gogbot
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There is no system in the planet to destroy a missile if its mirved whether it is IRBM or ICBM.
Its not so simple. AMB systems become useless because they can be overwhelmed in numbers. AMB systems can still take on MIRV warheads given that they do not get overwhelmed.
By the early 1960s, US research on the Nike Zeus missile system (see Project Nike) had developed to the point where small improvements would allow it to be used as the basis of a "real" ABM system. Work started on a short-range, high-speed counterpart known as the Sprint to provide defense for the ABM sites themselves. By the mid-1960s, both systems showed enough promise to start development of base selection for a limited ABM system dubbed Sentinel. However, due to political debate, Sentinel never expanded beyond defense of missile-bases.
An intense debate broke out in public over the merits of such a system. A number of serious concerns about the technical abilities of the system came to light, many of which reached popular magazines such as Scientific American. This was based on lack of intelligence information and reflected the American nuclear warfare theory and military doctrines. The Soviet doctrine called for development of their own ABM system and return to strategic parity with the US. This was achieved with the operational deployment of the A-35 ABM system and its successors, which remain the only operational ABM systems.
As this debate continued, a new development in ICBM technology essentially rendered the points moot. This was the deployment of the Multiple Independently targetable Reentry Vehicle (MIRV) system, allowing a single ICBM missile to deliver several warheads at a time. With this system the USSR could simply overwhelm the ABM defense system with numbers, as the same number of missiles could carry ten times more warheads. Upgrading it to counter the additional warheads would cost more than the handful of missiles needed to overwhelm the new system, as the defenders required one rocket per warhead, whereas the attackers could place 10 warheads on a missile with more affordable cost than development of ABM. To further protect against ABM systems, the Soviet MIRV missiles were equipped with electronic countermeasures and heavy decoys, with heavy missiles like R-36 carrying as many as 40 of them. These decoys would appear as warheads to ABM, effectively requiring engagement of 50 times more targets than before and rendering defense ineffective.
ABM systems are still capable of providing defense
Missile defense categories
Missile defense can be divided into categories based on various characteristics: type/range of missile intercepted, the trajectory phase where the intercept occurs, and whether intercepted inside or outside the Earth's atmosphere:
Classified by type/range of missile intercepted
The types/ranges are strategic, theater and tactical. Each entails unique requirements for intercept, and a defensive system capable of intercepting one missile type frequently cannot intercept others; however there is sometimes overlap in capability.
* Strategic missile defense: Targets long-range ICBMs, which travel at about 7 km/s (15,700 mph). Example of currently active systems: Russian A-135 system which defends Moscow, and the U.S. Ground-Based Midcourse Defense system that defends the United States. Geographic range of strategic defense can be regional (Russian system) or national (U.S. system).
* Theater missile defense: Targets medium-range Theatre ballistic missile, which travel at about 3 km/s (6,700 mph) or less. In this context the term "theater" means the entire localized region for military operations, typically a radius of several hundred kilometers. Defense range of theater defensive systems is usually on this order. Examples of deployed or soon-to-be deployed theater missile defenses: THAAD, Airborne laser and Russian S-400 Triumf.
* Tactical missile defense: Targets short-range tactical ballistic missiles, which usually travel at less than 1.5 km/s (3,400 mph). Tactical ABMs have short ranges, typically 20-80 km (12-50 miles). Example of currently-deployed tactical ABM: MIM-104 Patriot, S-300V.
Classified by trajectory phase
Ballistic missiles can be intercepted in three regions of their trajectory: boost phase, midcourse phase or terminal phase.
* Boost phase: intercepting the missile while its rocket motors are firing, usually over the launch territory. Advantages: bright, hot rocket exhaust makes detection, discrimination and targeting easier. Decoys cannot be used during boost phase. Disadvantages: difficult to geographically position interceptors to intercept missiles in boost phase (not always possible without flying over hostile territory), short time for intercept (typically about 180 seconds). Example: aircraft-mounted laser weapon Boeing YAL-1 (under development).
* Mid-course phase: intercepting the missile in space after the rocket burns out. The coast period through space before reentering the atmosphere can be several minutes, up to 20 minutes for an ICBM. Advantages: extended decision/intercept time, very large geographic defensive coverage, potentially continental. Disadvantages: requires large/heavy anti-ballistic missiles, sophisticated powerful radar often augmented by space-based sensors, must handle potential space-based decoys.
* Terminal phase: intercepting the missile after it reenters the atmosphere. Advantages: smaller/lighter anti-ballistic missile required, balloon decoys won't work, smaller, less sophisticated radar required. Disadvantages: very short reaction time, possibly less than 30 seconds, less defended geographic coverage. Possible blanketing of target area with hazardous materials in the case of detonation of nuclear warhead(s).
Classified by intercept location relative to the atmosphere
Missile defense can take place either inside (endoatmospheric) or outside (exoatmospheric) the Earth's atmosphere. The trajectory of most ballistic missiles takes them inside and outside the Earth's atmosphere, and they can be intercepted either place. There are advantages and disadvantages to either intercept technique.
* Endoatmospheric anti-ballistic missiles are usually shorter ranged. Advantages: physically smaller/lighter, easier to move and deploy, endoatmospheric intercept means balloon-type decoys won't work. Disadvantages: limited range and defended area, and limited decision and tracking time for the incoming warhead. Example: MIM-104 Patriot and Advanced Air Defence.
* Exoatmospheric anti-ballistic missiles are usually longer ranged. Advantages: more decision and tracking time, larger defended area with fewer missiles. Disadvantages: larger/heavier missiles required, more difficult to transport and emplace than smaller missiles, must handle decoys. Example: Ground-Based Midcourse Defense and Prithvi Air Defence.
Some missiles such as THAAD can intercept both inside and outside the Earth's atmosphere, giving two intercept opportunities.
Given the fact they are not overwhelmed, by numbers. and AMB systems are capable of differentiating decoys. from real warheads.
Or
Early warning rads and sensors are in place to take down the missiles before reentry.
what the real challenge for AMB systems is
The maneuverable reentry vehicle (abbreviated MARV or MaRV) is a type of nuclear warhead capable of shifting targets in flight. Refer to atmospheric reentry.
There are several types, of which examples include:
* the version designed for the Trident missile, which had to be able to evade Soviet anti-ballistic missile systems.
* the active radar terminal-guidance version with pinpoint accuracy for the MGM-31C Pershing II missile
* the high hypersonic land-based anti-ship ballistic missile variant of the DF-21
* the warheads used by the Russian Topol-M missile which are designed to defeat any US ABM systems.
Although in full scale conflict Any current AMB system can be overwhelmed. in sheer numbers
Its existence ensures that Your nation is not held hostage by rogue groups, who may have acquired scuds and Nukes.
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