By L. Beranek

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0 and 180 deg. planes. FIG. 27b. except for planes. Same as Fig. 27a = 90 and 270 deg. ~ However, in order to demonstrate how successfully the bumps were recovered, the results of original and bumped reflectors were used to obtain the final result and to remove the contamination due to the reflector's original imperfection. , Figs. he effects due to the original surface imperfection, struts diffraction, feed misalignments, 42 ·200 •• -100dll 00 . 14 00 .... :'---=-'. 43 X/~ Ie) ld) FIG. 28.

McInnes, and A. J. T. whitaker, "Microwave holographic metrology of large reflector antennas," IEEE Trans. , AP-24 , pp. 295-303, 1976. 49 4. Scott P. F. and M. Ryle, "A rapid method for measuring the figure of a radio telescope reflector," Royal Astronom. Soc. Monthly Notices, vol. 178, pp. 539-545, 1977. 5. Godwin M. , A. J. T. Whitaker, and A. P. Anderson, "Microwave diagnostics of the Chilbol ton 25 m antenna using OTS satellite," in Proc. Inst. Elec. Eng. Int. 232-236. 6. Mayer C. , J. H. Davis, W.

18. Reflector far-field patterns with displaced panel. numbers of simulated far-field data points. It is clear from these results that, in order to resolve the narrow dimension of the panel with an acceptable degree of accuracy, a sufficient amount of far-field data is needed. The numerical simulation has shown that roughly two to four points per smallest dimension is required to properly resolve the panel. 4 XlA FIG. 19. 5. The panel displacement is A/10 which is not recovered. 4 FIG. 20. 5. the panel displacement is A/10 which is recovered.

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