how could aegis deal with targets which are under horizon?

tphuang said:

right, you know it would be nice if you actually have some sources to back this up. Most sources state 500m for HQ-9. I don't know if it's true or not, but that's all that is available. Until further information is available, I'd have to use it.

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there won't be reliable resource coz PLA never publish information about their weapons.

vincelee said:

the biggest weakness in toothbrush's argument, and one which you did not exploit, is that since HQ-9 is active (assumed) in terminal stage, you have to take ambient interference into account.

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HQ-9 still keep the semi-active tracked ability though there is only one illuminator on 052c.

tphuang said:

the minimum altitude of the missile depends on several factors.
1. the detection range of the radar at low altitudes
2. the ability of the active seeker in look down mode

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1.there should be other sensor units support through datalink. ship based radar's low altitude detection ability is not important.

2.active seeker radar is a successive-pulse radar. to look down is easier for it even than to look forward coz it can easily reconize the difference between surface's reflection waves and targets' reflection waves. SAM's targets all are high speed objects. once they have perpendicular-relative speed with seeker radar's antenna, reflection wave frequency shift would happen. it would make the targets' reflection signal so different from the background's and seeker thus easy to catch the low altitude targets.