Some are drifting to due to their environment.
Changes in temperature, humiditty, airpreassure… You name it, affect almost every sensor. What documented noice resp. drift have do You face?
When the IMU is static, the gyroscope data, which is themeasurement of angular velocity, should ideally provide thereading values of zero. But in reality, each static gyroscope canincorrectly generate a reading that deviates from zero, called thebias offset error. This type of error is the major cause thatproduces the drift, the significant error of the orientationmeasurement. The drift is the phenomenon that takes place whenthe bias offset error and noise in gyroscope measurements areaccumulated by means of integration through time and yieldunacceptable orientation results.
From the quoted text, it seems to indicate that drift is a result of integration. So, the angular velocity should not contain any drift. Am i correct?