measure the angular velocity and acceleration of objects. The accuracy of the IMU determines the accuracy.
MEMS vs FOG: What Inertial System Should You Choose?
Inertial Labs
https://inertiallabs.com › Resources › White Papers
Inertial Labs
https://inertiallabs.com › Resources › White Papers
Nov 26, 2024 — FOG gyroscopes have excellent bias stability, making them particularly suitable for navigation applications that require accurate inertial ...Read more
Estimated the scale factors of accelerometers triad of FOG ...
ResearchGate
https://www.researchgate.net › figure › Estimated-the-sc...
ResearchGate
https://www.researchgate.net › figure › Estimated-the-sc...
The error of its Inertial Measurement Unit (IMU) plays an important role in INS accuracy. After the error of the IMU is calibrated and compensated, the ...Read more
Choosing an IMU: FOG vs MEMS IMUs
Canal Geomatics
https://canalgeomatics.com › knowledgebase › choosin...
Canal Geomatics
https://canalgeomatics.com › knowledgebase › choosin...
The superior accuracy of a FOG is seen in low bias instability, or drift over time. For applications requiring dead reckoning position updates or experiencing ...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 — Mathematical formula for FOG IMU angular velocity channel errors, including scale factor, misalignment, ... affecting the stability and accuracy ...Read more