Radar system for detecting approaching vehicles from behind

Details Radar system for detecting approaching vehicles from behind Radar system for detecting approaching vehicles from behind

1978-08-23

1980-08-12

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

180286, 343 5NQ, B60R 2100, G01S 742, G01S 944

Patent

active

042175828

ABSTRACT:
A radar system of the invention transmits a series of microwave burst energy backwardly of stationary vehicle to receive a return signal. When the return signal occurs within a preset time interval, a first and second Doppler signals are derived by mixing the return signal with first and second locally generated oscillations having a phase difference therebetween so that there is a varying phase difference between the first and second Doppler signals depending upon the direction of movement of the detected vehicle. A phase discrimination circuit generates a warning signal when the two Doppler signals have a predetermined phase relation.

REFERENCES:
patent: 3420572 (1969-01-01), Besland
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3781773 (1973-12-01), Ravas
patent: 4064511 (1977-12-01), Manfanovsky
patent: 4095224 (1978-06-01), Dounce et al.

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