The receiver then observes a frequency modulated signal at a rate equal to the frequency of the rotation (rotation tone). ![]() As the receiving antenna approaches the transmitter, the frequency increases and as the antenna recedes from the transmitter, the frequency decreases. ![]() The earliest Doppler direction finding systems used a single antenna placed on a fast rotating turntable. This well known effect describes a difference between the observed and emitted frequency of a wave for an observer which is moving relatively to the source of the waves. Most people associate the Doppler effect with acoustic waves, but the theory is also applicable to radio waves as well. This effect was described by Austrian physicist Christian Doppler in 1842 in Prague. The second technique uses the Doppler effect. ![]() Pseudo-Doppler block diagram 2.2 Doppler Radio Direction Finding System
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