Patent ID: 7847721

Claim:
A decoy for deceiving Doppler radar systems comprising: a corner reflector having a first and a second type of surface, where at least one of the surfaces is of the first type and the rest of the second type, said first type surface being non-reflecting and having a check pattern of electrical lines arranged so close together that when electrically interconnected at crossing points, the check pattern reflects incident radar radiation, and a switching element at each crossing point which electrically connects the lines to provide current flow through the lines when a voltage of a first direction is applied across the pattern of lines and make said first surface reflect radar radiation and which electrically disconnect the lines to prevent current flow through the lines when a voltage of an opposite direction is applied across the pattern of lines to make the first surface not reflect radar radiation, said second type of surface permanently reflecting radar radiation, and a means for applying voltage alternatingly in said first and said opposite direction across the pattern of lines with a modulation frequency to create Doppler sidebands in the reflected radiation of the decoy.