Goal Ref system in Football
The Goal Ref goal detection system has been developed by the company Fraunhofer IIS. This system is a radio-based system, which uses low-frequency magnetic fields to determine whether or not the whole ball has passed over the goal line. There are two magnetic fields - one in the goal area (using coils attached to the goal), the other is created in and around the ball (using a passive electronic circuit embedded in the ball). The data is processed then transmitted wirelessly to the referee’s wristwatch, and a message is displayed in real time, in addition to a vibrating alert.
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