METHOD FOR REMOTE INSPECTION OF TARGET IN MONITORED SPACE Russian patent published in 2011 - IPC G01N22/00 

FIELD: physics.

SUBSTANCE: monitored space is scanned with microwave radiation using two or more elementary microwave emitters. The signal reflected from the monitored space is picked up by one or more parallel detection channels. The picked up signal undergoes coherent processing to obtain maximum intensity values of the restored configuration of scatterers in the monitored area depending on the distance from the elementary emitters to the target and information obtained after processing is displayed by constructing a microwave image corresponding to a three-dimensional surface. A video image of the target is also obtained using two or more video cameras which are synchronised with the microwave emitters. The obtained video image is converted to its digital form and a three-dimensional image of the target is constructed. The three-dimensional video image and the microwave image are transferred into a common coordinate system. The distance l in the common coordinate system between the microwave image and the video image is determined. l<l_o, where l_o is a given threshold value of l, indicates absence of a concealed dielectric object at the target in an amount which exceeds the maximum allowable value. If l>l_o, there is further determination of the presence of cavities in the three-dimensional microwave image in regions where l≥l_o and when the depth h of the cavity is greater than where h_o is the threshold value of h, ε is dielectric permittivity of the sought dielectric object. Presence of a concealed dielectric object at the target is ascertained.

EFFECT: high reliability of determining presence or absence of dielectric objects during concealed inspection, wide range of possible angles of inspection.