Bias instability

1. What is bias instability?
2. What is bias in gyroscope?
3. What causes accelerometer bias?
4. What is sensor bias?

What is bias instability?

The in-run bias stability, or often called the bias instability, is a measure of how the bias will drift during operation over time at a constant temperature. This parameter also represents the best possible accuracy with which a sensor's bias can be estimated.

What is bias in gyroscope?

Gyroscopes are subject to bias instabilities, in which the initial zero reading of the gyroscope will cause drift over time due to integration of inherent imperfections and noise within the device. Bias repeatability can be calibrated across the known temperature range of the IMU.

What causes accelerometer bias?

The bias of an accelerometer is the offset of its output signal from the actual acceleration value. A constant bias error causes an error in position which grows with time. It is possible to estimate the bias by measuring the long term average of the accelerometer's output when it is not undergoing any acceleration.

What is sensor bias?

When looking at the inertial sensor data of gyroscopes and accelerometers you can see that there is often a small offset in the average signal output, even when there is no movement. This is what is known as Sensor Bias.