# DME.PPT - DISTANCE MEASURING EQUIPMENT PRINCIPLE R Arganda...

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Unformatted text preview: DISTANCE MEASURING EQUIPMENT PRINCIPLE R. Arganda 1 DME PRINCIPLE DME Description Principle Distance Measuring Statute Mile and Nautical Mile Two Types of DME 2 Distance Measuring Equipment Distance Measuring Equipment provides interrogating aircraft with continuos distance information Consists of Airborne Interrogator and Ground Transponder Operates on 1 GHz Band Can Accommodate 100 Aircrafts Simultaneously 3 Principles of Distance Measuring t2 t1 SLANT DISTANCE = (t1+t2) C/2 C = speed of light = 300,000 Km/s = 161987 nautical miles/s DME 4 Nautical and Statute mile 1 statute mile = 1.609 Km 1 nautical mile = 1.852 Km Statute mile A Nautical mile B 5 Types of DME T-DME Low Power Terminal Collocated with ILS DME High Power Enroute Collocated with VOR 6 DME Collocated with VOR 7 En-route DME N 250 degrees “from” the station DME/VOR 100 NM 250 degrees “to” the station 50 NM AZIMUTH 100 NM 150 NM 50 NM 8 DME Collocated with ILS 9 Terminal DME Runway Threshold 25 NM Glide Path 20 NM 15 NM 10 NM GP/DME 10 SUMMARY DME System consists of Interrogator and Transponder. Distance is measured based on the time required to travel to a given point and return. The DME can be collocated with VOR or ILS. 11 ...
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