angular accelerometer

angular accelerometer

[′aŋ·gyə·lər ak‚sel·ə′räm·əd·ər]
(engineering)
An accelerometer that measures the rate of change of angular velocity between two objects under observation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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From the point of view of technical implementation and high accuracy attainability in finding the geographic north heading, a better option is a well-known method based on the direct finding of Earth angular velocity vector by means of an angular accelerometer rotating about the axis orthogonal to the sensitivity axis of that accelerometer.