Detection of angular displacement to an object from the moving v

Details Detection of angular displacement to an object from the moving v Detection of angular displacement to an object from the moving v

1977-05-27

1978-08-29

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7UM, 343 9, 343 172R, G01S 902, G01S 944

Patent

active

041107543

ABSTRACT:
A pair of first and second antennas is mounted at the front end of a roadway vehicle. A first sequence of recurring bursts of energy at two different frequencies is transmitted from the first antenna and a second sequence of similar bursts of energy is transmitted from the second antenna at alternate intervals with the bursts of energy transmitted from the first antenna. The signals transmitted from the first and second antennas are reflected from an object and received respectively by the first and second antennas and sampled at appropriate intervals to derive a first set of two Doppler signals from the signal received by the first antenna and a second set of two Doppler signals from the second antenna. The relative phase between the Doppler signals derived from the first antenna and the relative phase between those derived from the second antenna are detected by first and second phase detectors, respectively. The outputs from the phase detectors are subtracted from each other to utilize the difference therebetween as an input data to a microcomputer to determine the angular displacement of the object from the center axis of the vehicle.

REFERENCES:
patent: 3438033 (1969-04-01), Preston
patent: 3889261 (1975-06-01), Sirven

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