Detecting Concealed Objects Using Electromagnetic Waves

摘要

A device (1) for detecting objects through an obstruction, the device comprising:
€¢ a first detection unit (11) arranged for operating at a first microwave frequency (f 1 ) and producing first detection signals (S 1 ),
€¢ a second detection unit (12) arranged for operating at a second microwave frequency (f 2 ) and producing second detection signals (S 2 ),
€¢ a processing unit (13) for processing the first detection signals (S 1 ) and the second detection signals (S 2 ) so as to detect objects (2),
wherein the first microwave frequency (f 1 ) is chosen so as to penetrate the obstruction while the second microwave frequency (f 2 ) is chosen so as not to penetrate the obstruction, and wherein the processing unit (13) is arranged for ignoring objects (2') which the first detection signals (S 1 ) and the second detection signals (S 2 ) have in common. The detection units (11, 12) are preferably frequency-modulated continuous wave radar units.