Angular Calculation
Determining the orientation of an object relative to the gravity vector is a primary requirement for stabilizing mobile electronics and industrial platforms. In sensor systems, tilt estimation uses three-axis accelerometers to measure the static component of acceleration due to gravity along each axis. Trignometric functions then convert these measured vectors into roll and pitch angles.
This method is accurate under static or slow-moving conditions.
Sensor Fusion
Multi-axis gyroscopes are combined with accelerometers to overcome the interference caused by translational acceleration during motion. In dynamic environments, tilt estimation relies on sensor fusion algorithms, like a complementary or Kalman filter, to combine the fast response of the gyroscope with the long-term stability of the accelerometer. This combination filters out the high-frequency noise and translational acceleration that would otherwise distort the calculated angle.
This algorithm provides a reliable and continuous orientation signal.
Dynamic Compensation
Heavy vibration from engines or rotating machinery introduces significant high-frequency noise that can saturate the input of the accelerometer. Under these conditions, tilt estimation requires careful mechanical damping and digital low-pass filtering. These filters remove the vibration signals before they are processed by the fusion algorithm.
This step ensures that the estimated angle remains stable even when the system is subjected to continuous mechanical disturbance.
Calibration Accuracy
Manufacturing misalignments and sensor biases introduce steady-state offset errors that degrade the calculated angle. For accurate tilt estimation, a multi-position calibration procedure is performed to determine the scale factor and bias offset for each sensor axis. These calibration parameters are stored in the system memory and applied to the sensor readings before the angular conversion occurs.
This calibration is verified by comparing the system output against a high-precision rotary table, ensuring the calculated angles remain within the specified tolerance.
