How the NFL tracks everything on the field but the ball – 2014.10

“Using a pair of location beacons embedded in each player’s shoulder pads, the Zebra system is able to measure speed, acceleration, and distance covered in nearly real-time — there’s just a half-second latency — and to within a margin of error of less than 6 inches. Referees and the first-down measuring sticks along the sideline are also equipped with the coin-sized RFID tags, leaving only the ball as an untracked entity on the field.”


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