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Features of the active remote sensing of small-sized objects with nonlocal partially coherent reflection


V.D. Popelo – Dr. Sc. (Eng.), Senior Research Scientist, Leading Research Scientist, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh). E-mail: D.K. Proskurin – Ph. D. (Phys.-Math.), Associate Professor, Acting of Rector of Voronezh State Architectural and Structural University. E-mail: A.N. Shmarov – Deputy Head, MESC «Zhukovsky–Gagarin Air Force Academy» (Voronezh)

Among variety of objects of the active optical (laser) location the considerable group falls into to small-sized targets with nonlocal ref-lection. These are the optical and optical-electronic instruments of different function, and also the various reflectors installed on the relative frame and stationary objects for their marking in the conditions of the fissile optical intubation or used in experiments for sto-rage, transfer and procreation of units measures optico-location characteristics. In the course of optico-location supervision they act as small-sized reflectors with high gloss. Bright patches of light of the reflected optical radiation against less strong radiation disseminated by bodies with a rough surface often are the single unmasking sign of the hidden supervision with use of passive optical and optical-electronic instruments. The work purpose – the analysis of features of process of the active optical remote sensing of the objects differing in nonlocal nature of reflection and existence in their optical structure of surfaces with an incoherent scattering, identification of the functional communication of an efficient scattering area of such objects with parameters of elements of their optical structure, definition of correction factors for correction of results of power calculations of a location signal on tracks of the arbitrary extent. The functional model of object with nonlocal reflection is developed. The model relies on fundamental idea of object as about the linear system, includes three basic elements: the phase screen with terminating value of focal distance, one reflector located near the far focal plane of the phase screen and an optical interval between the screen and a surface. The model connects eight parameters. The mathematical model of process of intubation of such objects submitting the formalized description (on the basis of application of methods of the correlative theory of a coherence) transformations of function of a coherence of the second order of radiation at its distribution in system «a source – the route of distribution – object with nonlocal reflection – the route of distribution – a receiving device» is developed. The analytical expression for calculation of an efficient scattering area of object with nonlocal reflection connecting eight parameters of its generalized optical structure is received compliance of the received ratio for a number of the limiting cases is established to the known formulas for calculation of an efficient scattering area of objects of prime structure. Correction factors into «the location equation» for correction of shift of results of calculation of power characteristics of location signals at intubation of objects with nonlocal reflection on tracks which extent is insufficient for formation of a distant zone of the probing and (or) reflected radiation are injected. The physical phenomena leading to such shift are considered and the quantitative assessments of values of correction factors for a number of standard situations are presented.


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