A high-speed digital correlator for radio astronomy

Author

Padin, S. ; Clark, T.S. ; Ewing, M.S. ; Finch, R.P. ; Lawrence, R.P. ; Navarro, J. ; Scott, S.L. ; Scoville, N.Z. ; Seelinger, C. ; Seling, T.V.

Author_Institution

Owens Valley Radio Obs., California Inst. of Technol., Big Pine, CA, USA

Volume

42

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

793

Lastpage

798

Abstract

Design details for a high-speed digital cross correlator for the Owens Valley Millimeter Array are presented. The correlator uses ECL gate arrays operating at a 256-MHz clock rate to compute the real cross-correlation function for up to four independent frequency bands with bandwidths in the range of 2-128 MHz. For each baseline in the array the correlator provides 512 lags, giving a spectral resolution of 2 MHz at the maximum bandwidth. Two-bit digitization is used, and this results in a sensitivity of 0.88 relative to a perfect analog correlator

Keywords

correlators; emitter-coupled logic; logic arrays; radioastronomical techniques; signal processing equipment; 2 to 128 MHz; 256 MHz; ECL gate arrays; Owens Valley Millimeter Array; clock rate; high-speed digital correlator; radio astronomy; real cross-correlation function; two-bit digitisation; Bandwidth; Clocks; Correlators; Fourier transforms; Frequency; Quantization; Radio astronomy; Radio interferometry; Senior members; Telescopes;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.234487

Filename

234487