Nanoscale track-follow performance for flexible tape media
Mark A. Lantz, Angeliki Pantazi, et al.
IFAC Proceedings Volumes
The resolution limits of tape head lateral position estimates derived from timing-based servo (TBS) patterns preformatted on perpendicularly oriented barium ferrite tape media are investigated. A set of four new TBS patterns with azimuth angles ranging from 15° to 24° but having, otherwise, identical parameters are compared. Measurements of the standard deviation of the closed-loop position-error signal are compared with resolution estimates based on: 1) the noise floor of the power spectral density of the lateral tape motion measured from the servo pattern during open or closed-loop track-following and 2) an analytical lower bound on the mean-squared estimation error, which depends on the servo readback signal shape and the signal-to-noise ratio. All four servo patterns are shown to achieve nanoscale resolution under realistic operating conditions. The 24° pattern was found to provide the highest performance with a position estimation resolution better than 3.8 nm for a single channel, and better than 2.6 nm when the estimates of two channels are combined.
Mark A. Lantz, Angeliki Pantazi, et al.
IFAC Proceedings Volumes
Giovanni Cherubini, Simeon Furrer, et al.
IEEE/ASME TMECH
Giovanni Cherubini, Jens Jelitto
MECH 2010
Giovanni Cherubini, Jens Jelitto
AIM 2012