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Transient signal measurement and analysis of in-situ flying height test during track seeking process

机译：航迹寻找过程中瞬时飞行高度测试的瞬态信号测量与分析

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In view of the fact that the head-disk clearance approaches several nanometers for the next generation magnetic recording system, head-disk contacts, especially during the seeking processes, could happen and these contacts may deteriorate the overall performance. A hardware setup using triple harmonic method for flying height measurement during track seeking as well as track following processes is described. Tradeoff is made between less ISI distortion and higher selectivity of the harmonic selection channel. The linear equalizer based on the minimum mean square error criterion (MMSE) has been developed to remove the ISI distortions. The least mean square (LMS) algorithm is used to calculate the tap weight coefficients. The results show that 1 nm accuracy for FH measurement during track seeking process can be achieved.
机译：考虑到对于下一代磁记录系统，磁头-磁盘间隙接近几纳米的事实，特别是在寻道过程中，可能发生磁头-磁盘接触，并且这些接触可能使整体性能恶化。描述了使用三次谐波方法在寻道以及跟踪过程中测量飞行高度的硬件设置。在较小的ISI失真和较高的谐波选择通道选择性之间进行权衡。已经开发了基于最小均方误差标准（MMSE）的线性均衡器来消除ISI失真。最小均方（LMS）算法用于计算抽头权重系数。结果表明，在寻迹过程中可以实现1 nm的FH测量精度。

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