Soviet reconnaissance, artillery, and Air defence

[JDR Dragoon]

I read somewhere, that those options are possible, although it depends on the commander.

Yes. Again notice, that the Forward detachment/OMG is usually also a combined arms force (usually quite tank heavy though), at most consisting of 1/3 of the superior formations fighting power. 1/3 here and 1/3 there. Begin to see a pattern? ;)

Have you any idea on how those works?

The same way every other radars work; by bouncing rays off objects. Only instead of bouncing rays off things in the air the GSR bounces rays off things on the ground. The problem here is, that a lot of things bounces the rays back on the ground (houses, large rocks etc.) so it is usually best at discovering enemy units in motion. Although getting a return of a platoons worth of "blips" sitting still in an extended line in otherwise flat ground can be a dead giveaway.