Before I go on, thanks everyone for the discussion, it is nice to have a thought provoking discussion once a while
ricnunes wrote:It doesn't matter how powerful a warship radar is, if the missile isn't in line of sight with incoming missiles it won't detect them, simple as that! This means that incoming sea skimming anti-ship missiles will only be detected at very short ranges (likely less than 15km) which means that and with the high speed that such missiles will travel while being completely passive, the ship's engagement window will be very short.
Again, the shorter the engagements window is the less probable is for the warship to intercept all incoming missiles.
I did some calculation,
Type 055 radar mass is at 27 meters above the sea surface, that mean the radar horizon against a missile skimming at 1 meter above the sea surface is 25.5 km and the radar horizon against a F-35 loiter 50 meters above the sea is 50.5 km
At speed of Mach 0.9, LRASM and JSM will takes
83 seconds from the time they pop up from radar horizon until impact.
For comparison, supersonic missile such as Rocks and AARGM-ER can't sea skimming, they either climb or fly a direct path to target. So they are detected the same time as F-35 rise up from the horizon. At Mach 4 against a target 50.5 km away, AARGM-ER will give Type 055
37 seconds of warning till impact. Whereas, at Mach 5, Rocks will give the destroyer
29 seconds of warning till impact. So supersonic missiles still seem to give less warning time to enemy
These time are short but still isn't outside the capability of defensive system to react, I mean simple active hard kill protection on MBT can react within milliseconds, the far more complex ship radar should be at least as good
ricnunes wrote:Yes, but the Harpoon and other missiles of the era (like the Exocet for instance) are active radar guided which means that the enemy ship's ESM will very soon and even before all other sensors pick up the incoming missiles which means that in this case the ship will inevitable have a somehow bigger window of opportunity to engage these missiles as opposed to passive guided missiles like the JSM or LRASM.
I agree that Harpoon and Exocet are much easier to detect than LRASM and JSM, but when they are below radar horizon, they aren't much different from LRASM and JSM because there is no line of sight for radar to detect them anyway.
ricnunes wrote:And how many SAM's can you launch simultaneously from those VLS against 6 incoming missiles?? And how many of those SAM's can a warship like the Type 055 guide simultaneously?? And against how many targets/incoming missiles simultaneously??
Each VLS group can ripple fire 3 missiles near simultaneously, so with 2 VLS group, one at the front, one at the back, I expect that Type 055 can launch 6 missiles simultaneously from the two VLS group every 2 second.
About the number of target that they can track: anti air destroyer like Type 055 and Alerigh Burke can track and attacks over 100 targets at the same times so 6 targets shouldn't be a big challenge for them. I mean the aperture area of a shipborne radar like SPY-1, Type 346 is pretty much the same as 68 APG-81 putting together, so you can image their potency
ricnunes wrote:And again don't forget that the missiles that you already detected around 15km in a best case scenario are flying at high speed against your warship! So and with all the above you better have a PK close to 100% (which we can agree that this won't be the case) you else the Destroyer is toasted!
Even when the sea skimming missile is only about 1 meter above the ocean, the radar horizon is 25.5 km, with the subsonic speed of LRASM and JSM, the destroyer have about 83 seconds, that is enough for the destroyer to intercept the missiles group several time over
ricnunes wrote:And guess what?? Neither a Destroyer was designed to single handily engage a volley of several incoming missile
Anti air destroyer such as Alerigh Burke, Type 055 are designed to do exactly that to provide air defense bubble for the battle group
ricnunes wrote:What???
Don't get me wrong but you need to learn much more about naval warfare or else you wouldn't be minimizing the role of the onboard maritime helicopter! It's with a very good reason that the vast majority if not all major modern warships carry onboard helicopters! Did you know that for instance the Type 055 that you're so much praising here carries two (2) of these helicopters including the hangar and facilities to operate them? I would like to see you downplaying the role of a onboard maritime helicopter to a Submarine commander! And I can guarantee you that a Submarine is much, much stealthier than a Skjold!
Nevertheless and about what you said above:
The Skjold is a 'stealthy' (emphasis on the 'y') not a 'stealth' ship. You can't have the same or similar level of stealth on a ship like the Skjold or any other ship for that matter like you have in a fighter aircraft like the F-35. There are several reasons for that including for example the wake that any ship produces on the water which can be detected by radars. For instance:
https://arxiv.org/pdf/1904.03309.pdfMoreover applying the same level of stealth measure on a ship that you apply on a F-35 would probably make the ship (even a small one like the Skjold) cost prohibitive while at the same time being always less stealth than the aircraft (see paragraph above).
On top of all that did you know that Maritime onboard helicopters can also carry FLIR? I'm very sure that a high or higher flying helicopter with a modern FLIR set could definitely detect a Skjold at a considerable long distance. Moreover many helicopters can employ their own weapons including longer range guided missiles which means that in this case the helicopter can even engage and destroy a Skjold without any intervention from the 'mothership' (by the way, another reason why modern and bigger warships are more expensive).
In terms of helicopter endurance, the US, Australian and other navies operate the MH-60R which has an endurance of 3.30 hours which is by no means small like you seem to imply. Here:
https://www.lockheedmartin.com/content/ ... rifold.pdf
And of course there are Navies like Canada or the UK that operate even heavier/bigger helicopters from their warships like the CH-148 and Merlin respectively which have longer range and more endurance than the MH-60R.
Firstly, I didn't try to down play the role of helicopter, I understand they are very important especially for anti submarine and anti mine. I only mentioned that the radar of helicopter will have a hard time tracking a small stealth corvette such as Skjold. Tracking ship movement through wave isn't always doable especially in higher sea stage condition, and to be fair, stealth aircraft also have contrail
Secondly, 3.5 hours endurance is quite short for recon assets
ricnunes wrote:Here, I believe that you're talking about ship versus ship and their respective masts. Well the ship with the higher mast will see the other ship (completely) while the other ship will only see in theory the opposing's ship top part of the mast. Is seeing only the other's ship top part of the mast sufficient for a detection and fire solution? I wouldn't bet on that! Actually claiming otherwise is like saying that a surface warship can easily detect a Submarine's pericope in up position just as well or easily as the submarine with the periscope up can detect the warship which or course is nonsense.
The top part of a destroyer mass only include the 2D surface search radar, the fire control radar is located at much lower height at its center of mass