Patent ID: 7671802

Claim:
A method for tracking sports objects in a playing area, comprising: (a) selecting a first radio receiver group, the first radio receiver group comprising a first subset of at least three radio receivers selected from a totality of radio receivers, the totality of radio receivers distributed about the playing area, wherein each region of the playing area is within a radio reception range of at least three radio receivers; (b) selecting a second radio receiver group, the second radio receiver group comprising a second subset of at least three radio receivers selected from the totality of radio receivers, the second subset being different from the first subset; (c) the first radio receiver group receiving signals from one or more transmitter tags attached to a sports object; (d) the second radio receiver group receiving signals from the one or more transmitter tags attached to the sports object; (e) estimating a position of the sports object in response to the signals received by both the first radio receiver group and the second radio receiver group; and (f) repeatedly performing steps (a)-(e) to track movement of the sports object in the playing area over a time interval.