The position location accuracy of a point source in the fields of view of two telescopes with the same focal plane is considered. It is shown that for detectors sized to equal the distance to the first zero of the coherently added system, there is little, if any, difference in accuracy between a system that adds the flux coherently as opposed to a system that adds it incoherently.
William L. Wolfe, William L. Wolfe,
"Comparison Of Coherent And Incoherent Imaging In The Location Of Point Sources", Proc. SPIE 0226, Infrared Imaging Systems Technology, (24 June 1980); doi: 10.1117/12.958729; https://doi.org/10.1117/12.958729