The ultra-high storage density in probe storage devices makes positioning a significant challenge. The probes have to be positioned over the storage medium with nanoscale accuracy. A feedback-control scheme based on a high-precision global-positioning sensor can provide the required accuracy. However, drift and low frequency noise affects the performance over long periods of operation. A novel control architecture based on the H-infinity control framework is presented which addresses this problem by using media derived positional information along with the global positioning sensor. This controller has a multiple input single output (MISO) structure and uses the best measurement in different frequency regions. Experimental results on a probe-storage device prototype demonstrate the efficacy of this approach.
By: Aggeliki Pantazi, Abu Sebastian, Haris Pozidis, and Evangelos Eleftheriou
Published in: Proc. of the 44th IEEE Conf. on Decision and Control, and the European Control Conf. 2005, Seville, Spain, IEEE, p.1174-1179 in 2005
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