Inertial Sensor Calibration, What For?

Calibration to Ensure a Predictable Behaviour

All sensors components are different: manufacturing process including electronics implies mechanical stress on sensor elements. This stress modifies each sensor behaviour in an unpredictable way. This means the repeatability of inertial sensors may be compromised without a proper compensation.

Stability during Temperature Variations

Sensors are also affected by temperature variations. They can be more or less affected depending on their quality, but it will always have an impact on accuracy. If the application is airborne, marine or ground type, an inertial device is expected to keep working the same way, no matter if the temperature drops below 0°C or rises up to 40°C.

What Does SBG Calibration Compensate?

We have developed an advanced Calibration procedure that is applied on every sensor we deliver. This procedure is able to compensate for most errors observed in MEMS sensors technology:

  • Gain and bias temperature compensation for accelerometers and gyroscopes
  • Gain temperature compensation for magnetometers
  • Cross-axis and misalignment effects compensation for accelerometers, gyroscopes and magnetometers
  • Non linearity correction for gyroscopes
  • Gyro-G effect compensation for gyroscopes

The calibration procedure is performed over the full specified temperature range, so our sensors performance will be optimal at any temperature in the specified range.

Is There any other Calibration to Do?

For Ellipse sensors, the only calibration you will have to do is the magnetometers calibration, in case you configured the device to use a magnetic heading.

Is it Possible to Decalibrate the Product?

This should not happen as long as the sensor is operated in normal conditions. But in case of a shock above the absolute maximum ratings or if the sensor experienced very strong vibrations for a long time, then you may have a bias. If that happens, you should contact the support team.

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