Method and apparatus for radar measurement of ball in play

G - Physics – 01 – S

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G01S 13/38 (2006.01) A63B 71/06 (2006.01) G01S 13/87 (2006.01) A63B 43/00 (2006.01)

Patent

CA 2115827

2115827 9304382 PCTABS00020 A system for continuously and precisely measuring the positions of a generally symmetrical object, e.g., a tennis ball, in motion in a predefined three-dimensional region, e.g., a tennis court (300), which transmits multiple radar signals from first, second, and third, spaced antenna devices (200, 202, 204 etc.), respectively, into the three-dimensional region. Multiple return signals are sensed and are compared with the transmitted signals to determine the phases of the return signals, to thereby obtain ambiguous ranges of the object. Ambiguities are removed by using the Chinese Remainder Theorem to obtain less-ambiguous ranges. A mathematical model defining boundaries of the three-dimensional region is completed by placing signal reflector devices (320-325) on various boundary points of the three-dimensional region, and transmitting the radar signals when the object is not in the three-dimensional region. Further, the return signals are processed to obtain an initial survey of the region and then to periodically resurvey the region, for calibration of the system.

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