Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-03-06
1976-07-06
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343109, G01S 116, G01S 118
Patent
active
039684954
ABSTRACT:
An aircraft instrument landing system for use on an aircraft runway to guide approaching aircraft along a glide path comprising in combination first and second directional transmitters to be disposed on the left and right sides of a runway for transmitting radio signals which will overlap including a high frequency oscillator complex for supplying a high frequency output carrier signal from each transmitter and modulator means for each transmitter supplying a pair of different identifiable modulation signals for each transmitter. Each transmitter defines a "reference plane" which is inclined to the horizontal in such a manner that the intersection of the two reference planes defines a desired glide path. Receiver means on the aircraft are disposed to receive said carrier signals and including narrow band pass filter means for separating the four identifiable modulation signals, detector means coupled to said filter means including resistor divider means to adjust the intensity of said signals and means to add and subtract the received signals, and, display means coupled to said detector means and including indicator means visibly indicating the position of the aircraft relative to a phantom glide slope reference plane, a phantom azimuth reference plane and visibly showing the signal displacement from said planes, and means to control the angle of the phantom glide slope reference plane at the receiver in the aircraft.
REFERENCES:
patent: 3908189 (1975-09-01), Buehler
Berger Richard E.
Oujevolk George B.
Wilbur Maynard R.
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