Gravitational deformation and astigmatism of tiltable radio telescopes

Details Gravitational deformation and astigmatism of tiltable radio telescopes Gravitational deformation and astigmatism of tiltable radio telescopes

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975itap...23..689v&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. AP-23, Sept. 1975, p. 689-695.

Computer Science

Performance

4

Astigmatism, Gravitational Effects, Paraboloid Mirrors, Radio Telescopes, Angular Distribution, Homology, Optical Correction Procedure, Reflectors, Weighting Functions, Zenith

Scientific paper

It is noted that when an ideal radio telescope is tilted, it will deform in a homologous way from one paraboloid of revolution to another. Formulas are presented which can be used to determine the deviations from homology occurring in real telescopes and to correct them for both altazimuthal and polar mounts. It is shown that the strong gravitational astigmatism exhibited by conventional telescopes supported at two elevation bearings may be corrected at the secondary mirror, resulting in markedly improved performance. Several of the formulas are checked using the example of the NRAO 140-ft telescope at Green Bank, W. Va. Some improvements are suggested for that telescope which would diminish the deviations from homology by a factor of 2.5.

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