Continuous-wave radar
（重定向自FMCW）
![Transmitter
transmittedenergy
Receiver
backscattered energy,containing much informationabout the backscatterer
Principle of a measurement with a continuous wave radar](/Images/godic/202501/13/Cw_radar2031.png")
![Change of wavelength caused by motion of the source](/Images/godic/202501/13/Doppler_effect_diagrammatic2031.png")
![](/Images/godic/202501/13/Fmcw_prinziple2031.png")
![Sinusoidal FM modulation identifies range by measuring the amount of spectrum spread produced by propagation delay (AM is not used with FMCW).](/Images/godic/202501/13/Amfm3-en-de2031.gif")
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.