Thursday 22 September 2016

PPT PRESENTATION OF GROUND AVIONICS DME

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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