In article , I wrote:
A word: synthetic aperture.

Drone array, anyone?

[...]

Or just calculate directly. I think the angular
resolution of an array or a telescope in radians is
something like

0.22 * wavelength / aperture .


Oops. That's 1.22 .

Still, I don't think it's too bad considering how
long ago I learned about synthetic aperture
arrays in 2nd year physics.

George