A radar that records changes in apparent frequency due to the relative motion between the instrument and source. scatterometers on spacecraft are Doppler radars that investigate phenomena contributing to the Earth's changing climate.
Electronics and Electrical Engineering
SeeDoppler effect; radar.
Geology and Earth Sciences
A device that measures the Doppler shift in a radar beam reflected from water droplets on either side of a rotating mesocyclone or tornado. Angular velocity can be calculated from the extent of the red shift on one side and blue shift on the other.