How to select different images for interferometry


When selecting an image pair for interferometry, Can they be from different frames?

I have couple of images. Two from Frame: 42 (different dates) and one from Frame: 45 & Frame: 59

Thanks in Advance

as long as images are from the same track (relative orbit), they can be from different frames

Have a look at mengdahl’s explanations here: S1A-S1B coherence of partially overlapping images

and this similar question: INSAR / DINSAR - Perpendicular baseline calculation