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OEM calibration for Inertial Navigation Systems (INS) involves rigorous factory-level procedures, including multi-axis rate table testing, thermal chamber cycling (

negative 45 raised to the composed with power C

75 raised to the composed with power C

), and mathematical modeling to correct for bias, scale factors, non-orthogonality, and g-sensitive drifts. These techniques ensure high-precision, repeatable performance for gyroscopes and accelerometers by comparing outputs against known reference data.

Key OEM Calibration Techniques and Procedures

Rate Table & Motion Analysis : IMUs are mounted on precision, multi-axis turntables to subject sensors to known angular rates and orientations, allowing for the mapping of sensor errors across all axes.
Thermal Compensation : Sensors are cycled through extreme temperatures (e.g.,

$negative 40 raised to the composed with power C$

to

$85 raised to the composed with power C$

) to characterize and calibrate thermal drift, as IMU outputs vary significantly with temperature.
Bias & Scale Factor Estimation : Advanced methods like Allan variance analysis are used to identify and correct sensor biases and scale factors.
Multi-Position Calibration : The sensor is placed in specific, static orientations to use the Earth's gravity as a reference for accelerometer calibration, often using weighted least squares (WLS) methods to calculate parameters.
Magnetometer Calibration : 3D, 2D-2T, or 2D calibration techniques are applied for different operating environments to improve attitude estimation.
Alignment & Orthogonality : Ensuring the sensitive axes of gyroscopes and accelerometers are perfectly orthogonal to each other and aligned with the device frame, using mechanical measurements (laser theodolites) or estimation-based techniques.
Aging & Final Acceptance Testing : High-end, sensitive IMUs undergo aging processes to monitor performance over time and adjust for long-term drift.

Common Calibration Models
The calibration model typically includes parameters for:

Bias (

$b$

): The constant offset in the output.
Scale Factors (

$cap S$

): The ratio of output change to input change.
Non-orthogonality/Misalignment (

$alpha$

): Angles between the sensitive axes.
Lever Arm Effects: Correcting for the distance between the IMU and the vehicle's center of gravity.

These procedures are vital for minimizing errors in high-performance navigation applications .

Inertial Navigation Systems | INS
How is an INS calibrated and tested? An INS calibration is important in ensuring that the sensor output results are accurate and r...

Advanced Navigation
The Inertialist: Quartz or Silicon? - Inside GNSS

Inside GNSS
Improving the calibration process of inertial measurement unit for marine applications | NAVIGATION
The calibration model includes parameters such as: * Bias * Scale factors * Non-orthogonality * Lever arm effect for accelerometer...

The Institute of Navigation

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Inertial Navigation Systems | INS

Advanced Navigation

https://www.advancednavigation.com › inertial-navigati...

Advanced Navigation

https://www.advancednavigation.com › inertial-navigati...

An INS calibration is important in ensuring that the sensor output results are accurate and repeatable within the specified operating conditions. Calibration is ... Read more

Missing: ~~techniques~~ ‎| Show results with: techniques

Scholarly articles for oem calibration techniques for inertial navigation systems manufacturer
… world smallest, most accurate and reliable pure inertial … - ‎ Deleaux - Cited by 15 … Inertial on an RTK GPS Receiver: Integration Options … - ‎ Ford - Cited by 14 … navigation accuracy using inertial navigation systems … - ‎ Panish - Cited by 102

The Inertialist: Quartz or Silicon?

Inside GNSS

https://insidegnss.com › the-inertialist-quartz-or-silicon

Inside GNSS

https://insidegnss.com › the-inertialist-quartz-or-silicon

Jul 29, 2024 — Customers can work with OEMs to specify calibration techniques to enhance sensor accuracy and reliability across operating conditions. Parameter ... Read more

Our Company

SBG Systems

https://www.sbg-systems.com › company

SBG Systems

https://www.sbg-systems.com › company

We design, manufacture , and support an extensive range of state-of-the-art inertial sensors such as Inertial Measurement Units (IMU), Attitude and Heading ... Read more

An Inertial/GPS Navigation System on the OEM4 Receiver

University of Calgary

https://www.ucalgary.ca › engo_webdocs › PDF

University of Calgary

https://www.ucalgary.ca › engo_webdocs › PDF

PDF

The initial approach was to use an OEM 3 (Millennium™). GPS receiver from NovAtel Inc. and an HG1700 AG11 strapdown inertial unit from Honeywell and run the ... Read more

19 pages

Magnetometer Calibration for Inertial Systems | UST

Unmanned Systems Technology

https://www.unmannedsystemstechnology.com › 2020/10

Unmanned Systems Technology

https://www.unmannedsystemstechnology.com › 2020/10

Oct 3, 2020 — Inertial Labs has released a technical article outlining the role of magnetometers in inertial navigation systems (INS) and the various methods ... Read more

Missing: ~~techniques~~ ‎| Show results with: techniques

An Improved System-Level Calibration Scheme for Rotational ...

National Institutes of Health (NIH) | (.gov)

https://pmc.ncbi.nlm.nih.gov › articles › PMC9571831

National Institutes of Health (NIH) | (.gov)

https://pmc.ncbi.nlm.nih.gov › articles › PMC9571831

by Q Wei 2022 Cited by 14 — SAGEM has designed an 18-position calibration scheme that is a common method for calibrating laser gyro-jet inertial navigation systems, which has been tested ... Read more

Missing: ~~oem~~ ‎| Show results with: oem

IMU Calibration and Validation in a Factory, Remote on ...

College of Engineering - UC Santa Barbara

https://sites.engineering.ucsb.edu › plans14

College of Engineering - UC Santa Barbara

https://sites.engineering.ucsb.edu › plans14

PDF

by MJ Jørgensen Cited by 11 — Two different methods of calibration are investigated: Kalman smoothing using an Aided Inertial Navigation System (AINS) framework, augmenting the error state ... Read more

8 pages

SBG SYSTEMS IMU Production Process

Unmanned Systems Technology · SBG Systems

https://www.unmannedsystemstechnology.com · Jul 23, 2024

Unmanned Systems Technology · SBG Systems

https://www.unmannedsystemstechnology.com · Jul 23, 2024

2:24

Every SBG product is manufactured and calibrated in France. Each high-performance IMU is subjected to a strict calibration process.

Missing: ~~techniques~~ ‎| Show results with: techniques

3.2 IMU Calibration & Characterization

VectorNav Technologies

https://www.vectornav.com › resources › specs-imucal

VectorNav Technologies

https://www.vectornav.com › resources › specs-imucal

Sensor calibration is a method of improving a sensor's performance by removing structural errors from the measurements of the sensor. Read more

Alignment and Calibration of Optical and Inertial Sensors ...

dtic.mil

https://apps.dtic.mil › sti › pdf › ADA462968

dtic.mil

https://apps.dtic.mil › sti › pdf › ADA462968

PDF

by M Veth 2007 Cited by 25 — Aircraft navigation information (position, velocity, and at- titude) can be determined using optical measurements from an imaging sensor pointed toward the ... Read more

11 pages