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Racket sport inertial sensor motion tracking analysis

  • US 8,944,940 B2
  • Filed: 02/10/2012
  • Issued: 02/03/2015
  • Est. Priority Date: 08/29/2011
  • Status: Active Grant
First Claim
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1. A motion analysis system for a racket, the system comprising:

  • an inertial sensor coupled to the racket, the inertial sensor comprising an accelerometer array with three degrees of freedom in measurement of acceleration of the racket and a gyro sensor array with three degrees of freedom in measurement of angular rotation of the racket;

    a processor in communication with the inertial sensor, the processor configured to;

    generate time histories describing acceleration and rotation of the racket based on signals from the accelerometer and the gyro sensor arrays;

    identify pulse features in the time histories;

    segment the time histories into individual stroke profiles based on time matching of the pulse features, wherein the acceleration and rotation of the racket define characteristics of the individual stroke profiles;

    generate stroke trajectories based on the individual stroke profiles, the stroke trajectories describing position, velocity and orientation of the racket measured during stroke interactions; and

    determine aerodynamic forces and moments on the racket based on the stroke trajectories; and

    a memory device in communication with the processor, the memory device configured to store the individual stroke profiles;

    wherein the individual stroke profiles are divided into stroke classes based on the corresponding characteristics, the stroke classes defining a stroke repertoire.

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