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Circular Polarization Ratio

(ratio of circular polarization handedness in reflected radar signal)

The Circular Polarization Ratio of a reflected Radar signal is the ratio of the signal's Polarization in the same direction as the sent signal to the reflected signal's polarization in the opposite direction. It is a measure used in Circular Polarization Radar, radar that sends and receives a Circular Polarized signal, i.e., a signal in which the electric field is constant in amplitude but constantly changes direction in a circle.

Circular Polarization Radar is used for its ability to emphasize and ignore certain wanted or unwanted signals. One use is in detecting water Ice, which has been used in probing the Moon and other astronomical bodies.