Diffraction by Finite Irregular Objects
作者： R P Mercier
DOI: 10.1088/0370-1328/77/2/313
关键词: Angular diameter 、 Mathematics 、 Wavelength 、 Geometry 、 Radian 、 Amplitude 、 Correlation function (astronomy) 、 Fresnel integral 、 Diffraction 、 Plane (geometry)
摘要: In this paper a theory is given of statistical correlation in the complex amplitude scalar wave diffracted by an irregular object limited extent. The one-dimensional, and uses Fresnel integral to calculate at receiver. Two well-known results appear as special cases. first function shown be same if infinite plane; basis irregularity measurement ionosphere. second depend upon angular distribution mean power over source. This Michelson method for measuring diameter star. criterion which distinguishes between two cases expressed terms overall size object, size, wavelength distance from object. similar case diffraction cylindrical considered. Here, distinguishing involves only wavelength. An application lunar radio echoes discussed, it concluded that irregularities surface cause phase fluctuations much greater than one radian, these are correlated some 15 metres.
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