621.396.962.21 In the approximation of a strongly refractive medium, we solve the inverse problem of subsurfaceradar imaging of buried inhomogeneities using data of multiposition ultra-wideband radio sounding. The fast Fourier transform is used for synthesizing a large aperture with focusing. A mathematical model of the proposed subsurface-imaging system is presented and its accuracy is estimated. The feasibility of the proposed method is confirmed by numerical simulations and model laboratory experiments.
A method is proposed for obtaining 3D radio images by measuring the amplitude of interference of the fields of the reference and object waves by a movable transmitter-receiver module with scanning in a broad frequency band. The results of numerical simulation and experiments with the proposed system of radio vision in the frequency range from 1 to 13 GHz are considered.
Nowadays the problem of remote sensing of various objects and people to prevent transportation and storage of weapons, explosives, and other forbidden objects becomes urgent in connection with strengthening security measures on counteraction to terrorism all over the world. Methods based on x-ray, magnetic induction, and radar sensing are developed intensively. Methods of x-ray sensing, as a rule, are applied to lifeless objects; in some countries, irradiation of people even by low-power x-rays is forbidden. Methods based on application of magnetic fields are suitable for detecting metal objects; however, they are inapplicable for detecting dielectric targets such as explosives or ceramic knifes. Radio-wave methods are relatively safe for people and allow any objects, including dielectric ones, to be detected. For this reason, methods of micro-wave radar sensing are developed intensively all over the world
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