ATSEP DME TUTORIAL
The
purpose of Distance Measuring Equipment (DME) is to provide distance
information between a flying aircraft and a DME ground station. The distance is
determined by measuring the propagation delay of a radio frequency (RF) pulse
that is emitted by the aircraft transmitter and returned at a different
frequency by the ground station.
DME
equipped aircraft transmit encoded interrogating RF pulse pairs on the beacon's
receiving channel. The beacon replies with encoded pulse pairs on the airborne
equipment’s receiving channel, which is 63 MHz apart from the beacon’s channel.
The aircraft’s receiver receives and
decodes the transponder’s reply. Then it measures the lapse between the
interrogation and reply and converts this measurement into electrical output
signals. The beacon introduces a fixed delay, called the reply delay, between the reception of
each encoded interrogating pulse pair and the transmission of the corresponding
reply. The interval between the interrogation emission and the reply reception
provides the aircraft with the real distance information from the ground
station; this information displays on the cockpit indicator.
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