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Determination of spin parameters of a sports ball

  • US 8,845,442 B2
  • Filed: 02/28/2006
  • Issued: 09/30/2014
  • Est. Priority Date: 03/03/2005
  • Status: Active Grant
First Claim
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1. A method of estimating a spin frequency of a rotating sports ball in flight, the method comprising:

  • receiving, using a receiver of a radar arrangement, electromagnetic waves reflected from the rotating sports ball;

    deriving from said received electromagnetic waves, via the radar arrangement, a signal having a first frequency corresponding to a velocity of the rotating sports ball, the signal being frequency modulated by a modulation frequency; and

    estimating, via the radar arrangement, at at least a single point in time, the spin frequency of the rotating sports ball based on at least one frequency distance between a harmonic of the modulation frequency and one or more of;

    the first frequency and an additional harmonic of the modulation frequency.

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