Design and implementation of an error-compensating subreflector for the NRAO 12-m radio telescope.

Details Design and implementation of an error-compensating subreflector for the NRAO 12-m radio telescope. Design and implementation of an error-compensating subreflector for the NRAO 12-m radio telescope.

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ieeep..82..756m&link_type=abstract

Proceedings of the IEEE, Vol. 82, p. 756-762

Computer Science

3

Radio Telescopes: Antennas, Radio Telescopes: Accuracies

Scientific paper

This paper describes the measurement of the surface shape of the primary reflector of the NRAO 12-m radio telescope and the use of the measurements to machine the shape of a secondary mirror to compensate for the primary reflector errors. The method known as holography was used with the 38.04-GHz transmitter onboard the geosynchronous Lincoln Experimental Satellite to map the main reflector. The machining of the secondary compensated for the errors in the primary shape, and as a result, at 345 GHz, the axial gain of the instrument was increased by about 50% and the antenna pattern correspondingly improved.

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