How to use a FIR on a signal with a drifting central frequency?

1. How do you measure frequency drift?
2. What is drift in a signal?
3. What causes signal drift?

How do you measure frequency drift?

The Frequency Drift Rate is calculated by comparing the measured drift in each 10 bit group and comparing it with the measured drift in each of the 2 adjacent 10 bit groups. The largest difference is taken as the measurement result.

What is drift in a signal?

Results: Signal drift, a global signal decrease with subsequently acquired images in the scan, was observed in phantom data on all three scanners, with varying magnitudes up to 5% in a 15-min scan. The signal drift has a noticeable effect on the estimation of diffusion parameters.

What causes signal drift?

Given the multiple causes of signal drift, the variation between vendors, scanners, and scanner environment, and factoring in the large range of diffusion MRI scan protocols used across studies and sites, it is important to investigate the extent of signal drift and the impact on analyses for each site or scanner.