history of radar - purdue university
TRANSCRIPT
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History of Radar
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Heinrich Rudolf Hertz
http://en.wikipedia.org/wiki/Heinrich_Rudolf_Hertz
1887 experimental setup of Hertz's apparatus
History of RADAR
Germany
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http://www.design-technology.info/inventors/page28.htm
Huelsmeyer’s ‘Telemobiloscope, 1904
Christian Huelsmeyer
History of RADAR
Germany
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Guglielmo Marconi
History of RADAR
Marconi
operating
apparatus
similar to that
used by him to
transmit first
wireless signal
across Atlantic,
1901.
Marconi watching associates raising the
kite (a "Levitor" by B.F.S. Baden-
Powell[22]) used to lift the antenna at St.
John's, Newfoundland, December 1901
http://en.wikipedia.org/wiki/Guglielmo_Marconi
Italy
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History of RADAR
April, 1935: British Patent for Radar System for Air Defense
Granted to Robert Watson-Watt
Robert Watson Watt
England
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Battle of Britain, 1940
History of RADAR
England
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Albert Hoyt Taylor (January 1, 1879 in Chicago, IL –
December 11, 1961 in Los Angeles, CA.)
First continuous wave (CW)
interference detector, 1922.
History of RADAR
USA
On 15 March 1934, Dr. Hoyt Taylor, head of the
radio division at Naval Research Laboratory (NRL),
put into motion a project to develop pulse radar
for the detection of ships and aircraft.
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Notice the large square radar antenna on the USS New York, 1938.
Pulse radar
History of RADAR
USA
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RADARRAdio Detection And Ranging
Target
R
The system measures a delay
c
Rt
2=∆
Transmitting and receiving
antenna
distance
Speed of light
delay
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Range resolution
RADAR
with shorter pulses, closer targets can be distinguished
technical limitations for generating very short pulses
pulse duration targetsnot resolved
targetsalmost resolved
targetsresolved
τ Pulse duration
2
τcrR
=Range resolution
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Resolution in azimuth
RADAR
ant
ant
l
λθ =
antl
Rl
x
ant
λ=
Azimuth resolution
The radar by itself is a MONO Dimensional
instrument
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RADARCommon screen of a rotating radar