FIGURE 5-15 Notional defended footprint of North Korean depressed trajectories.

Shariki FBX for over 100 sec and then by the SBX at Adak, Alaska, and in some cases by the GBX at Clear, Alaska. The coverage afforded by lofted trajectories from North Korea is shown in Figure 5-14. The two sites easily provide SLS coverage of all of North America against lofted threats from North Korea. Figure 5-15 shows the coverage against North Korean depressed trajectories. Here, most of northwest Canada is protected, but the coverage of Alaska is reduced by the short time of flight and the shallow trajectories, making defense of the FGA site less robust than might be desired.

It should be noted, however, the committee’s analysis shows that notional interceptors with a fly-out velocity of 4.3-4.5 km/sec that are ship-based in the northern Sea of Japan with engage-on-remote capability from the Shariki FBX would be capable of an additional early shot for North Korean threats to Alaska.

Layered Interceptors

Layered sensors with the ability to provide almost continuous ICBM target track from launch to near impact give rise to layered deployment interceptors. Using the sensor configuration discussed above, a hypothetical interceptor basing concept is added to examine the propects of developing a layered missile defense system capable of SLS engagements in all phases of the ICBM trajectory, from early ascent to near apogee and beyond apogee to near the bottom of the battle

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