Goal Line Technology (GLT)

History of Goal Line Technology?

The idea of GLT was born, following several blunders committed by referees in high profile football matches. It became clear how badly the major football matches needed the goal-line technology during the 2010 World Cup in South Africa. Frank Lampard's – of England – goal against Germany was disallowed during a second-round match. This officiating blunder accelerated the adoption of GLTs in major FIFA matches.

What is Goal Line Technology?

The goal-line or goal decision technology is a suite of electronic devices that determines whether the whole of the ball has crossed the goal line or not. This helps the referee in deciding whether to award a score or not.

Types of Goal Line Technology:

Camera Based (Hawk Eye)
Magnetic Field Based (GoalRef)

Camera Based (Hawk eye):

This system uses a network of high-speed video cameras to track a ball’s position at a given time via triangulation. Knowing the ball’s position, Hawk-Eye can tell when it’s crossed the goalmouth, and the software alerts the match officials via a radio transmission to the referee’s watch. Because it can create this kind of visual display it’s expected to be popular among viewers of televised games.

Magnetic Field Based (Goalref):

A passive electronic circuit is embedded into the ball between the leather outer layer and the inflatable center. An electromagnetic field is created in the goalmouth and its strength monitored by computer. When the circuit in the ball crosses the goal line, the electromagnetic field changes, and the computer automatically notifies the referee, again by a radio signal transmitted to his or her watch. Goalref is inexpensive compared to Hawk-Eye, it’s easier to implement at the lower levels of the game.


The information is transmitted within one second which ensures immediate response from the referee. Due to this design there are no stoppages or other forms...

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