13 July 2000 Near-spaced small object resolution, extended objects imaging, and detecting the hidden targets
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Abstract
In the first part it is shown the closely spaced small objects, by non- traditional Super-Scanning Locator (SSL), can be resolved with resolution better that by the Rayleigh criterion. Furthermore, one can create the real images (tomograms) of extended objects. Short description of theoretical and experimental research to develop a SSL with antennas performing beam scanning during both the emission and reception of pulses are presented. The reflected signals are received within discrete visibility layers (Vls) formed due to beam scanning during pulses radiation and reception. SSL has a number of advantages in comparison with the conventional locator. The known distribution of Vls in space allows one: to create adaptive systems ensuring reception of the required information wiht the minimum energy expenses; to attain super-resolution of objects (at distances smaller, than required by the Rayleigh criterion). An ultrasonic version of the SSL, working in air, at frequency range by bats and dolphin usage, is described. The experimental results totally confirm the theoretical predictions. For instance, 3 closely spaced small objects (with distances 3 times less than Rayleigh criterion), were resolved. Real contour image of a model of a air place, was received. The ultrasonic version of the SSL, working inside ocean or sea, for creation the autonomous high-resolution underwater vehicles or diver's information system, can be used. In second part the results of theoretical and experimental research to develop the methods and means for detection, observing and 3D images of static and dynamic objects disposed undersea, or inside or behind optically opaque solid media, are presented. The methods for undersea detection and measurements are based on optical refraction, diffraction, and the Talbot effects on the water surface disturbed by ultrasound waves reflected or passed by the object. The possibility of wind direction and velocity measurements, near the ocean surface, by Talbot effect usage are mentioned. The methods for measurement objects, disposed inside or behind optically non-transparent media, on the usage of microwave holographic static or movie camera are based.
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Vera Moiseevna Ginzburg, Vera Moiseevna Ginzburg, } "Near-spaced small object resolution, extended objects imaging, and detecting the hidden targets", Proc. SPIE 4048, Signal and Data Processing of Small Targets 2000, (13 July 2000); doi: 10.1117/12.391968; https://doi.org/10.1117/12.391968
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