From what I know, the HQ-15 being a reverse engineered S-300 is largely a myth. See this from 扬基 of the Trio. @somePLAOSINT's also provides a good explanation as to why in English.
PLA Anti-Air Missile (SAM) systems
- Thread starter FORBIN
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Are there any specifications for HQ-26? I heard that its capabilities will be similar to the SM-6 missile. But I don't remember the source.
I doubt if it would be that comparable to SM-6. SM-6 predominately engages aerodynamic targets and thus lacks the thermal shielded KKV with an actively cooled IR seeker required for high altitude engagement.
If this is sth like what we think HQ-26 is, it will be similar to a "boosted THAAD" proposed for naval use. HQ-19 but with higher burnout velocity perhaps.
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Main problem for sm-6 isn't seeker(you absolutely can do abm with ARH; IR is just braindead better/simpler against space background), it's that it's a through and thorough aerodynamic weapon.
It is just sluggish/imprecise in upper atmosphere, on top of being armed with a rather suboptimal warhead. It limits outer boundaries of intercept window(range, altitude), and limits pK.
active radar guidance alone is ineffective at intercepting high-speed targets outside the atmosphere.
Well yes I should be more specific. Ofc, there are a bunch of ARH ABM missiles around, they are just not the kind of endo/exo-atmospheric interceptor HQ-19 is.
Not sure about the marinized/naval THAAD label there, it looks more like the "boosted THAAD" in the image below, while the navalized THAAD is a bit smaller without those fins.
Looks like the new airdropped ifv has a air defense version with FK-3000/fk2000 missle
And airdropped version of the sws3
And airdropped version of the sws3