alignment (gyro, accelerometer): See: input-axis misalignment.
Allan variance: A characterization of the noise and other processes in a time series of data as a function of averaging time. It is one half the mean value of the square of the difference of adjacent time averages from a time series as a function of averaging time.
angle random walk (gyro): See: random walk (angle random walk).
angular acceleration sensitivity: (A) (accelerometer) The change of output (divided by the scale factor) of a linear accelerometer that is produced per unit of angular acceleration input about a specified axis. excluding that response which is due to linear acceleration. (B) (gyro) The ratio of drift rate due to angular acceleration about a gyro axis to the angular acceleration causing it.
NOTE— In single-degree-of-freedom gyros. it is nominally equal to the effective moment of inertia of the gimbal assembly divided by the angular momentum.
angular accelerometer: An inertial sensor that measures the rate of change of inertial angular velocity about its input axis(es).
NOTE—An output signal is produced from the angular motion of a proof mass (rigid or fluid) relative to a case: or by differentiating the output of a strapdown gyroscope; or by processing the outputs from an array of linear accelerometers.
angular velocity sensitivity (accelerometer): The change of output (divided by the scale factor and the square of angular rate or product of two angular rates) of a linear accelerometer that is produced per unit of angular velocity squared, when spun about a specified axis, excluding the response that is due to acceleration. See: effective center-of-mass for angular velocity; rate-squared sensitivity.
angular vibration sensitivity (gyro): The ratio of the change in output due to angular vibration about a sensor axis to the amplitude of the angular vibration causing it.
angular-case-motion sensitivity (dynamically tuned gyro): The drift rate resulting from an oscillatory angular input about an axis normal to the spin axis at twice the rotor spin frequency. This effect is due to the single-degree-of-freedom of the gimbal relative to the support shaft and is proportional to the input amplitude and phase relative to the flexure axes. See: to-N (ZN) angular sensitivity.IEEE 528-2019 pdf free download.