Method and air traffic control system for selecting best radio signal

An air traffic control system for selecting best radio signal, comprising at least two receivers, a measurement and analysis circuit, and a switching circuit, wherein the respective receivers are connected with the measurement and analysis circuit via corresponding receiving channels and the measurement and analysis circuit is connected with the switching circuit,

• wherein the measurement and analysis circuit is configured to determine a respective latency of the at least two receiving channels;
• wherein the measurement and analysis circuit is capable of setting a time threshold by using the respective latency of the at least two receiving channels, wherein the time threshold determines the time span used for receiving individual radio signals received by the respective receivers such that all radio signals received by all receiving channels are taken into consideration when determining the best quality of the radio signals received since the time threshold is adapted based on the respective latency of the receiving channels determined previously;
• wherein each of the receivers is configured to receive a respective radio signal, and wherein the receiver is configured to forward the respective radio signal received to the measurement and analysis circuit via the respective receiving channel processing the respective radio signal received;
• wherein the measurement and analysis circuit is configured to:
• measure the respective arrival time of these radio signals;
• determine the delay time between these radio signals;
• align these radio signals based on the delay time determined, thereby obtaining at least two aligned signals;
• determine the quality of the at least two aligned signals;
• and
• forward the qualities determined to the switching circuit;
• and
• wherein the switching circuit is configured to switch to the respective receiving channel that processes the respective radio signal with the best quality determined.