Westinghouse AN/FPS-27 Radar

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AN-FPS-27 Radar.jpg
Westinghouse AN/FPS-27 Radar
Country of origin United States
Introduced 1963 (1963)
Type Surveillance and Height Finding
Frequency 2322 to 2670 MHz
PRF selectable between 226 and 288
Pulsewidth 6.5 micro seconds
Range 220 nmi (410 km; 250 mi)
Altitude 150,000 ft (46,000 m)
Power 15,000,000 Watts peak; 30,000 Watts average

The AN/FPS-27 Radar was a Long Range search radar used by the United States Air Force Air Defense Command.

Westinghouse built a Frequency Diverse (FD) search radar designed to operate in the S-band from 2322 to 2670 MHz. The radar was designed to have a maximum range of 220 nmi (410 km; 250 mi) and search to an altitude of 150,000 ft (46,000 m).

System problems required several modifications at the test platform located at Crystal Springs, Mississippi. Once these problems were solved, the first of twenty units in the continental United States became operational at Charleston, Maine, in 1963. The last unit was installed at Bellefontaine, Ohio, a year later. All AN/FPS-27 radars were installed at sites which had AN/FPS-6, AN/FPS-26, or AN/FPS-90 height finder radars. The 3-D functionality of the AN/FPS-27 was not available to the AN/FYQ-47 Common Digitizer for use in the Semi-Automated Ground Environment (SAGE) system.

The 3-D functionality was possible through the use of a "vertically stacked beam" radiating feedhorn into the parabolic reflector. The received radar return was detected in a single or adjacent feedhorn which the radar receiver calculated a relative position in elevation.

In the early 1970s, AN/FPS-27 radar stations that had not been shut down received a modification (solid state receiver circuitry replacing vacuum tubes) that improved reliability and saved on maintenance costs. The upgraded radars were designated AN/FPS-27A.


 This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency.

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