ELECTRONIC SCANNING RADAR
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
. . . 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 . . .
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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
. . .
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Courtesy: FLIGHT May 4, 1961, page 598