GOLF BALL SPIN AXIS MEASUREMENT

摘要

Systems, methods and media are provided for golf ball spin axis measurement. In one example, a method comprises detecting a launched golf ball, receiving reflected Doppler signals from the golf ball by a radar device having an array of multiple receiver pairs, demodulating the spin-induced signals from the received signals, determining a time delay between the demodulated signals for the receiver pairs in the array, calculating an average time delay for the multiple receiver pairs, calculating a spin axis of the golf ball from the time delay values, outputting a spin axis value to an external system, and storing the spin axis value in a database.

主权项

1. A method comprising:
detecting a launched golf ball; receiving reflected Doppler signals from the golf ball by a radar device having an array of at least two receiver pairs arranged in respective planes that are perpendicular to each other; demodulating the received Doppler signals from the multiple receivers; determining a time delay between the demodulated received signals for each of the receiver pairs in the array; calculating a spin axis of the golf ball from a ratio of the respective time delay values, the spin axis being calculated relative to a plane in which a first receiver pair of the at least two receiver pairs lies, the spin axis being further calculated directly from the time delays and receiver separation distances by:
PHI=arctan [S1×T1/(S2×T2)],where T1 and T2 are time delays associated with the first receiver pair and a second receiver pair of the at least two receiver pairs, and S1 and S2 are separation distances associated with the first receiver pair and the second receiver pair; outputting a spin axis value to an external system; and storing the spin axis value in a database.