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Old 18-03-2019, 21:02   #12
Hugh
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Re: First satellites launched for global internet from space.

Quote:
Originally Posted by RichardCoulter View Post
DF?
Direction Find (and triangulation from a number of different DF sites to precisely locate geographically).

From Britannica
Quote:
Direction finder, or radio direction finder, radio receiver and antenna system for determining the direction of the source of a radio signal. A direction finder (DF) can be used by an aircraft or ship as a navigational aid. This is accomplished by measuring the direction (bearing) of at least two transmitters whose locations are already known. When the measured directions from each transmitter are plotted on a map, the intersection of the two plotted lines gives the location of the aircraft or ship carrying the DF. This technique, using the directions to two or more transmitters of known location, is called triangulation.
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