ECM slot

[broncepulido]

6 hours ago, jugasa77 said:

So if we have an ECM of 10% and chaff of 20%, it counts a total of 20% (the higher value), isn't it?

Yes, just that.

[broncepulido]

16 hours ago, jugasa77 said:

So if we have an ECM of 10% and chaff of 20%, it counts a total of 20% (the higher value), isn't it?

Yes. it is.

[TonyE]

Looking at an escort jamming example where a Prowler is trying to prevent a Bear from localizing some Tomcats:

105616 Search.c:1307 -     Unit EA-6B Prowler ICAP II, lngECMRange = 1000
105616 Search.c:1590 -     ECM Escort ECM=0, ECMTmp=0, ECMTmpE=0, RadRng=230, JamRng=100, JamRadRng=266, TarRadRng=221, JamTarRng=46
105616 Search.c:1637 - ECM ECMRadRng=266, ECMTarRng=46, ECMTarRngTmp=0, RadTarRng=221, ECMRng=100, RadRng=230, Rng50=48, ECM=0, ECMTmp=0, ECMTmpE=0
105616 Search.c:1650 - ECM Emitter=Tu-95RT Bear D, Target=F-14B Tomcat, ECM=EA-6B Prowler ICAP II

Bear's radar max range is 266nm, Prowler ECM max range is 100nm, Bear is 221nm from Tomcats, Prowler is 46nm from Tomcats, Prowler is 266nm from Bear

The ECM isn't providing any benefit to the Tomcats in this case indicated by ECM=0

 

Here is a case where a Flanker radar's range is reduced 6% vs some missiles thanks to a Prowler:

105641 Search.c:1307 -     Unit EA-6B Prowler ICAP II, lngECMRange = 1000
105641 Search.c:1565 -     ECM Direct ECM=0, ECMTmp=6, ECMTmpE=0
105641 Search.c:1590 -     ECM Escort ECM=0, ECMTmp=6, ECMTmpE=0, RadRng=65, JamRng=100, JamRadRng=78, TarRadRng=32, JamTarRng=68
105641 Search.c:1637 - ECM ECMRadRng=78, ECMTarRng=68, ECMTarRngTmp=0, RadTarRng=32, ECMRng=100, RadRng=65, Rng50=49, ECM=6, ECMTmp=6, ECMTmpE=0
105641 Search.c:1650 - ECM Emitter=Su-27S Flanker B, Target=missile, ECM=EA-6B Prowler ICAP II

[broncepulido]

On 1/3/2024 at 10:57 AM, jugasa77 said:

I wish chaff were compatible with ECM, and flares with IR jammers.

Which is the "residual probability to hit"?

Here, at last, an example of "residual probability to hit", reduced to only 1% probably because a heavy ECM environment (It was very near a EA-6B with an ALQ-99F ICAP II  ECM pod rated in this case to 50% (in fact rated to 25%, see the two post after this), and the SA-3b rated to 20% PH. I think 20-25=-5, but remaining a "positive" 1% of "residual" probability of hit, a good idea for me). Read the last line report on the image:

[broncepulido]

Just a first time, I see in the same action the "residual" PH of two SA-3b missiles is 2%, see the first line:

[broncepulido]

I see also as very interesting point, the ECM pod value is in fact HALVED from 50% to 25%.

See the fourth line, SA-6a PH=30%, ECM pod value 25% (halved in relation to the 50% value script in the DB), final value of PH=5%, as three missiles launches against the same single AGM-78 Standard ARM, the final probability is trebled to 15% (edited the first post now):

[donaldseadog]

Thinking about hit probability is for me like walking in a mine field.

Once you get down to those low Ph No matter how many  sticks you throw it is unlikely to do any good.

If you think two missile with Ph of 50%, you don't have a 100% prob of hit. From memory the correct calculatin is to work out the prob of a miss for each then calculate as exponential of the number of missile to get the prob of all missing, then the flip of that is the prob of a hit. Thus for a 50% Ph and 2 missile the prob of all missing is .5 x .5 = .25, meaning 75% prob of a hit? But I can easy be wrong as it a little while since I did this math.