Continuous wave (CW) radar systems continuously transmit an illumination signal and simultaneously continuously receive echo reflections scattered from objects. If an illuminated object is stationary, the frequency of the echo signal is unchanged from that transmitted. However, if an object is moving, then the frequency of the echo signal is altered due to the Doppler effect. By detecting this Doppler frequency, the object's motion can be determined. The faster the object moves in a given direction, the larger the Doppler frequency.