A cross-correlation receiver for radio astronomy employing quadrature channel generation by computed Hilbert transform

Details A cross-correlation receiver for radio astronomy employing quadrature channel generation by computed Hilbert transform A cross-correlation receiver for radio astronomy employing quadrature channel generation by computed Hilbert transform

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rasc...19.1413l&link_type=abstract

Radio Science (ISSN 0048-6604), vol. 19, Sept.-Oct. 1984, p. 1413-1421. Research supported by the Natural Sciences and Engineeri

Statistics

Computation

4

Radio Telescopes, Signal Processing, Cross Correlation, Digital Techniques, Error Analysis, Hilbert Transformation, Interpolation, Minicomputers, Radio Interferometers

Scientific paper

A real-time digital signal processor for an earth rotation synthesis radio telescope is described. The processor accepts 4 MHz baseband signals, quantizes them to three levels, and performs delay equalization, cross correlation, and phase rotation. The inphase cross correlation of the input signals is calculated for 16 values of delay spaced by 62.5 ns. The quadrature correlator output is produced from the inphase output by numerical computation by using a band-limited form of the Hilbert transform. The values of inphase and quadrature visibility at the exact value of delay are derived by interpolation. Errors arising in this signal processing method are investigated and shown to be small in the adopted design. A high-speed, 16-bit microcomputer is employed to allow many of the required operations to be performed in software. The processor produces four complex interferometer outputs simultaneously and is capable of producing ten such outputs. Interferometer visibility records of the radio source 3C66 are presented.

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