It looks like deceleration missiles before hit is Sonalysts work.
I've made some tests:
AEGIS TEST - RA 1.46
and...
AEGIS TEST - vanilla 1.04
Missiles behaviour:
SM-2 USNI speed is 1932 kts but...
1. To half way of interception, missiles increases speed from 1000 kts up to 1700 kts
2. after this moment missiles decreases speed to 1540 kts
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