Distance Measuring Equipment In Aircraft

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.

Distance measuring equipment in aircraft.

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. Distance measuring equipment dme is a system that is used in aviation for navigation purposes. The received pulses trigger the dme station to reply. Line of visibility between the aircraft and ground station is required.

Operating frequency range of a dme according to icao annex 10 is from 960 mhz to 1215 mhz. 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. Operational notes on distance measuring equipment 2. An interrogator airborne initiates an exchange by transmitting.

Distance information received from dme equipment is slant range distance and not actual horizontal distance. Identification of distance measuring equipment stations. 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. Aircraft distance measuring equipment receiver system cobham s cdm 451 distance measuring equipment receiver system is an all digital dme.

It s fully compatible with fms systems to. Distance measuring equipment dme requires both ground based and in aircraft equipment. The interrogator in the aircraft transmits interrogating pulses to the dme station on the ground. Civilian aircraft make use of one of the tacan features not originally installed at civilian vor stations distance measuring equipment dme.

You ll usually find dme equipment co located with a vor or ils loc. Navaids like vors and ils systems transmit their navigation signals over vhf. 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. Compare this product remove from comparison tool.

When this occurs the navigation station is known as a vortac station. On the other hand dme is transmitted over uhf. Dmes can also provide groundspeed and time to station readouts by differentiation. 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.