US 12,214,257 B2
Method and system for tracking performance of a player
Tuukka Nieminen, Espoo (FI); Jirka Porupudas, Helsinki (FI); and Harri Hohteri, Helsinki (FI)
Assigned to Sstatzz Oy, Helsinki (FI)
Filed by Sstatzz Oy, Helsinki (FI)
Filed on Jul. 29, 2022, as Appl. No. 17/877,030.
Application 17/877,030 is a continuation in part of application No. 16/722,145, filed on Dec. 20, 2019, granted, now 11,435,376.
Application 16/722,145 is a continuation in part of application No. 16/456,089, filed on Jun. 28, 2019, granted, now 11,118,893, issued on Sep. 14, 2021.
Prior Publication US 2022/0387854 A1, Dec. 8, 2022
Int. Cl. A63B 24/00 (2006.01); A63B 43/00 (2006.01); A63B 69/00 (2006.01)
CPC A63B 24/0062 (2013.01) [A63B 24/0021 (2013.01); A63B 43/004 (2013.01); A63B 69/0071 (2013.01); A63B 2024/0031 (2013.01); A63B 2024/0034 (2013.01); A63B 2024/004 (2013.01); A63B 2024/0056 (2013.01); A63B 2209/08 (2013.01); A63B 2220/16 (2013.01); A63B 2220/20 (2013.01); A63B 2220/35 (2013.01); A63B 2220/833 (2013.01); A63B 2225/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for tracking performance of a player, the method comprising:
determining a global direction of a magnetic field at a first court and computing a first court specific data comprising a horizontal direction of a local magnetic field with respect to an x-axis of the global direction of the magnetic field and a vertical direction of the local magnetic field with respect to a local horizontal plane;
providing a rotation for a rotating apparatus about a spin axis via a player, wherein the rotating apparatus comprises an XYZ-magnetic field sensor;
determining that the rotating apparatus is in a ballistic trajectory and activating the XYZ magnetic field sensor;
measuring a plurality of magnetic field values as a function of time with the XYZ-magnetic field sensor when the rotating apparatus is rotating about the spin axis;
computing a magnetic field component of the magnetic field in a direction of a local body coordinate of the spin axis of the rotating apparatus from the measured plurality of magnetic field values;
determining a direction of the spin axis using the computed magnetic field component of the magnetic field and the determined global direction of the magnetic field;
determining a player specific data comprising an angle of the spin axis with respect to the horizontal ground plane and an angle of the shot direction with respect to the horizontal component of spin axis for the player;
calibrating and storing the first court specific data and the player specific data to track the performance of the player at the first court;
determining a global direction of a second magnetic field at a second court and computing a second court specific data comprising a horizontal direction of a local magnetic field with respect to an x-axis of the global direction of the second magnetic field and a vertical direction of the local magnetic field with respect to a local horizontal plane; and
calibrating and storing the second court specific data and the stored player specific data to track the performance of the player at the second court.