Airborne or ground station for a radio navigation system and particularly a DME system

摘要

With the increase in air traffic, it has become increasingly important to transmit more information (e.g. addresses, position data, altitude and angle values) between aircraft and ground. This is done by modulating the phase of the carrier wave of DME or TACAN signals, the phase modulation being so chosen in the invention that the predetermined bandwidth of a DME/TACAN channel is not exceeded as a result of the phase modulation. In this way, full compatibility with existing DME or TACAN systems is achieved.