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DME (Distance Measuring Equipment) is, as the name suggests, a system for measuring the slant distance between a suitably-equipped aircraft and a ground-based transponder station; DME stations are often colocated with VOR or ILS installations.

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How can I triangulate a position using two DMEs?

Determination of the points coordinates The DME/DME/Elevation case boils down to: Two DME stations $\small U$ and $\small S$ with known latitudes, longitudes and altitudes ($\small L_U$, $\small \lambda_U … This step checks whether the two DME range spheres intersect. …
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4 votes
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What are the modulation parameters of a DME?

TACAN / VORTAC DME In a TACAN the DME reply pairs from the transponder are also used for bearing determination. … For a separate DME (not part of a TACAN, e.g. VOR-DME) there is no rotating antenna, no NRB/ARB, the signal amplitude is constant. …
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2 votes

Timing not authorized for defining the MAPt

The MAPt is defined by the distance 0.7 NM to the ILS DME (ITC): …
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12 votes
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Are there two navaids on the same frequency close enough to be confused?

Short answer ICAO recommendations include a protection for same-frequency navaids, restricting the received power of undesired stations to a level preventing interferences. To meet this restriction sa …
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