Telescope surface measurement with two feeds

Details Telescope surface measurement with two feeds Telescope surface measurement with two feeds

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978itap...26..857v&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. AP-26, Nov. 1978, p. 857-860.

Physics

2

Antenna Feeds, Error Analysis, Parabolic Reflectors, Radio Telescopes, Surface Geometry, Antenna Design, Coordinate Transformations, Dimensional Measurement, Focal Plane Devices, Focusing, Fourier Transformation, Scanning

Scientific paper

A method is suggested where a reference feed is fixed at the telescope focus, and a second feed has a lateral offset and scans the focal plane. The telescope tracks a celestial radio source, and the receiver measures the phase difference at the two feeds and their (voltage) amplitude ratio. A set of coordinate transformations is applied, after which the surface deviations from a paraboloid can be obtained by a Fourier transform. The measuring error is discussed, and the best wavelength is found to be between 14 and 21 rms times the surface deviations.

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