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arXiv:1007.4600astro-ph.IM

Surface roughness estimation of a parabolic reflector

Nicolás A. Casco

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Abstract

Random surface deviations in a reflector antenna reduce the aperture efficiency. This communication presents a method for estimating the mean surface deviation of a parabolic reflector from a set of measured points. The proposed method takes into account systematic measurement errors, such as the offset between the origin of reference frame and the vertex of the surface, and the misalignment between the surface rotation axis and the measurement axis. The results will be applied to perform corrections to the surface of one of the 30 m diameter radiotelescopes at the Instituto Argentino de Radioastronomía (IAR).

arXiv comments
4 pages, 3 figures
Journal reference
Boletín de la Asociación Argentina de Astronomía, Vol. 52, pp. 273-276, 2009
DOI
Subjects
astro-ph.IMInstrumentation and Methods for Astrophysics

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  1. Nasa Set to Demonstrate X-Ray Communications in Space 1 comment

    • The gain falls off as the RMS surface roughness becomes a fraction of a wavelength; see figure 1 here: https://arxiv.org/pdf/1007.4600.pdf So it would be interesting to see how that effects it. I suppose a crystal fractured along the lattice for an atomically smooth surface.

      madengrView on HNParent context

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