Distance Measuring Equipment

Distance Measuring Equipment - AviatorsBuzz (1)

DME is defined as a combination of ground and airborne equipment which gives a continuous distance-from-station readout by measuring the time-lapse of a signal transmitted by the aircraft to the station and responding back.

  • Usually coupled with a VOR beacon, to enable aircraft to measure their position.
  • Operates on 960 and 1215 MHz, line-of-visibility b/w the aircraft and ground station is required.
  • Provide groundspeed and time-to-station readouts with differentiation.
  • DME was a post-war development based on the identification of friend or foe (IFF) systems and similar principles to secondary radar ranging function.

Distance-Measuring-Equipment-Avaitorsbuzz

Distance measuring equipment (DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz).

Line-of-visibility between the aircraft and ground station is required. An interrogator (airborne) initiates an exchange by transmitting a pulse pair, on an assigned ‘channel’, to the transponder ground station.

The channel assignment specifies the carrier frequency and the spacing between the pulses. After a known delay, the transponder replies by transmitting a pulse pair on a frequency that is offset from the interrogation frequency by 63MHz and having specified separation.

Previous articleSpiceJet, SIA, Air Mauritius Airlift 1000 Plus Oxygen Concentrators To India
Next articleBoeing Puts 737 MAX Deliveries On Hold Due To Electrical Issue
Meet Shivam and Sumit two very enthusiastic avgeeks. They've done their Bachelors of Technology in Aeronautical Engineering and run “A for Aviation”. They’re here with us on AviatorsBuzz, to share their expertise on all things Aviation as their constant motive has always been to share as much knowledge with the aviation community as possible.