SPY-2
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The AN/SPY-2 radar]] is an add-on to the AEGIS battle management system]] radar; it gives new capabilities needed for ballistic missile defense]] that are not part of the basic SPY-1|AN/SPY-1]] main AEGIS radar. It is the engagement control radar for the RIM-161 Standard SM-3 ]] missile. Known as the High Power Discriminator (HPD), it gives long-range detection, tracking and discrimination of advanced theater ballistic missile (TBM) threats.[1] Radar targets associated with such threats are very different in speed, geometry, and distance than the aircraft and cruise missile targets for which AN/SPY-1 is optimized. While it will physically be mounted with the AN/SPY-1 on Burke-class]] or Kongo-class]] destroyer]] or a Ticonderoga-class]] cruiser]], other radars, such as the Army transportable TPY-2|AN/TPY-2]] or the Navy's sea-based X-band (SBX) ship used in BMD development, have some common characteristics. Other electro-optical MASINT#Space-based Staring Infrared Sensors|sensors]], while not radars, complement the BMD mission by detecting launch, such as the present Defense Support Program]] or the future Space-Based Infrared System]] (SBIRS). References
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