Distance Measuring Equipment In Aircraft

Aircraft distance measuring equipment receiver system cobham s cdm 451 distance measuring equipment receiver system is an all digital dme.

Distance measuring equipment in aircraft.

Dme principles of operation the dme will measure the distance in a straight line to the ground beacon the slant range not the distance from a point on the ground vertically below the aircraft ground range. Line of visibility between the aircraft and ground station is required. Dmes can also provide groundspeed and time to station readouts by differentiation. The dme system consists of an interrogator on board an aircraft and a dme station on the ground.

Operating frequency range of a dme according to icao annex 10 is from 960 mhz to 1215 mhz. An interrogator airborne initiates an exchange by transmitting. Civilian aircraft make use of one of the tacan features not originally installed at civilian vor stations distance measuring equipment dme. The received pulses trigger the dme station to reply.

Vor dme vortac ils dme and loc dme facilities are identified by synchronized identifications which are transmitted on a time share basis the vor or localizer portion of the facility is identified by a coded tone modulated at 1020 hz or a combination of code and voice. It s fully compatible with fms systems to. Identification of distance measuring equipment stations. You ll usually find dme equipment co located with a vor or ils loc.

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. Distance measuring equipment dme is a system that is used in aviation for navigation purposes. Compare this product remove from comparison tool. Slant range distance will always be slightly greater than the flight planned distance to a dme station because it also includes the aircraft s height above the station the dme display in an aircraft 6 000 feet directly above a dme transmitter will read one nautical mile.

Distance measuring equipment dme requires both ground based and in aircraft equipment. Distance measuring equipment dme is defined as a combination of ground and airborne equipment which gives a continuous slant range distance from station readout by measuring time lapse of a signal transmitted by the aircraft to the station and responded back. Operational notes on distance measuring equipment 2. Aircraft equipped with tacan equipment will receive distance information from a vortac automatically while aircraft equipped with vor must have a.

The interrogator in the aircraft transmits interrogating pulses to the dme station on the ground. The difference is generally insignificant except that when directly over a beacon. A dme system calculates the distance from the aircraft to the dme unit at the vortac ground station and displays it on the flight deck. Navaids like vors and ils systems transmit their navigation signals over vhf.