a website collaboration between Science Service and the Smithsonian Institution

1960 - monitoring the Frescan radar George W. Catlin, Radarman third class, and Richard M. Gallagher, Radarman third class


E&MP 103.035

Radar - 3-D

December 6, 1960

FRESCAN DISPLAY -- Three-dimensional information (range, bearing, altitude) on many aircraft is displayed on these two scopes in combat information center of missile cruiser USS Galveston.

Displays are part of Frescan radar system developed and produced for the Navy by Hughes Aircraft Company.

Target bearing is shown on plan position indicator, left, and range and height on scope at right.

Monitoring the system are George W. Catlin, Radarman third class (left), and Richard M. Gallagher, Radarman third class.

Original Caption by Science Service
© Carl Byoir & Associates, Inc. - Hughs Aircraft Company

Additional Information

. . . SPS-52C was designed by Hughes, the developers of the FRESCAN (Frequency Scan) 3D radar concept. This is where a radar steers a pencil beam in elevation by varying the frequency of the transmitted RF. The antenna of a FRESCAN radar is a stack of slotted waveguides, specifically designed to take advantage of the fact that the direction of the beam out of a slotted waveguide depends on the frequency. This is known as the Squint Angle effect . . .

2 pages 45 KB requires Adobe Acrobat Reader
Courtesy:Norman Friedman and Andrew Glina

. . . A method of providing a 3-D display from the US Navy Frescan or US Army Frescanar 3-D electronic scanning radars has been developed as a private venture by Hughs Aircraft. Missile cruisers and destroyers and the Army Missile Master system already emply the radars, but operators at present watch separate plan-position and height displays . . .

1 page (highlighted) 343 KB requires Adobe Acrobat Reader
Courtesy: FLIGHT May 4, 1961, page 598

National Museum of American History


Search - Site Map - Subjects to Choose From - Numbering Format

Credits - Copyright - Comments