Strategy Page looks at the anti-missile system Israel has been using to combat Hamas rocket attacks:
Israel has bought seven batteries of Iron Dome anti-rocket missiles. Four are in action and a fifth one entered service several weeks early (on November 17) because of the major rocket assault Hamas and other Islamic terror groups in Gaza launched on November 14th. Over 500 rockets were launched during the first two days, but then the number began to decline. On Saturday (the 17th) 230 rockets were fired, with only 156 on Saturday and 121 on Monday. While the Palestinians have fired over a thousand rockets into Israel so far, and killed three Israelis, their effort is faltering and the Israeli response is not. Few of the rockets landed in occupied areas. That’s because Iron Dome has been able to detect and destroy 90 percent of the rockets that were going to land in an area containing people. The Israelis military says they have shot down over 300 rockets so far.
Iron Dome uses two radars to quickly calculate the trajectory of the incoming rocket and do nothing if the rocket trajectory indicates it is going to land in an uninhabited area. But if the computers predict a rocket coming down in an inhabited area, guided missiles are fired to intercept the rocket. This makes the system cost-effective. That’s because Hezbollah fired 4,000 rockets in 2006, and Palestinian terrorists in Gaza have fired over six thousand rockets in the past eight years and the Israelis know where each of them landed. Over 90 percent of these rockets landed in uninhabited areas and few of those that did hit inhabited areas caused casualties. Israel already has a radar system in place that gives some warning of approaching rockets. Iron Dome uses that system, in addition to another, more specialized, radar in southern Israel.
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Since Hamas is a big believer in using civilians as human shields (often against their will), a ground campaign would get a lot more Palestinians killed. So the attacks against specific terrorist leaders are seen as the better option. Even this risks civilian casualties, because Hamas puts its government and military facilities in residential neighborhoods. It has also, on the advice of its Hezbollah advisors, built rocket launchers near mosques, schools, hospitals and residences. The Israelis have distributed lots of videos of Palestinian rockets being fired in this way. Still most Arab and some Western media keep maintaining that Israel is at fault for defending itself, or simply existing.
This latest war with the Palestinians has been a major test for the Iron Dome system. Each battery has radar and control equipment and four missile launchers. Each battery costs about $37 million, which includes over fifty Tamir missiles (costing $40,000 each). In the two years before this month Iron Dome had intercepted over 100 rockets headed for populated areas. In the last week Iron Dome has intercepted at least another 300 rockets.
