I've watched plenty of combat footage on Reddit in Ukraine and noticed artillery shells make a high pitched doppler sounded before they impact, usually 1-2s before. You can always see soldiers hit the ground... even when the impact is really far away. Is this intentional?

Where basically you create suppressive fear over a large area but even if you hear it you rarely have any reasonable reaction time to do anything about it if it hits near you (unless you have a foxhole). But it still scares the shit out of everyone nearby?

Or is this just merely a side effect of the munition traveling through the air at high speeds?