precession

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precession

An MRI term for the relatively slow gyration of the axis of a spinning body, which traces out a conical configuration. Precision is caused by the application of a torque which tends to change the direction of the rotation axis and is continuously directed at right angles to the plane of the torque. The magnetic moment of a nucleus with spin will experience such a torque when inclined at an angle to the magnetic field, resulting in precession at the Larmor frequency.

pre·ces·sion

(prē-sesh'ŭn)
The secondary spin of magnetic movements around the main magnetic field.
References in periodicals archive ?
Caption: FIGURE 5: The sample standard deviation of the gyro drift.
Hence, applied corrections compensate only for the gyro drift, which is rather logical regarding the texting mode scenario.
The average estimation errors of the attitude and the gyro drift rate bias with their respective 3[sigma] bounds in the PEF are shown in Figure 4.
Once the new heading reference system is started, it's business as usual, as long as you pay attention to position checking and gyro drift.