US1981884
patent of
A.H.Taylor et al
System for
detection objects by radio
Application
date 13 June 1933
Granted on 27
November 1934
It was
granted to: Albert H. Taylor, Leo C. Young and Lawrence A. Hyland, Washington D.C.
(Granted
under the act of March 3, 1883, as amended April 30, 1928; 370 O.G. 757)
This patent claim is very
significant, as it concerns velocity detection by means of Doppler modulation,
caused by a moving object. MTI or moving target indication is based on the phenomenon
of 'Doppler modulation' originating from the 'radial velocity' of a moving object.
For quite a long time, was it rather difficult for radar systems, to distinguish
between fixed and moving objects. The Doppler modulated 'video signal' looks, at
an oscilloscope, like the moving wings of a 'butterfly'. The Germans called
these Doppler modulated target patterns 'Laus'. (some versions 'Würzlaus').
Keywords:
This invention relates to a method of and means by
which moving objects in the air or on the surface of the earth may be detected
by the employment of radio receiving and transmitting equipment; The phenomenon upon which this invention operates is based upon the transmission of radio waves
which may or may not be directional, the radiation of those waves by an
intervening object and the reception of the primary, as well as the reradiated
waves by a receiver remotely situated with respect to the transmitter. As will
be shown, the detection of intervening objects is accomplished either by
properly receiving and and interpreting the interference pattern created by the
interaction of the ground waves as sent out from the transmitter and the
reradiated waves from the intervening objects, such as an airplane, moving
vehicle, or vessel, or by eliminating the said groundwaves and adjusting the
receiver to actuation only by the reradiated sky waves ....
Consider also my book on
German: Würzburg
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