This engagement seemed to high for a commercial drone of the type you were thinking.Whenever I see the Russians using SAMs to take out these small drones, often commercial ones like you-know-who, I keep thinking wouldn't it be more economical to use ack-acks like a Zu-23 instead?
Granted it wouldn't be as precise, but the flak rounds would take them out just the same. Even with something as old as a Strela-10 or an Osa, I just think how cost-ineffective it is, that they'd be better served taking out helos or Su-25s (whatever the Ukrainians got left) and actual military drones like the TB2.
I think another matter to take into consideration is whether these SAM systems, especially the older ones, can even detect and track those small drones. Most of them will be flying relatively low and at a relatively low speed. Therefore they will be in a radar signal return zone of the side lobe beam which is clutter heavy as it scatters off terrain, buildings, etc.
To remove clutter, older radars rely on Doppler shift which makes it possible to differentiate signals based on their radial speed. Using this information a SAM radar interested in detecting aircraft can remove clutter signal by filtering any data with a radial speed say less than 100 kph. This makes the radar blind to objects moving at a slower speed. Therefore, a small drone has a good chance of falling within this blind zone of the radar and flying up to the radar undetected.
Theoretically, even at high altitude, if you fly in a circle around an older pulse doppler radar you may be invisible to it because your radial velocity will remain zero.
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