Question

What is interferometric acuity?

Answer 1

The use of fringe patterns in interferometry to determine the relative clarity of an image.

Explanation:

To close approximation, the relative shift between fringes of different colors is directly proportional to the amount of lateral displacement of the instrument, with the constant of proportionality equal to the longitudinal chromatic aberration.
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-29-10-1411

Interferometric analysis of GPS phase observations
https://www.researchgate.net/publication/234323445_Interferometric_analysis_of_GPS_phase_observations

Interferometric Analysis Method for Radio Impulses
https://arxiv.org/pdf/1304.5663.pdf