Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1975-12-31
1979-11-27
Caldwell, Sr., John W.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
340 32, G01S 950
Patent
active
041763521
ABSTRACT:
The invention provides an apparatus for deriving information concerning the movement of a road vehicle. In a preferred example a single microwave source is mounted under the vehicle to illuminate the road surface. Two receiving ports are provided, one to receive energy reflected from the illuminated surface to one side of the center line of the vehicle and the other to receive energy reflected from the illuminated surface to the other side of the center line. The two Doppler shifts are determined and compared to determine if there is a difference which indicates that the vehicle is turning, the sign of any difference indicating the direction of turn. One of the Doppler signals is shaped and counted to provide an indication of the speed of the vehicle and one of the Doppler signals is processed to provide an indication of forward or reverse motion.
REFERENCES:
patent: 2855590 (1958-10-01), Gray
patent: 3728630 (1973-04-01), Strenglein
patent: 3757325 (1973-09-01), Sato et al.
patent: 3783445 (1974-01-01), Penwarden
patent: 3787862 (1974-01-01), Jacobson
patent: 3798648 (1974-03-01), Lammers
patent: 3899251 (1975-08-01), Frenk et al.
Caldwell Sr. John W.
Groody James J.
The Marconi Company Limited
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