= Doppler radio direction finding
{wiki=Doppler_radio_direction_finding}
Doppler radio direction finding is a technique used to determine the direction of a radio frequency transmission source by analyzing the Doppler effect on the received signal. The Doppler effect refers to the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the waves. In the context of radio direction finding, this effect is used to ascertain the location of a transmitter.
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