Sunamer :
There is no flying Russian UAV that can fly that high.
Good, then that narrows it down to one
AAKEE :
the length of the trace is approx. 1 minute of flight
If you are correct then, if (and a big if) a collision occurred it would have almost certainly occur been well before that.
The SSR-system, I think, don't produce close to that number of measurements in one minute.
AAKEE what you see here in the photo you published is a synthetic radar picture , like a PC screen. You can put any update rate you want in the " settings " .
SSR returns depends on the number of actual radar heads fed into your system. If you use multi-radar tracking ( most if systems do today) you can have updates every second if you wish. but what you will see will be a calculated mean position, not the actual exact position at a given time . You can also make it a constant moving target , with the software filling the blanks in between returns .
The whole thing is pretty accurate, in the 0,1 NM range, and more than sufficient for ATC purposes .
You can also feed the primary radar returns in that system, but they will be digitized and shown separately from the SRR.
Now I have heard the investigation team has analysed both the CVR which gives a clue apparently,and the FDR, so we should know soon what happened.