2010•Unpublished venueRequires access

Gravity distortion compensation via subreflector motion for 64m shaped Cassegrain antenna

Wei Wang, Guojun Leng, Yimin Wang

Abstract

On the degradation of electrical performance due to the main reflector deformation of large shaped Cassegrain antennas, a method for compensation by moving subreflector is presented. A group of best-fit paraboloids are found by least-square fitting the theoretical discrete data. The group of paraboloids are used to fit the deformed main reflector, with the constraint of all these focuses being in line. The best-fit parameters are optimized and the adjustments of subreflector are derived with the ratio of main reflector and subreflector. The adjustments at various attitudes are saved in a look-up table to real-time compensate for main reflector deformation. From the experimental verification on a 64m reflector antenna, satisfactory results are obtained and will be used in practice.

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Key concepts: Cassegrain reflector, Cassegrain antenna, Reflector (photography), Paraboloid, Compensation (psychology), Optics, Antenna (radio), Deformation (meteorology)