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System and method for determining vehicle ground speed

  • US 4,135,155 A
  • Filed: 09/12/1977
  • Issued: 01/16/1979
  • Est. Priority Date: 09/28/1976
  • Status: Expired due to Term
First Claim
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1. Method to determine the relative speed between a first body (A) and a second body (B) in which a plurality of sensing means (1, 2.1 . . . 2.n) are secured to one of said bodies (A) and located thereon, staggered by fixed distances in the direction of relative movement of said bodies, and responsive to a characteristic of said other body (B);

  • in which sensed characteristic signals are derived from each said sensing means, said sensed signals being time-shifted with respect to each other in accordance with the distance (L) of said sensing means from each other,and comprising, in accordance with the invention, the steps ofgenerating a first sensed characteristic signal (s1) from a sensing means located at the leading portion of said one body (A);

    generating a plurality of second sensed characteristic signals (s2.1 . . . 22.n) which are time shifted with respect to each other from said sensing means located at portions of said body trailing respect to said leading portion;

    time-delaying said first sensed characteristic signal to obtain a delay signal (s1);

    simultaneously comparing said time delayed signal (s1) with each of said generated characteristic signals (s2.1 . . . s2.n) and obtaining an output signal representative of optiimal correlation between said compaired signals;

    and utilizing said correlation output signal to provide an indication representative of relative speed of said bodies (A, B).

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