![]() The SPY-1D also provides mid-course guidance for the SM-2 missile, and has also demonstrated a capability to track theater ballistic missiles. The SPY-1D radar system is the multi-function, phased-array, three-dimensional (range, altitude, and bearing) radar which conducts search, automatic detection, and tracking of air and surface targets. The third variant of this radar, known as the Littoral Warfare Radar, will improve the radar's capability against low-altitude, reduced radar cross-section targets in heavy clutter environments and in the presence of intense electronic countermeasures. V) littoral radar upgrade will supersede the SPY-1D in new-construction ships beginning in FY 1998, and will deploy in DDG 51 Flight IIA ships starting in approximately 2003. The SPY-1D(V) radar upgrade is the newest improvement to the SPY-1D. The SPY-1F, on the other hand, has not been designed to provide TBMD capability through software and hardware modifications. By virtue of its size, SPY-1D is a more powerful radar and, consequently, has increased range, but both the SPY-1D and the SPY1-F have air defense and ship self-defense capabilities. Spain's F-100 program was the first application of the SPY-1F AEGIS system for frigates, which are smaller than the large guided-missile cruisers and destroyers that were previusly the only vessels with AEGIS systems.
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