Eurofighter Typhoon (UK versions) - Technical data and discussion (Part 2)

since those have photodetectors arrays… yes unless im missing something.
the russians did test out photo detector seekerheads at this time even if other people think they didnt have the tech

This diagram kind of trips me up on the “3rd generation” seeker distinction as well, since afaik, the IRIS-T is the only missile using such a seeker, which makes it a bit odd to dedicate a whole “generation” to one missile.

Its also weird when combined with the earlier source since the IRIS-T is directly stated to be highly resistant to blinding lasers, which makes logical sense as well, since one of the primary methods of defeat for IIR seekers vs DIRCM is the use of HOJ via IR intensity gradient tracking. A scanning array would be capable of the same gradient tracking with the added benefit of being able to blank or skip scanning the point of highest intensity, while also taking advantage of much shorter exposure durations.

I guess the theory of scanning arrays being less resistant could be that there is a risk of the scanning element being damaged while tracking a DIRCM laser, but I’d think any engineer worth their salt would leverage adaptive scan blanking to protect the scanning elements from any emissions that might surpass the threshold at which the scanning elements would be damaged to protect said elements.

IRIS-T seeker view

image

AIM-9X/ASRAAM seeker view

what was the verdict on the typhoon getting hosbo again?

there wasnt any

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Its possible not decided yet.
Maybe next patch when a new eft arrives like some are predicting

Shilling for my suggestion

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Final evolution.
Meanwhile germany with tranche 5 orders xD

Similar upgrade packs all said and done. T2/3 can have anything a T5 could.

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Btw u watch the AMK lecture yet?

Yeah very interesting, focus really is on the improved A2G. Which lines up with how much A2G stores impact EFT flight performance.

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Yeah, initialy planned for the a2a improvment it focused shifzed towards a2g.
The faster implementation newer armament trough the family system is intresting as well.
While it was horribly asked in the lecture.
Would be intresting if heavier a2a loadouts are considered.

I am personaly happy that my question about the functionality of the cannon got answered in combination with the AMK

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I tried asking if considering the graph they provided regarding loadout weights and fore/aft CoG shifts and didnt get an answer cuz of “security reasons”, which is super weird cuz THEY provided the graph, I was just asking if I was understanding it correctly -_-

In theory, 25% more lift should mean higher max takeoff weight, but the graph has me second guessing that…

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How would such a system even work on a missile like IRIS-T? If a 128 x 2 array has to be mechanically scanned from one side to another, how would you blank a section in the middle of that scan? I guess you could have a something like a camera shutter block the aperture during part of the scan, but such a system would probably be very complicated.

Also, if a small cluster of elements in a 128 x 2 array are damaged then you would end up with a dead stripe across the entire image. If a small cluster of elements in a 128 x 128 array is damaged, then theoretically you would just have a dead spot in the image and could use the rest of the array to still track the target. So in that respect a 128 x 128 array would seem to be more damage tolerant.

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That one i dont quite remember.
Just the ignored meteor question was a tad bit to blunt

Its not the array that is scanning mechanically, its a mirror, the linear array is stationary. If the intensity of the returns during the scan is approaching too high a level, you could just have the mirror skip the next few positions as needed before continuing the scan.

Or so is my understanding of how the seeker works and what could theoretically be done for DIRCM protection.

That is the reason why I initially brought up that the theory might be the risk of the elements being damaged, as fewer elements could theoretically mean proportionally increased damage from one or more elements being damaged, I just did a bad job wording it, sorry.

That being said, the time spent being irradiated by the DIRCM “directly” for the elements is much shorter than what a starring array would encounter, so the actual risk of the elements being damaged is also likely substantially lower.

Also, I do once again want to reiterate that I’m not pulling IRIS-T’s resistance to LDIRCM out of nowhere, the manufacturer themselves stated the IRIS-T has “excellent ECM resistance also covering modern blinding lasers” as late as 2018.
image

Do you think tower radar decoy would ever be implemented?

Maybe someday, but were likely pretty far from those still, since we dont even have basic radar ECM capabilities modelled, and even the expendable CM’s we have in-game are super rudementary.

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You can’t just skip positions if the mirror moves linearly across the FOV. If you want to go from one side of the FoV to the other the only way to do so by moving through whatever is between those two points. The mirror can’t just teleport to a new position. I guess you could speed up the scanning of the sections you want to avoid, but considering the thing is already scanning 80 times a second getting it to speed up and slow down without messing up the image processing for the rest of the frame is no small engineering task.

I’m sure the IRIS-T is resistant to LDIRCM, what I’m less sure of is if it is meaningfully better than any other IIR missile.

Where’s that from by the way? In this video the seeker image quality of IRIS-T looks pretty terrible compared to ASRAAM images you shared:

Simple: A Shutter. The shutter is closed while the optics move to the next line to scan. Instead of opening on a line it keeps being closed for the one line in question and opens only at the line after that.

With a Focal Array like the ASRAAM or AIM-9X (128x128 pixels) you can’t do that.

You can though, the same way you deal with the sun; the smaller the aperture in the optical train the less light from the scene get though to the detector array so you minimize what you can see, or use the optical train to deliberately defocus the image on the detector or you use the very low gain Sun-Staring detection diode.

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