What does Multilateration (MLAT) use to determine aircraft position?

Multilateration (MLAT) determines an aircraft's position by using measured differences in the times of arrival of energy waves, typically radio signals, from multiple ground stations. This technique is based on the principle of triangulation, where the time it takes for a signal to travel from the aircraft to various receiving stations is analyzed. By calculating the differences in arrival times at these stations, the exact position of the aircraft can be pinpointed.

This method is highly effective for tracking aircraft in situations where other tracking technologies, such as radar, may not be available or as effective. Visual signals from the cockpit and direct communication with pilots do not provide the precise technical means required for multilateration, while weather data inputs do not relate to the positional information needed for tracking aircraft.