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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.
17
votes
Accepted
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. …
4
votes
Accepted
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. …
2
votes
Timing not authorized for defining the MAPt
The MAPt is defined by the distance 0.7 NM to the ILS DME (ITC): …
12
votes
Accepted
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 …