Patent ID: 11938375
Assignee: TRACKMAN A/S
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 17:
18. A method for determining a spin axis of a sports ball, comprising:
transmitting a signal, via a first radar, into a target area into which the sports ball is to be launched, the first radar including three receivers arranged so that a minimum of three receivers are not co-linear, the signal being reflected back to the receivers by the sports ball;
receiving, by the first radar, the received reflected signal via the receivers; and
performing a frequency analysis on the received reflected signal received by the first radar and, based on the frequency analysis, calculating a derivative of differences of a time of receipt of signals at the three receivers with respect to frequency and, based on these derivatives, identifying a component of the spin axis of the sports ball based on the determined derivative.