FIELD: sportive equipment. SUBSTANCE: apparatus has triboelectric sensors made in the form of isolated wires, which are arranged above ground surface in parallel with marking lines. Signal delivered by sensors is generated under the action of electric charge created during strike of ball against ground surface, when friction between ball and ground surface occurs. All sensors are connected to signal collecting unit connected to signal processor, which detects ball falling place. EFFECT: increased efficiency and precise determination of ball falling place.
