| Research Abstract |
The aim of this study was to develop a practical system to obtain and analyze soccer playrs' movements during a match, which could be applied to training and conditioning suitable for soccer. The basics of triangular surveying method were adopted in this system. A playr was followed simultaneously by two telescopes equipped with potentiometers. Rotation signals obtained by the potentiometers at every 0.1 sec., were converted to augles. These angles were taken into a personal computer (note book, NEC PC-9821 Ne, i486^<TM>SX33MHz upgraded by a CPU accelerator 100MHz, 12M ram), and calculated to x-y co-ordinates on a plane which is the position of the soccer playr. In this system, the tracks of the playr were calculated and shown in real-time. The raw A-D signal, angle, x-y co-ordinate data were stored in data files. We also developed a program to smooth these angle values, and re-calculate x-y co-ordinates to obtain the distance covered, the movement speed and the movement pattetn.
In this system, it is not necessary for the playrs to wear any marks, which makes it possible to measure during real games. Also the analyzing time is remarkably reduced resulting in the realization of early feedback to the coaches and playrs.
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