Japan Embracing Missile Defense
Published: Wed Apr 5th, 2006Source: www.armscontrol.org
Several years of U.S.-Japanese cooperation on anti-missile systems bore fruit in a successful experiment March 8. The test marked an important milestone in the two countries' collaboration as Japan expands its missile defense activities and has emerged as the leading overseas missile defense partner of the United States . Japan began its foray into missile defenses in 1999 with research on four components for a ship-fired missile interceptor. Now, Tokyo is preparing to host an advanced U.S. missile tracking radar, develop a more powerful missile interceptor with the United States, and deploy the initial elements of a Japanese land- and sea-based missile defense system.
The March 8 test involved one of the four products of the initial U.S.-Japanese partnership. In the experiment, a U.S. Standard Missile-3 (SM-3) interceptor 88 kilometers above the Pacific Ocean employed for the first time a Japanese-designed “clamshell” nosecone. In an actual missile intercept attempt or test involving a mock warhead, the nosecone would release a kill vehicle to collide with a target hurtling through the atmosphere. But in this case, only a telemetry device to gather data on the new nosecone’s operation was released. U.S. nosecones require the SM-3 to conduct maneuvers to eject the kill vehicle; the Japanese nosecone avoids the need for maneuvers by opening up like a clamshell.
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