John Geare, Supplier to defense subcontractors, continuing independent study of missiles
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The DF ("East Wind") series of missiles, who latest variant for anti-ship operations if the DF21D, is an innovative weapon which knits together various technologies to increase reliability of targeting and probability of a kill. The DF21D s not strictly, or not entirely, "ballistic," meaning an object which is simply thrown along a given trajectory like a cannon ball. If that were so, it could only hit ships which were stationery. It is ballistic during the boost phase of launch and while in sub-orbital flight. But as it approaches the target area, it is maneuvered by various control systems to home on the target, and becomes a "guided" missile. Aside from initial target coordinates programmed before launch, the missile consults with satellite based tracking sensors and any other available data; for example, ground or ship-based radar. In the terminal phase of flight, DF21D itself verifies and locks on to the target, and flies in for the kill. It is this combination of "hand-offs" from ballistic launch, to multi-source guided approach, and finally target verification and terminal lock which makes the weapon very tricky to defeat. So the short answer is that the DF21D could hit a moving ship at sea. In fact, that is what it was designed to do -neutralize the threat of aircraft carriers. But would it work? The defense against weapons of this kind relies on exploiting a "kill chain," which describes the various opportunities to physically knock out the missile or otherwise to co-opt its electronic guidance systems. The obvious weak link in the chain is the very sophistication of the guidance and control systems themselves. For DF21 to be effective, there is a lot that MUST go right; and not just "mostly" right, but "exactly" right - you're going after a moving target, after all. The weapon is heavily dependent on remote guidance, thus its successful engagement of a target requires the creation and maintenance of a network infrastructure; something which at this moment is still under construction and development. The US Navy's "layered" approach to defense is the most viable counter-measure. If detected early enough, when the missile is in its ballistic phase, it may be engaged by an interceptor missile such as the SM-3 and its variants. If engagement fails, then electronic counter measures may be deployed until the incoming DF21 approaches the strike zone, at which point area defense assets are brought into play. These include beamed energy (laser), BAE's new rail gun (now in testing) and such quaint measures as carbon dust clouds which (winds permitting) would mask the target ships. In general, while everything MUST go exactly right for the missile, the defense can be effective even if "almost exactly" right. Quite understandably, the Navy has been inspired by the Chinese to develop creative defense mechanisms, and this inspiration is of long-standing. It is important to note the geo-political context in which this competition occurs. The DF series and variants are land based assets whose principal purpose is control of the sea space off the Chinese coast. Owing to the relatively low cost of hosting and operating the missiles on its own soil, the Chinese may effectively extend their sphere of influence many miles beyond their shores -an area which the United States Navy has traversed for many years with relative impunity. Thus, when the DF is called a "game changer," the game is not just weapons development, but more fundamentally the game of international politics. Hope that helps.
Concordo con quanto scritto da questo utente di quora.
e consideriamo che il missile balistico antinave si aggiunge a tutta la strategia navale cinese che prevede
1 la costituzione di cvbg
2 la diffusione di centinaia di missili cruise antinave sia subsonici che supersonici lanciati da terra nave sottomario e aerei
3 l'implementazione di un network di satelliti sar esm ed elettroottici per sorveglianza oceanica
4 la costuzione di uav simili al global hawk la cui missione principale pare essere la sorveglianza marittima. Dei quali stanno testando due protitipi diversi.