Frequency Modulated Continuous Wave Radar

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FMCW is a Radar which measures both speed and distance of the target object. In CW Radar only speed is measured while in FMCW both speed and distance is measured. This distance measurement is achieved by frequency modulated wave.
There are different frequency modulation waveforms are used such as sawtooth, triangular, square, sine, and stepped modulation. 
Amongst these Sawtooth and Traingular are most widely used to change the frequency of EM wave.

How does it work???

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