The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 1979
Filed:
Dec. 31, 1975
Ronald A Tyler, Chelmsford, GB;
The Marconi Company Limited, Chelmsford, GB;
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.