little off topic.....
1) Do we have good radar system which is highly recommended for mountain regions, do our radar facilities hold upper arm with PLA ?
IA has
Cymbelline & Firefinder radars across its frontiers. Cymbelline is widely successful in locating artillary/mortar. Firefinder can detect incoming missiles sharply & with addition of sector antenna can extend its range in desired direction.
I'm not aware about IA but IAF has most likely covered the chinese border terrain with its GS100 sensors which is capable of tracking multiple targets with complex flight paths at lower altitudes. This SR3D platform is transportable so its most likely that IAF has mapped the plains from various locations within last 3-4years though it does not have larger numbers of these radars.
They also have Phalcons which has helped in cross-checking the ground radar findings.
In addition ACM recently spoke of acquisition of new radars especially to plug remaining gaps on eastern border.
PLA does not have terrain dodging systems so imo their Indian side terrain plotting is irregular. But they've airborn radars too.
For chinese CCS5 missiles, we've swordfish LRTR radar whose results are impressive so far & we are still enhancing it with israeli engineers.
2) GOI or PLA whos RADARs are most effective in mountain terrain borders ?
this 2nd question raised in my mind coz US helicopters entered Pakistani airspace making use of blind spots in the radar coverage due to hilly terrains ? so do can missiles....
PLA has employed larger number of radars, most of them are cross-breed. However their success is little known. We can not know effectiveness of their radars unless IAF/IA has undertaken some snooping activity on the other side of border. Little info on that will surface in public domain.
If you are talking of missile like brahmos evading radar coverage then effectiveness of PLA radars has smaller part to play in it. Brahmos is supersonic & its flight trajectory plotting after launch is very difficult task. You need highly powerful computer processors to do so. Above that interceptors will have to be deployed within seconds who obviously need to be supersonic so if first interceptor fails, you can launch another with still little chance to take out brahmos.
And if there is salvo attack of brahmos, then I don't need to say anything.