Moderadores: Lepanto, poliorcetes, Edu, Orel
Aegis For The Masses
September 13, 2009: U.S. defense electronics firm Raytheon has developed a radar that will incorporate a lot of the phased array technology pioneered by the Aegis system (used in warships.) The new Raytheon SPY-5 could be described as "Aegis Lite" (it can be used in smaller ships, of under 1,000 tons displacement). The SPY-5 (SPY-1 is Aegis, SPY-2 is the anti-missile version of Aegis, while . SPY-3 and 4 are for the new DDG-1000 destroyer) is, in effect a smaller version of SPY-3, which was also designed to replace five different types of radars. In effect, SPY-5 takes care of air and surface search, plus fire control, and anything else you need radar for. The smaller (than SPY 1-3) uses only three flat phased array surfaces to cover all around the ship. The SPY-5 was also designed to be compatible with existing power supplies and electronic systems in Western ships. With SPY-5, Raytheon is trying to bring "Aegis technology" to the masses.
There over a hundred Aegis equipped warships. Aegis was new and expensive, but potentially revolutionary, when it entered service three decades ago. It was a powerful, 3-D radar. It used phased array technology, where the radar consisted of thousands of tiny radar transmitters, that could be electronically aimed in different directions. Aegis can track over a hundred targets, nearly 200 kilometers from the ship. Aegis was more than just a radar system, it was a tightly integrated combat system that gave the captain unprecedented "situational awareness" of what was around the ship (in the air, on the surface, and under water.) The Aegis radar not only tracked targets, but controlled Standard anti-aircraft missiles for long range shots, until the missiles onboard radar could pick up the target and destroy it. The phased array radar was more difficult to jam and, in general, was way ahead of what any other navy has, and it still is. The latest version of Aegis and Standard missiles can shoot down ballistic missiles and low orbit space satellites.
Development on Aegis began four decades ago, and in 1973 the first seagoing Aegis radar (for testing purposes) was at work. Ten years later, the first Aegis equipped warship, the cruiser USS Ticonderoga, entered service (and was decommissioned 31 years later).
Shooting Down Aircraft With Torpedoes
September 17, 2009: Once more, developers are working on weapons that enable submerged submarines to attack aircraft overhead. There was recent successful test of the U.S. Tomahawk Capsule Launching System (TCLS) releasing a AIM-9X Sidewinder air-to-air heat seeking missile. This is all part of an effort that began during the Cold War, particularly for non-nuclear subs. While most of this work halted when the Cold War ended in 1991, it has since been resumed.
Last year, for example, Germany successfully tested launching anti-aircraft missile from a submerged submarine (U-33, a Type 212 equipped with Air Independent Propulsion). The IDAS (Interactive Defense and Attack system for Submarines) missile used is 7.6 feet long, 180mm in diameter and weighs 260 pounds. It has a 29 pound warhead and a range of at least 15 kilometers. The main targets are ASW (Anti-Submarine) helicopters and low flying ASW aircraft. Two IDAS missiles fit into a metal frame that in turn fits into a torpedo tube. The IDAS missiles take about a minute to reach the surface, ignite its rocket motor, spot any target within range and go after it. If the IDAS misses, an air bubble from the torpedo tube launch of the missile, will reach the surface, indicating where the sub is. At that point, the helicopter or aircraft can drop a torpedo. The sub has countermeasures for these torpedoes, but these devices are not guaranteed to work every time, or against every type of torpedo (some are better at detecting, and getting around, countermeasures.) So using something like IDAS, or TCLS, is a gamble.
The sub commander would use IDAS if he calculated that a helicopter was likely to spot him with active sonar sonobouys or dipping sonar. IDAS can also be aimed at a surface ship (as in the bridge or a helicopter sitting on the platform at the rear of the ship. This is done using the fiber optic link, which can use used to designate a target. Otherwise, the missile uses its heat seeking sensor.
IDAS is a year or two away from availability, but it's uncertain if any navy will buy them. A similar system to IDAS (Triton), was developed in the 1990s, but never entered service. IDAS is a continuation of this. The concept of anti-aircraft missiles for subs is several decades old, and never actually used. But it's possible, so new models keep showing up.
Sabre escribió:Que yo sepa, la unica vez que se hizo no fue en Vietnam, fueron unas pruebas que se hicieron en el Forrestal en 1963.
http://www.theaviationzone.com/factshee ... restal.asp
http://www.youtube.com/watch?v=ar-poc38C84
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