The Direction Finding technique has existed for as long as electromagnetic waves have been known. It was Heinrich Hertz who in 1888 found out about the directivity of antennas when conducting experiments in the decimetric wave range. A specific application of this discovery for determining the direction of incidence of electromagnetic waves was proposed in 1906 in a patent obtained by Scheller on a homing Direction Finding method.
While direction finding for navigation purposes (referred to as cooperative direction finding) is becoming less important due to the availability of satellite navigation systems, there is a growing requirement for determining the location of emitters as the mobility of communications equipment increases.
Some Areas where Direction Finding can be used are:
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