RADAR ASSEMBLY – NS1020.07

A change in the observed frequency of a wave, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart. The motion of the source causes a real shift in frequency of the wave, while the motion of the observer produces only an apparent shift in frequency. Also called Doppler shift. Speed sensing Radar uses the principle of Doppler shift to determine the ground speed of the vehicle or other type of equipment. A microwave signal that is transmitted out of the sensor reflects off the target and is received by the sensor. When the target (terrain) is moving relative to the sensor, there is a change in the frequency of the reflected signal (Doppler shift). The ground speed is calculated by measuring the change in frequency.

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