Data storage device demodulating servo stripes using matched filter

A data storage device configured to access a magnetic tape comprising a plurality of servo frames each comprising an A servo burst, a B servo burst, a C servo burst, and a D servo burst, the data storage device comprising:

• at least one head configured to access the magnetic tape;
• and
• control circuitry configured to:
• measure an estimated time ta from a center of the A servo burst in a first servo frame to a center of the A servo burst in a second servo frame;
• generate an A burst window for the A servo burst in a third servo frame based on the estimated time ta;
• read the A servo burst in a third servo frame using the head to generate a first read signal;
• sample the first read signal to generate first signal samples;
• use a first matched filter matched to the A servo burst to filter the first signal samples to generate first filtered samples within the A burst window;
• process the first filtered samples to generate a position error signal (PES);
• and
• control a position of the head relative to the magnetic tape based on the PES.

A data storage device configured to access a magnetic tape comprising a plurality of servo frames each comprising an A servo burst, a B servo burst, a C servo burst, and a D servo burst, the data storage device comprising:

• at least one head configured to access the magnetic tape;
• and
• a means for reading the A servo burst in a first servo frame using the head to generate a first read signal;
• a means for sampling the first read signal to generate first signal samples;
• a means for using a first matched filter matched to the A servo burst to filter the first signal samples to generate first filtered samples within a first burst window;
• a means for first updating the first burst window based on the first filtered samples;
• a means for processing the first filtered samples within the first burst window to generate a position error signal (PES);
• and
• a means for controlling a position of the head relative to the magnetic tape based on the PES.