Triangulation
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In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to the point from known points.
Measuring the height of a building with an inclinometer
Direction finding
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Direction finding, radio direction finding, or radiogoniometry is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an in
Triangulation
…establish distances, while Liu Hui (c. 263) gives a version of the calculation above, for measuring perpendicular distances to inaccessible places. Direction finding GSM localization…
Radiotriangulation scheme using two direction-finding antennas (A and B)
Direction finding antenna near the city of Lucerne, Switzerland
W.G. Wade of the National Bureau of Standards uses a large multi-loop antenna to perform RDF in this 1919 photo. This is a fairly small unit for the era.
This Royal Navy model is typical of B–T goniometers. The two sets of "field coils" and the rotating "sense coil" are visible.