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Avtometriya

2016 year, number 4

EFFECT OF THE BEAM PATTERN ON THE QUALITY OF OBJECT IMAGE RECONSTRUCTION IN CIRCULAR APERTURE SYNTHESIS

V. P. Yushchenko, S. A. Litvinenko
Novosibirsk State Technical University, pr. Karla Marksa 20, Novosibirsk 630073
Keywords: синтезированная апертура, траекторный доплеровский сигнал, реконструкция изображения, передаточная функция точки, опорные траекторные сигналы, корреляционная обработка, synthetic aperture, trajectory Doppler signal, image reconstruction, point transfer function, reference trajectory signals, correlation processing

Abstract

This paper studies the problem of the acoustic wave reception sector of a tomograph detector in an aqueous medium, whose solution anticipates the development of a tomograph with a circular aperture synthesis in monochromatic probing. In the theoretical consideration of the problem of object image reconstruction, the transducer beam pattern was assumed to be isotropic in the plane i.e., disk-shaped, with an unlimited circular reception sector, which allows investigation of the internal structure of the object in the plane of the beam pattern disk. The effect of the deviation from isotropy due to the restriction of the acoustic wave reception sector on the results of image reconstruction of a point object is determined by modeling the reconstruction of a point object image from the trajectory Doppler signal received by the detector moving on a circular path around the point object.