Continuous-wave radar is a type of radar system where a known stable frequency continuous-wave radio energy is transmitted and then received from any reflecting objects. Continuous-wave (CW) radar uses Doppler, which renders the radar immune to interference from large stationary objects and slow moving clutter. CW radar systems are used at both en...
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http://en.wikipedia.org/wiki/Continuous-wave_radar
(from the article `radar`) ...As previously explained, the Doppler frequency shift of the reflected signal results from the relative motion between the target and the radar. ...
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http://www.britannica.com/eb/a-z/c/135
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