Technical Electronics Dictionary
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
'Da', 'Db' to 'Deb', 'Dec' to 'Des', 'Det' to 'Dig',
'Dih' to 'Dis', 'Do' to 'Dru', 'Dry' to 'Dz',
Doppler Effect. The apparent change in frequency or pitch when a sound source moves either
toward or away from a listener. In radar, the change in frequency of a received signal caused by
the relative motion between the radar and the target.
Doppler Frequency. The difference between transmitted and reflected frequencies; caused by the
Doppler effect. The Doppler frequency is shown in the vertical bar in the graph below.
Doppler Shift. The apparent change of frequency caused by the motion of the frequency source (transmitter) relative to the destination (receiver).
Doppler Frequency Shift
Note that the Doppler frequency changes depending on the frequency of the signal and the closing rate or speed of the object, given in speed or knots. Because of the frequency range, this chart is used with Doppler Radar. A knot is equal to 1.151 miles per hour.
Doppler frequency is increased as the two objects close toward one another and decreased as they move away from one another.
