AIM-7M sparrow & the RWR
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@A.S:
Probably an improvement in the CD indexies (drag) due to CFD simulations, hence more range at higher altitutes and maybe not so easy avoidable with that “RWR 10 o´clock head-on dodging” anymore … just my guess
PS: at 6-8nm (if RP5 manaul is valid still) would indicate the moment of where the missile switches to independent or goes terminal, thus it would make sence to be “confuse-able” at that moment. But keep in mind, that at RP5 times there were no MPRF or HPRF stages introduced.
i dont think its to do with the PRF mode switch, but the mathematics of the seeker and RCS modelling etc.