Method and System for Sliding-Window Based Phase, Gain, Frequency and DC Offset Estimation for Servo Channel

摘要

Sliding-window based data processing includes receiving an analog signal, converting the analog signal to a series of digital samples synchronous to a sampling clock, performing a first discrete Fourier transform on a first portion of the series of digital samples, performing a second discrete Fourier transform on a second portion of the series of digital samples, performing a third discrete Fourier transform on a third portion of the series of digital samples, generating a first series of zero phase start values by calculating a zero phase start value based on the first discrete Fourier transform in a sliding-window at a series of time increments across the servo preamble, storing the zero phase start values, and averaging the stored zero phase start values at the end of the servo preamble.

主权项

1. A method for data processing in a servo channel comprising:
receiving one or more analog signals, wherein the one or more analog signals include a repeating signal; converting the one or more analog signals to a series of digital samples synchronous to a sampling clock; performing a first discrete Fourier transform on a first portion of the series of digital samples; performing a second discrete Fourier transform on a second portion of the series of digital samples; performing a third discrete Fourier transform on a third portion of the series of digital samples; generating a first series of zero phase start values by calculating a zero phase start value based on the first discrete Fourier transform in a sliding-window at a series of time increments across the servo preamble; storing the first series of zero phase start values for the time increments; and averaging the first series of stored zero phase start values at the end of the servo preamble.