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U22 ECM Effects


MBot

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I did a few tests of the U22 jammer pod and thought I would share the results. The test setup was as follows: AI Viggen approaching naval based Osa SAM system at 500ft and 420 KTAS. AI set to not evade and had all chaff removed. I did only consider the first SAM shot at maximum range. Follow up shots at closer ranges resulted in considerably increased SAM effectiveness.

 

Test 1: No jammer. First SAM launch at 6.5 NM. 10 hits out of 10 first SAM launches.

 

Test 2: U22 jammer, AI set to jam when locked up. First launch at 6.5 NM. 7 hits out of 10 first SAM launches.

 

Test 3: U22 jammer, AI set to always jam. First launch at 6.2 NM. 8 hits out of 10 first SAM launches.

 

Test 4: Aircraft with no jammer, followed by aircraft with U22 jammer following 1.5 NM behind. Jamming aircraft set invisible to ensure engagement of lead aircraft. First launch at 6.6 NM. 6 hits out of 10 first SAM launches.

 

Test 5: 4 aircraft with U22 jammer in close formation, set to always jam. First launch at 6.6 NM. 10 hits out of 20 first launches.

 

 

The number of tests is too low to produce precise probabilities, but I think we can see some interesting trends:

 

Jamming on radar lock does not reduce launch range compared to no jammer. Always jamming does reduce launch range, though only very slightly. Oddly, multiple aircraft jamming simultaneously seem to increase launch range compared to no jamming.

 

More significantly, jamming causes about 25% of the missiles to miss even non-maneuvering targets. Aircraft without a jammer apparently also profit from the protection of nearby jamming aircraft. Jammer escorts actually work.

 

I am not sure if multiple aircraft close together decreases SAM hit rate, or if the improved protection (50%) is due to the increased range (for whatever reason the launch range is increased in this setup).

 

I am not sure how far-reaching tactical implications this has, as these numbers only represent the first SAM salvo. At closer range the protection from jamming seems to fall off rapidly. And even for the first shot, I am not sure how much you can depend on a 25% chance of not getting killed provided by an escort jammer.

 

Still, an interesting subject.

Viggen_ECM.miz

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  • 2 weeks later...
Jamming and burnthrough in DCS is unfortunately quite simplistic and we can't really do much about this. For the most part, it's just a multiplier to the ranges of affected radars.

 

Is there a different modifier between the different systems, from what i've deduced the U22 & U22A is devastating to older non-monopulse radar like the ZSU SA-3 etc which it can totally mislead.

With monopulse radars like the SA-8 and newer the best it can do is create a bunch of jamming pulses and hope the radar crews don't figure out which one is the aircraft.

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