The AN/SPS-40 was a ship-based, long-range air search radar which was developed by Lockheed Corporation for the US Navy, and later manufactured by the firms Sperry Corporation, Westinghouse, and Norden Systems. Introduced in the 1960s, the AN/SPS-40 was a 2-Dimensional, solid state radar that provided target detection, contact bearing, and fire control system designation. It also featured low vulnerability to Anti-Radiation Missiles, imperviousness to weather clutter and chaff, and excellent range resolution for multiple missile raids. It was used on Spruance-class destroyers, Belknap-class cruisers, Leahy-class cruisers, Knox-class frigates, Bronstein-class frigates, Hamilton-class cutters, Raleigh-class amphibious transport docks and many other ship classes. The SPS-40 was replaced by the AN/SPS-49 on newer ships and on ships that received the New Threat Upgrade.
Variants: AN/SPS-40, which was the first model developed and built by Lockheed; AN/SPS-40A, which was an upgraded version produced by Sperry; AN/SPS-40B, with an integrated IFF-System; AN/SPS-40C, which had an improved tracking detection and electronic counter-countermeasures capacity; AN/SPS-40D, which was a further upgraded version of the A model manufactured by Westinghouse; AN/SPS-40E, which was a variant produced by Norden System by later cancelled by the US Navy.
Specifications for the AN/SPS-40
Type: 2D Air-search
Frequency: 400 MHz, UHF band
Performance: 200 - 250 kilowatts
Range: 230 miles (370 km)
Diameter 140" x 214"
Elevation: vertical beam width 19°
Precision: horizontal beam width 10.5°