FIELD: sports equipment. SUBSTANCE: apparatus has signal reception devices, commutator, analog-to-digital converter, reception signal processing unit, personal computer, monitor, and emitter. Commutator, analog-to-digital converter and processing unit are connected in series one with another and with personal computer. One output of processing unit is connected to emitter and other output is connected to other input of commutator. Emitter is of supersonic Doppler-type. Apparatus may be used as indicating and detecting device in such events as hockey, football, handball etc. EFFECT: increased efficiency and enhanced reliability in operation. 3 cl, 2 dwg
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