Isos wrote:Tanks for the answers.
But I need precisions about active radar homing missiles (3rd question).
Yes it does need an illuminating radar. Radars of such missiles are very small and limited by their Power to have enough range or resolution to detect VLO/LO objects even normal sized Aircrafts won't be dedacted by the missiles seeker untill they come in OLS range (IRST). So the big part of this answer is no they can not detect stealth planes unless that stealth plane is stupid enough to be illuminated by ground based radar along with other radar sources then the Missile has all information necessary to get close to the target and see it from short range itself.
You're saying that it needs illuminating radar. But if the missile has an active radar homing head it means that it is tracking a target by its own in the terminal phase. It uses ground radar just for mid corrections to give it an aproximative position (I'm not an expert but I don't think you need an illuminating radar for that, no ??) , otherwise it's a semi-actif missile.
So for stealth plane, according to what you said, they will more likely use semi-actif ??
missiles can have mini radars.. s-400 have radars.. fixed radar stations can have longer range radars . At what minimum altitude an S-400 can hit? last i saw was 5 meters above ground.
it all depends of how well you monitor the airspace.. if all you do is deploy an S-400 unit in one place and hope to target all at any altitude as far as 400km range ,then you a re doing something really wrong. Because enemy can fly under the radar ..taking advantage of earth that is not flat. You need planes and awacs to improve the vision of radars ,specially at low altitudes of things that use mountains or elevated terrain as cover.
if you look at that image ,you will see there are areas that radars can't see.. when something very solid blocks the way.. either a mountain or the earth curvature at some long distance it blocks radars view on the ground. So this is why you need Radars at high altitude,ideally planes,
like awacs or hellicopters with radars or planes..
The smaller the radar the smaller the area it can see at the same time.
If you ever used binoculars ,that will be similar to the radars of missiles. it can only focus in a small area.. So you need a bigger Radar to tell the missile where to go ,and the missile use its own radar only when the plane is at visual distance in the final approach.
Stealth planes are not invisible ,they only have a lower radar signature. So what that means?
that if the S-400 can detect a plane at 600km.. something like an F-22 will only be detected using conventional radars at 100km to 200km. But this is only the case IF... you only had one S-400 system deployed in one place.. if you deploy Pantsirs defenses in the front line ,at the borders of any country.. they have ultra sensitive Heat sensors that stealth cannot hide..and it will provide location of any F-22 plane as soon it enters illegally your airpace and supply that information to the S-400 unit.. so that it can engage the stealth plane ,that usually see at 100km to 200km distance.. now will see it at any distance.
That said Stealth planes will lose its stealthiness is a zone heavily covered by many different
kinds of radars. deployed across a country. and no plane will be able to hide from radars if they are setup correctly across a whole territory and have the support of Air radars ,like Awacs or hellicopters etc.
This means that S-400s are far from the only dangerous weapon that Russian enemies needs to be worried. Things like Pantsirs are really deadly.. even more i will say. because they have a gatling gun ,that can't be jammed, you can't jam a bullet.. and pantsirs can operate with radars turned off and highly mobile , so you will only know where they are ,when they hit your plane.
So effectively S-400s works like a sniper rifle.. while pantsirs is like a mine. it will get you if your plane move to the wrong place where a pantsir is hiding and defending it. Imagine you entering a minefield ,that you don't know where the mines are.. and at the same time a sniper is shooting at you. Not cool.. and indeed you will not go there if you knew the place was mined
with a sniper that you cant see either its position but that he can see you.
A really well defended airspace ,needs to combine long range with medium and short range defenses. it should have S-400s + Buks/Tors + pantsirs. The only ones the enemy will know
the location are the S-400s..and they will be out of range of any enemy plane.. only cruise missiles could target long range places.. but they can be easily defeated by Pantsirs ,Gps jamming and other things. All said is not a piece of cake to defeat a zone well covered by S-400s. not even by stealth planes ,contrary to what you have heard. And if you have a strong Airforce is even worse.. because the airforce will interrupt any enemy attempt to even try to break into your airspace.
The only effective way to defeat an S-400 is with boots on the ground..with paramilitary groups
undercovertly taking territory and getting to artillery distance to your air defenses. This is exactly why Russia is bombing any terrorist position in Syria latakia ,because they represent the biggest threat to S-400s. They are not designed to operate withing artillery range of enemy positions.
It is also important to remember that S-400s are only useful if used. and you cannot measure
its real performance now in places like Syria.. because Russia is not a war with any nation . not yet. So Russia rules of engament allows foreign nations to get a bit close to S-400s positions. The real way to measure S-400s capabilities is in a full scale war and against a modern nation with modern air defenses and airforce. thats when Russia can really keep at distance any potential enemy plane ,beyond its range of combat.