Fm-cw radar

From Glossary of Meteorology

FM–CW radar

(Frequency-modulated, continuous-wave radar.) A radar that transmits a waveform that is continuously and regularly modulated in frequency, typically using a linear sweep or sawtooth wave for the frequency modulation.

In such a radar the range to a target is determined by the frequency of the signal it returns. Extremely high range resolution can be achieved by measuring the returned signal in narrow frequency bands.