Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-11-01
1980-06-17
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5SA, 343 9R, G01S 924
Patent
active
042086590
ABSTRACT:
This detection system of the radar type transmits a sawtooth-shaped frequency-modulated centimeter wave. The wave reflected by an obstacle, if any, is received by two fixed receiving antennas, each of these receiving antennas being connected to a circuit for processing the received signal. The phase shift between the waves is a measure for the angle .theta. formed between the path of flight of the aircraft and the straight line which connects the aircraft with the obstacle. Said phase shift is analyzed in an output circuit of the detection device which also comprises a control loop for controlling the amplitude of the beat-frequency signal between the transmitted signal and the received signal, a synthesizing circuit for a signal fan creating a range window by demodulation of the beat-frequency signal by means of the synthesized signal, a Doppler effect tracking loop and a circuit for analyzing the leading edge of the Doppler effect in the demodulated and filtered signal. In the case of an obstacle which is substantially directly in the direction of flight, last-mentioned circuit produces an information which possibly evaluates the information with respect to the angle .theta. and which is already present in the output circuit, in response whereto an alarm circuit becomes operative.
REFERENCES:
patent: 3187328 (1965-06-01), Vetter
patent: 3603990 (1971-09-01), Poirier
patent: 3720949 (1973-03-01), Richter
Berger Richard E.
Tamoshunas Algy
U.S. Philips Corporation
Wilbur Maynard R.
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